2005 GMC Envoy Logo
Robert Hernandez
Robert Hernandez Posted on Sep 04, 2015
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Fan speed sensor circuit - 2005 GMC Envoy

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Jeff Armer

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  • GMC Master 15,575 Answers
  • Posted on Sep 05, 2015
Jeff Armer
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What fan ? radiator cooling fans or heater fan ? An there is no speed sensor for either , relays or resistor

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I have a 2007 Monte Carlo I'm getting a reading engine hot /A/C not working I did change sensor and still getting the same reading and checked all fuses what else can i do
Take it to a qualified repair shop that has diagnostic information (shop manual ) An has a professional scan tool . Changed what sensor ? Coolant temp ? You don't guess an just replace parts . Doing a full vehicle scan ,checking for DTC'S in all the modules on the vehicle.

ENGINE HOT A/C OFF
Refer to Cooling System Description and Operation
Do the radiator cooling fans work ?
The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a Series/Parallel configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans receive positive voltage from the cooling fan relays which receive battery positive voltage from the underhood fuse block.
During low speed operation, the ECM supplies the ground path for the low speed fan relay, which is Fan 1 Relay, through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the Fan 1 Fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the Series/Parallel relay, which is Fan 2 Relay, and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. The ECM grounds the high speed fan relay, which is Fan 3 Relay and the Series/Parallel relay through the high speed cooling fan relay control circuit. This energizes the Series/Parallel relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized, the relay contacts close to provide battery positive voltage from the Fan 2 Fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
When the requests for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 10 mph. This is to prevent a fan from cycling ON and OFF excessively at idle

DTC P1258: Engine Coolant Overtemperature - Protection Mode Active
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Jul 13, 2019 • 2007 Chevrolet Monte Carlo
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Ford OBD-II Trouble Codes
P1000 OBD-II Monitor Testing Incomplete<br />P1001 KOER Test Cannot Be Completed<br />P1039 Vehicle Speed Signal Missing or Improper<br />P1051 Brake Switch Signal Missing or Improper<br />P1100 Mass Air Flow Sensor Intermittent<br />P1101 Mass Air Flow Sensor out of Self-Test Range<br />P1112 Intake Air Temperature Sensor Intermittent<br />P1116 Engine Coolant Temperature Sensor is out of Self-Test Range<br />P1117 Engine Coolant Temperature Sensor Intermittent<br />P1120 Throttle Position Sensor out of range<br />P1121 Throttle Position Sensor Inconsistent with Mass Air Flow Sensor<br />P1124 Throttle Position Sensor out of Self-Test Range<br />P1125 Throttle Position Sensor Intermittent<br />P1127 Heated Oxygen Sensor Heater not on During KOER Test<br />P1128 Heated Oxygen Sensor Signals reversed<br />P1129 Heated Oxygen Sensor Signals reversed<br />P1130 Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank No. 1<br />P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1<br />P1132 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1<br />P1135 Ignition Switch Signal Missing or Improper<br />P1137 Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1<br />P1138 Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 1<br />P1150 Lack of Upstream Heated Oxygen Sensor Switch - Adaptive Fuel Limit - Bank No. 2<br />P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2<br />P1152 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 2<br />P1157 Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2<br />P1158 Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank No. 2<br />P1220 Series Throttle Control fault<br />P1224 Throttle Position Sensor B out of Self-Test Range<br />P1230 Open Power to Fuel Pump circuit<br />P1231 High Speed Fuel Pump Relay activated<br />P1232 Low Speed Fuel Pump Primary circuit failure<br />P1233 Fuel Pump Driver Module off-line<br />P1234 Fuel Pump Driver Module off-line<br />P1235 Fuel Pump Control out of range<br />P1236 Fuel Pump Control out of range<br />P1237 Fuel Pump Secondary circuit fault<br />P1238 Fuel Pump Secondary circuit fault<br />P1250 Lack of Power to FPRC Solenoid<br />P1260 Theft Detected - Engine Disabled<br />P1270 Engine RPM or Vehicle Speed Limiter Reached<br />P1288 Cylinder Head Temperature Sensor out of Self-Test Range<br />P1289 Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range<br />P1290 Cylinder Head Temperature Sensor Signal Less Than Self-Test Range<br />P1299 Cylinder Head Temperature Sensor Detected Engine Overheating Condition<br />P1309 Misfire Detection Monitor not enabled<br />P1351 Ignition Diagnostic Monitor circuit Input fault<br />P1352 Ignition Coil A - Primary circuit fault<br />P1353 Ignition Coil B - Primary circuit fault<br />P1354 Ignition Coil C - Primary circuit fault<br />P1355 Ignition Coil D - Primary circuit fault<br />P1356 Loss of Ignition Diagnostic Module Input to PCM<br />P1358 Ignition Diagnostic Monitor Signal out of Self-Test Range<br />P1359 Spark Output circuit fault<br />P1364 Ignition Coil Primary circuit fault<br />P1380 VCT Solenoid Valve circuit Short or Open<br />P1381 Cam Timing Advance is excessive<br />P1383 Cam Timing Advance is excessive<br />P1390 Octane Adjust out of Self-Test Range<br />P1400 Differential Pressure Feedback Electronic Sensor circuit Low Voltage<br />P1401 Differential Pressure Feedback Electronic Sensor circuit High Voltage<br />P1403 Differential Pressure Feedback Electronic Sensor Hoses Reversed<br />P1405 Differential Pressure Feedback Electronic Sensor circuit Upstream Hose<br />P1406 Differential Pressure Feedback Electronic Sensor circuit Downstream Hose<br />P1407 EGR No Flow Detected<br />P1408 EGR Flow out of Self-Test Range<br />P1409? EGR Vacuum Regulator circuit malfunction<br />P1409? Electronic Vacuum Regulator Control circuit fault<br />P1410 EGR Barometric Pressure Sensor VREF Voltage<br />P1411 Secondary Air is not being diverted<br />P1413 Secondary Air Injection System Monitor circuit Low Voltage<br />P1414 Secondary Air Injection System Monitor circuit High Voltage<br />P1442 Secondary Air Injection System Monitor circuit High Voltage<br />P1443 Evaporative Emission Control System - Vacuum System - Purge Control Solenoid or Purge Control Valve fault<br />P1444 Purge Flow Sensor circuit Input Low<br />P1445 Purge Flow Sensor circuit Input High<br />P1450 Inability of Evaporative Emission Control System to Bleed Fuel Tank<br />P1451 EVAP Control System Canister Vent Solenoid Circuit Malfunction<br />P1452 Inability of Evaporative Emission Control System to Bleed Fuel Tank<br />P1455 Substantial Leak or Blockage in Evaporative Emission Control System<br />P1460 Wide Open Throttle Air Conditioning Cutoff circuit malfunction<br />P1461 Air Conditioning Pressure Sensor circuit Low Input<br />P1462 Air Conditioning Pressure Sensor circuit high Input<br />P1463 Air Conditioning Pressure Sensor Insufficient Pressure change<br />P1464 ACCS to PCM High During Self-Test<br />P1469 Low Air Conditioning Cycling Period<br />P1473 Fan Secondary High with Fans Off<br />P1474 Low Fan Control Primary circuit<br />P1479 High Fan Control Primary circuit<br />P1480 Fan Secondary Low with Low Fans On<br />P1481 Fan Secondary Low with High Fans On<br />P1483 Power to Cooling Fan Exceeded Normal Draw<br />P1484 Variable Load Control Module Pin 1 Open<br />P1500 Vehicle Speed Sensor Intermittent<br />P1501 Programmable Speedometer & Odometer Module/Vehicle Speed Sensor Intermittent circuit-failure<br />P1502 Invalid or Missing Vehicle Speed Message or Brake Data<br />P1504 Intake Air Control circuit malfunction<br />P1505 Idle Air Control System at Adaptive Clip<br />P1506 Idle Air Control Over Speed Error<br />P1507 Idle Air Control Under Speed Error<br />P1512 Intake Manifold Runner Control Stuck Closed<br />P1513 Intake Manifold Runner Control Stuck Closed<br />P1516 Intake Manifold Runner Control Input Error<br />P1517 Intake Manifold Runner Control Input Error<br />P1518 Intake Manifold Runner Control fault - Stuck Open<br />P1519? Intake Manifold Runner Control Stuck Open<br />P1520? Intake Manifold Runner Control circuit fault<br />P1519? Intake Manifold Runner Control fault - Stuck Closed<br />P1520? Intake Manifold Runner Control fault<br />P1530 Open or Short to A/C Compressor Clutch circuit<br />P1537 Intake Manifold Runner Control Stuck Open<br />P1538 Intake Manifold Runner Control Stuck Open<br />P1539 Power to A/C Compressor Clutch circuit Exceeded Normal Current Draw<br />P1549 Intake Manifold Temperature Valve Vacuum Actuator Connection<br />P1550 Power Steering Pressure Sensor out of Self-Test Range<br />P1605 PCM Keep Alive Memory Test Error<br />P1625 Voltage to Vehicle Load Control Module Fan circuit not detected<br />P1626 Voltage to Vehicle Load Control Module circuit not detected<br />P1650 Power Steering Pressure Switch out of Self-Test Range<br />P1651 Power Steering Pressure Switch Input fault<br />P1700 Transmission system problems<br />P1701 Reverse Engagement Error<br />P1702 Transmission system problems<br />P1703 Brake On/Off Switch out of Self-Test Range<br />P1704 Transmission system problems<br />P1705 Manual Lever Position Sensor out of Self-Test Range<br />P1709 Park or Neutral Position Switch out of Self-Test Range<br />P1710 Transmission system problems<br />P1711 Transmission Fluid Temperature Sensor out of Self-Test Range<br />P1713<br />thru<br />P172 Transmission system problems<br />P1729 4x4 Low Switch Error<br />P1740 Transmission system problems<br />P1741 Torque Converter Clutch Control Error<br />P1742 Torque Converter Clutch Solenoid Faulty<br />P1743 Torque Converter Clutch Solenoid Faulty<br />P1744 Torque Converter Clutch System Stuck in Off Position<br />P1745 Transmission system problems<br />P1746 Electronic Pressure Control Solenoid - Open circuit<br />P1747 Electronic Pressure Control Solenoid - Short circuit<br />P1749 Electronic Pressure Control Solenoid Failed Low<br />P1751 Shift Solenoid No. 1 Performance<br />P1754 Coast Clutch Solenoid circuit malfunction<br />P1756 Shift Solenoid No. 2 Performance<br />P1760 Transmission system problems<br />P1761 Shift Solenoid No. 3 Performance<br />P1762 Transmission system problems<br />P1767 Transmission system problems<br />P1780 Transmission Control Switch circuit is out of Self-Test Range<br />P1781 4x4 Low Switch is out of Self-Test Range<br />P1783 Transmission Over-Temperature Condition<br />P1784 Transmission system problems<br />P1785 Transmission system problems<br />P1786 Transmission system problems<br />P1787 Transmission system problems<br />P1788 Transmission system problems<br />P1789 Transmission system problems<br />P1900 Transmission system problems
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on May 23, 2011 • Ford F Cars & Trucks
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Procedure to diagnose dtc p0526 2005 gmc envoy 4.2L
DTC P0526 Cooling Fan Speed Sensor Circuit

Circuit Description
The powertrain control module (PCM) uses the cooling fan speed signal in order to determine the actual fan speed in relation to the desired fan speed. The PCM uses the cooling fan speed signal in order to reduce the cooling fan noise and in order to maintain the powertrain cooling requirements. The PCM supplies power and ground to the clutch hall effect sensor of the cooling fan clutch. The hall effect sensor returns a signal pulse through the speed signal circuit in response to the reluctor track, which is located inside the fan clutch. If during operation, the PCM detects a loss of the cooling fan speed signal, DTC P0526 will set.


Do you know how to test electrical circuit's ?

Diagnostic Aids
• An inline connector could cause an intermittent DTC. Ensure to test for poor connections and pin retention at all inline connectors. Refer to system schematics for connectors and locations.
• If the condition is not present, refer to Testing for Intermittent Conditions and Poor Connections .
• Disconnect the harness connector of the cooling fan clutch from the shroud. Inspect the exposed wires between the harness connector and the tubing.
• Inspect the cooling fan clutch harness in order to ensure that the clutch supply voltage circuit is not shorted to the following circuits:
- The 5-volt reference circuit
- The cooling fan speed signal circuit
- The low reference circuit
• DTC P0526 will set if the engine is started without the drive belt ON.


Connector End View Reference: Cooling System Connector End Views
1
Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle
2
Turn OFF the ignition.
Disconnect the cooling fan clutch harness connector at the shroud.
Connect a jumper wire between each of the following circuits:
• The 5-volt reference circuit
• The cooling fan speed signal circuit
• The low reference circuit
Measure the voltage of the cooling fan speed sensor circuit and a good ground.
Turn ON the ignition, with the engine OFF.
Manually rotate the cooling fan clutch.
Does the voltage change from 0 to 5 volts?
0-5 V
YES - Go to Step 9
NO - Go to Step 3
3
Disconnect the jumper wires.
Measure the voltage between the 5-volt reference circuit and the low reference circuit of the cooling fan clutch.
Is the voltage measurement near than the specified value?
5 V
YES - Go to Step 6
NO - Go to Step 4
4
Turn OFF the ignition.
Probe the low reference circuit of the cooling fan clutch with a test lamp connected to battery positive voltage.
Does the test lamp illuminate?
--
YES - Go to Step 5
NO - Go to Step 8
5
Test the 5-volt reference circuit of the cooling fan clutch for a high resistance, or for an open. Refer to Circuit Testing and to Wiring Repairs .
Did you find and correct the condition?
--
YES - Go to Step 14
NO - Go to Step 6
6
Test the cooling fan speed signal circuit of the cooling fan clutch for a short to ground, for a high resistance, or for an open. Refer to Circuit Testing and to Wiring Repairs .
Did you find and correct the condition?
--
YES - Go to Step 14
NO - Go to Step 7
7
Test the cooling fan speed signal circuit of the cooling fan clutch for a short to voltage. Refer to Circuit Testing and to Wiring Repairs .
Did you find and correct the condition?
--
YES - Go to Step 14
NO - Go to Step 10
8
Test the low reference circuit of the cooling fan clutch for a high resistance or for an open. Refer to Circuit Testing and to Wiring Repairs .
Did you find and correct the condition?
--
YES - Go to Step 14
NO - Go to Step 11
9
Disconnect the jumper wires.
Test the cooling fan speed signal circuit of the cooling fan clutch for an open. Refer to Circuit Testing and to Wiring Repairs .
Did you find and correct the condition?
--
YES - Go to Step 14
NO - Go to Step 11
10
Inspect for a poor connection at the harness connector of the cooling fan clutch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .
Did you find and correct the condition?
--
Go to Step 14
Go to Step 12
11
Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .
Did you find and correct the condition?
--
Go to Step 14
Go to Step 13
12
Replace the cooling fan clutch. Refer to Fan Clutch Replacement .
Did you complete the replacement?
--
Go to Step 14
--
13
Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
--
Go to Step 14
--
14
Use the scan tool in order to clear the DTCs.
Operate the vehicle within the Conditions for Running in the DTC.
Does the DTC reset?
--
Go to Step 2
System OK
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May 27, 2018 • GMC Cars & Trucks
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Need a wiring diagram of the 2 wires from the temp sending unit that controls the temp gauge and cooling fans on a 99 grand am gt. Need to see where they go They disappear behind the engine
The PCM regulates voltage to the coolant fan relays, which operate the fans. Refer to Engine Controls.

Engine Cooling Fan Description - Electric
The electric cooling fans are used to lower the temperature of the engine coolant flowing through the radiator. They are also used to cool the refrigerant (R-134a) flowing through the A/C condenser.
Operation
The electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is controlled by the PCM. The cooling fan has one speed. The PCM turns the cooling fan ON by grounding the coil of the cooling fan relay when certain conditions are met. When the A/C is requested, the cooling fan will also be turned ON.
Power for the cooling fan motors are supplied through Cool Fan #1 and Cool Fan #2 relays. The cooling fan relays are energized when current flows from the fuses in the Cell 23: Cooling Fan Controls , and through the relay coils to ground through the PCM. The Low Speed fans control circuit is grounded for low speed fans operation. During low speed fans operation, both fans run at a slow speed. The High Speed fans control circuit is grounded for high speed operation. During high speed fans operation, both fans run at high speed.
Important: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. It is important to perform Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans.
If a problem that involves the low speed cooling fan relay control circuit exists, DTC P0480 should set. If the problem affects the high speed cooling fan relay control circuit, DTC P0481 should set. A problem with the ECT sensor should set DTC P0117, P0118, P1114, or P1115. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Cooling Fan Diagnosis tables. The Cooling Fan Diagnosis tables should be used to diagnose the PCM controlled cooling fans only, if a DTC has not set.

The engine coolant temperature (ECT) sensor (3) is a thermistor, a resistor which changes value based on temperature, mounted in the engine coolant stream. Low coolant temperature produces a high resistance (100,000 ohms at -40°C) (-40°F), while high temperature causes low resistance (70 ohms at 130°C) (266°F).
The PCM supplies a 5 volt signal to the ECT sensor through a resistor in the PCM and monitors the terminal voltage. Since this forms a series circuit to ground through the ECT sensor, high sensor resistance (low temperature) will result in high PCM terminal voltage. When the resistance of the ECT sensor is low (high temperature), the terminal voltage will be drawn lower. This terminal voltage indicates engine coolant temperature to the PCM.
A hard fault in the ECT sensor circuit should set either a DTC P0117 or P0118. Remember, these DTCs indicate a malfunction in the engine coolant temperature circuit, so proper use of the DTC table may lead to either repairing a wiring problem or replacing the sensor, to properly repair a problem.

The engine coolant sensor is an input to the PCM , Two wire's both go to the PCM .An the PCM turns on the cooling fans !

DTC P0480 Cooling Fan Relay 1 Control Circuit
DTC P0481Cooling Fan Relay 2 Control Circuit
The Body Control Module (BCM) request the cooling fans. The BCM sends a Class 2 message to the PCM in order to enable the fans based on various inputs. Thebattery voltage travels to all three cooling fan relay coils. The PCM enables cooling fan relay #1 by providing the ground path. The PCM enables cooling fan relays #2 and mode control together by providing a ground path. The left and right cooling fans are connected in series. This will enable both fans on low speed when the fan #1 relay is energized. When all three fan relays are energized, both fans will operate at high speed. The high speed is possible because the fan relays are wired in a parallel circuit. When the PCM detects that certain DTCs are set, the PCM will enable the cooling fans.
The PCM will enable the engine cooling fans when certain Diagnostic Trouble Codes are set.

Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.
1
Did you perform the Instrument Cluster System Check?
--
Go to Step 2
Go to Instrument Cluster System Check
2
Turn the ignition switch to the ON position.
With the scan tool select Instrument Panel Cluster, Special Functions, Instrument Panel Cluster (IPC) gauges.
Perform the Coolant Gauge Sweep Test.
Does the coolant temperature gauge complete a full sweep when commanded?
--
Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls
Go to Step 3
3
Replace the instrument cluster. Refer to Instrument Cluster Replacement .
Did you complete the repair?
--
Go to Instrument Cluster System Check
--

Your best bet would be to take your vehicle to a qualified repair shop that knows how the system works . An has the tools to diagnose the problem .
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Nov 13, 2016 • 1999 Pontiac Grand Am GT
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Error code p1041 and p1047 02 chrysler sebring lxi 2.7L
Definition of Diagnostic Trouble Code P1041 Saab: Injector Cylinder 4 Shorting To Ground

There is no definition for DTC P1047

CodeDescription P1192 Inlet Air Temp. Circuit Low P1193 Inlet Air Temp. Circuit High P1195 1/1 O2 Sensor Slow During Catalyst Monitor P1196 2/1 O2 Sensor Slow During Catalyst Monitor P1197 1/2 O2 Sensor Slow During Catalyst Monitor P1198 Radiator Temperature Sensor Volts Too High P1199 Radiator Temperature Sensor Volts Too Low P1281 Engine Is Cold Too Long P1282 Fuel Pump Relay Control Circuit P1283 Idle Select Signal Invalid P1284 Fuel Injection Pump Battery Voltage Out Of Range P1285 Fuel Injection Pump Controller Always On P1286 Accelerator Pedal Position Sensor Supply Voltage Too High P1287 Fuel Injection Pump Controller Supply Voltage Low P1288 Intake Manifold Short Runner Solenoid Circuit P1289 Manifold Tune Valve Solenoid Circuit P1290 CNG Fuel Pressure Too High P1291 No Temp Rise Seen From Fuel Heaters P1292 CNG Pressure Sensor Voltage Too High P1293 CNG Pressure Sensor Voltage Too Low P1294 Target Idle Not Reached P1295 No 5 Volts To TP Sensor P1296 No 5 Volts To MAP Sensor P1297 No Change in MAP From Start To Run P1298 Lean Operation At wide Open Throttle P1299 Vacuum Leak Found (IAC Fully Seated) P1388 Auto Shutdown (ASD) Relay Control Circuit P1389 No Auto Shutdown (ASD) Relay Output Voltage At PCM P1390 Timing Belt Skipped One Tooth or More P1391 Intermittent Loss of CMP or CKP P1398 Mis-Fire Adapter Numerator at Limit P1399 Wait To Start Lamp Circuit P1403 No 5 Volts To EGR Sensor P1475 Aux. 5 Volt Output Too High P1476 Too Little Secondary Air P1477 Too Much Secondary Air P1478 Battery Temp Sensor Volts Out of Limit P1479 Transmission Fan Relay Circuit P1480 PCV Solenoid Valve P1482 Catalyst Temperature Sensor Circuit Shorted Low P1483 Catalyst Temperature Sensor Circuit Shorted High P1484 Catalytic Converter Overheat Detected P1485 Air Injection Solenoid Circuit P1486 Evap Leak Monitor Pinched Hose P1487 Hi Speed Rad Fan CTRL Relay Circuit P1488 Auxiliary 5 Volt Supply Output Too Low P1489 High Speed Fan CTRL Relay Circuit P1490 Low Speed Fan CTRL Relay Circuit P1491 Rad Fan Control Relay Circuit P1492 Battery Temperature Sensor Voltage Too High P1493 Battery Temperature Sensor Voltage Too Low P1494 Leak Detection Pump Switch or Mechanical Fault P1495 Leak Detection Pump Solenoid Circuit P1496 5 Volt Supply Output Too Low P1498 High speed Rad Fan Ground CTRL Rly Circuit P1594 Charging System Voltage Too High P1595 Speed Control Solenoid Circuits P1596 Speed Control Switch Always High P1597 Speed Control Switch Always Low P1598 A/C Pressure Sensor Volts Too High P1599 A/C Pressure Sensor Volts Too Low P1602 PCM Not Programmed P1680 Clutch Released Switch Circuit P1681 No I/P Cluster CCD/J1850 Messages Received P1682 Charging System Voltage Too Low P1683 Speed Control Power Relay Or Speed Control 12 Volt Driver Circuit P1684 Battery Disconnected Within Last 50 Starts P1685 Skim Invalid Key P1686 No SKIM Bus Message Received P1687 No Cluster Bus Message P1688 Internal Fuel Injection Pump Controller Failure P1689 No Communication Between ECM & Injection Pump Module P1690 Fuel injection pump CKP Sensor Does Not Agree With ECM CKP Sensor P1691 Fuel Injection Pump Controller Calibration Failure P1693 DTC Detected In ECM Or PCM P1694 No CCD Messages Received From ECM P1695 No CCD/J185O Message From BCM P1696 PCM Failure EEPROM Write Denied P1697 PCM Failure SRI Mile Not Stored P1698 No CCD Messages Received From PCM P1719 Skip Shift Solenoid Circuit P1740 TCC Or OD Solenoid Performance P1756 Governor Pressure Not Equal To Target At 15?20 PSI P1757 Governor Pressure Above 3 PSI When Request Is 0 PSI P1762 Governor Pressure Sensor Offset Improper Voltage P1763 Governor Pressure Sensor Voltage Too High P1764 Governor Pressure Sensor Voltage Too Low P1765 Trans 12 Volt Supply Relay Control Circuit P1899 Park/Neutral Position Switch Stuck In Park or In Gear

Read more at: http://www.obd-codes.com/trouble_codes/dodge/
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Jul 26, 2015 • Chrysler Cars & Trucks
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The location of a 2002 chevy cavalier cooling fan sensor
The cooling fan is controlled by the PCM - powertrain control module through a relay ! There is no cooling fan sensor , there is a coolant temperature sensor ! This coolant temperature sensor is an input to the engine computer , if there were a problem wit the sensor the check engine light would be on .
Cooling Fan Control
The engine cooling fan system consists of one cooling fan and one relay. The relay is powered by the battery positive voltage circuit and controlled by a switched ground from the powertrain control module (PCM).
During operation, the PCM supplies the ground path for the cooling fan relay through the cooling fan relay control circuit. This energizes the cooling fan relay coil, closes the relay contacts, and supplies battery positive voltage from the cooling fan fuse through the cooling fan motor supply voltage circuit to the cooling fan. The cooling fan motor is grounded through its own ground circuit.
The PCM commands the fan on under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 106?°C (223?°F).


?€¢
A/C refrigerant pressure exceeds 1310 kPa (190 psi).


?€¢
A/C is requested and vehicle speed is below 100 km/h (62 mph) with A/C pressure above 1413 kPa (205 psi).


?€¢
Vehicle speed is less than 8 km/h (5 mph) for more than 750 seconds. The fan will turn off when vehicle speed is greater than 8 km/h (5 mph) for more than 20 seconds.

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Jun 12, 2015 • 2002 Chevrolet Cavalier
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1answer

A/c blower stop working all speeds, check have power, ground out speed sensor and fan comes on, replaced speed sensor, now fan just works on high when wiggling fan switch, I replaced fan switch, now...
Depending on the year and model, you should have a resistor that controls fan speed. Not sure what a speed sensor is.
On most import cars, the speed is controlled by the ground circuit. If you have power and the fan will run if you ground it, check the fan switch again and the resistor. Then look at the ground for the switch.
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Jul 17, 2012 • Hyundai Santa Fe Cars & Trucks
8helpful
1answer

Where could I find a list of Fault Codes for my 3.3 Litre Voyager?

CHRYSLER OBDII DTC

P1101 HCM/PCM Communication Performance

P1103 Turbocharger Waste Gate Actuator Malfunction

P1104 Turbocharger Waste Gate Solenoid Malfunction

P1105 Fuel Pressure Solenoid Malfunction

P1195 Slow Switching O2 Sensor Bank One Sensor One During catalyst monitoring

P1196 Slow Switching O2 Sensor Bank two Sensor one During catalyst monitoring

P1197 Slow Switching O2 Sensor Bank One Sensor two During catalyst monitoring

P1198 Radiator Temperature Sensor Input voltage too high

P1199 Radiator Temperature Sensor Input voltage too low

P1281 Engine is cold too long

P1282 Fuel Pump Relay control circuit

P1283 Idle select signal invalid

P1284 Fuel Injection pump battery voltage sensor out of range

P1285 Fuel Injection pump controller always on

P1286 Accelerator Position Sensor (APPS) supply voltage too high

P1287 Fuel Injection pump Controller Supply voltage low

P1288 Intake manifold short runner tuning valve solenoid circuit

P1289 Manifold tune valve solenoid circuit

P1290 CNG Fuel system pressure too high

P1291 No Temp rise seen from intake heaters

P1292 CNG Pressure sensor voltage too high

P1293 CNG Pressure sensor voltage too low

P1294 Target idle not reached

P1295 No 5 volts to TP sensor

P1296 No 5 volts to MAP sensor

P1297 No change in MAP sensor from start to run

P1298 lean operation at wide open throttle

P1299 Vacuum Leak detected (IAC fully seated)

P1300 Ignition timing adjustment circuit failure

P1388 Auto shutdown relay control circuit

P1389 No ASD relay output voltage at PCM

P1390 Timing belt skipped one tooth or more

P1391 Intermittent loss of CMP or CKP

P1398 Mis-Fire Adaptive Numerator at Limit (PCM is unable to learn the crank sensors signal

for use in preparation for misfire diagnostics

P1399 Wait to start lamp circuit

P1403 No 5 volt feed to EGR

P1475 Auxiliary 5 volt supply is too high

P1476 Too little secondary air

P1477 Too much secondary air

P1478 Battery Temp Sensor Volts out of limit

P1479 Transmission Fan Relay Circuit

P1480 PCV Solenoid Circuit

P1481 EATX (Electronic Automatic Transaxle) RPM pulse generator performance

P1482 Catalyst Temperature Sensor Circuit shorted low

P1483 Catalyst Temperature Sensor Circuit shorted high

P1484 Catalytic Converter overheat detected

P1485 Air injection solenoid circuit

P1486 EVAP Leak Monitor found a pinched hose

P1487 Hi Speed Fan #2 Circuit

P1488 Auxiliary 5 volt supply output is too low

P1489 High speed fan control relay circuit

P1490 Low speed fan control relay circuit

P1491 Radiator fan relay control circuit

P1492 Ambient/ Battery Temp sensor input voltage too high

P1493 Ambient/ Battery Temp sensor input voltage too low

P1494 Leak detection pump pressure switch or mechanical fault

P1495 Leak detection pump solenoid circuit

P1496 5 volt supply, output too low

P1498 High speed radiator fan ground control relay circuit

P1500 General alternator 'FR' Terminal circuit fault

P1594 Charging system voltage too high

P1595 Speed control solenoid circuits

P1596 Speed control switch always high

P1597 Speed control switch always low

P1598 A/C pressure sensor input voltage too high

P1599 A/C pressure sensor input voltage too low

P1680 Clutch released switch circuit

P1681 No I/P Cluster CCD/ J1850 messages received

P1682 Charging system voltage too low

P1683 Speed control servo power control circuit

P1684 The battery has been disconnected within the last 50 starts

P1685 The SKIM (Smart Key Immobilizer Module) has received an invalid key

P1686 No SKIM (Smart Key Immobilizer Module) bus message received

P1687 No Mechanical Instrument cluster bus message

P1688 Internal Fuel injection pump controller failure

P1689 No communication between the ECM and injection pump module

P1690 Fuel injection pump CKP sensor does not agree with the ECM CKP sensor

P1691 Fuel injection pump controller calibration error

P1692 Fault in companion Engine control module

P1693 A companion DTC was set in both the ECM and PCM

P1694 No CCD message from PCM- Aisin transmission

P1695 No CCD message from body control module

P1696 PCM failure EEPROM write denied

P1697 PCM Failure SRI (Service Reminder Indicator) mileage not stored

P1698 No CCD message from TCM

P1719 Skip shift solenoid circuit

P1740 TCC solenoid or overdrive solenoid performance

P1756 Governor pressure not equal to target at 15-20 psi

P1757 Governor pressure is above 3 PSI when 0 PSI is requested

P1762 Governor pressure sensor offset improper voltage

P1763 Governor pressure sensor voltage to high

P1764 Governor pressure sensor voltage to low
P1765 Transmission 12 volt supply relay control circuit

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Oct 03, 2010 • 1998 Plymouth Voyager
4helpful
1answer

Service engine light is on and code P0526
The Powertrain Control Module (PCM) uses the cooling fan speed signal in order to determine the actual fan speed in relation to the desired fan speed. The PCM uses the cooling fan speed signal in order to reduce the cooling fan noise and in order to maintain the powertrain cooling requirements. The PCM supplies power and ground to the clutch hall effect sensor of the cooling fan clutch. The hall effect sensor returns a signal pulse through the speed signal circuit in response to the reluctor track, which is located inside the fan clutch. If during operation, the PCM detects a loss of the cooling fan speed signal, DTC P0526 will set
  • An inline connector could cause an intermittent DTC. Ensure to test for poor connections and pin retention at all inline connectors. Refer to system schematics for connectors and locations.
  • If the condition is not present, refer to Testing for Intermittent and Poor Connections.
  • Disconnect the harness connector of the cooling fan clutch from the shroud. Inspect the exposed wires between the harness connector and the tubing.
  • Inspect the cooling fan clutch harness in order to ensure that the clutch supply voltage circuit is not shorted to the following circuits:
  • The 5-volt reference circuit.
  • The cooling fan speed signal circuit.
  • The low reference circuit.
  • DTC P0526 will set if the engine is started without the drive belt ON.
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Mar 05, 2010 • 2004 GMC Envoy
13helpful
3answers

Van chevrolet venture 2000
Fifteen minutes! you have bigger problems than only the fans the fans are controlled by a thermo switch that is heated by the coolant, If you have no coolant the sensor cannot activate But fifteen minutes seems like you may have a headgasket problem and steam cannot heat the coolant sensor.OperationNotesThe electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is controlled by the Powertrain Control Module (PCM) . The PCM turns the cooling fan ON by grounding the coil of the cooling fan relays when certain conditions are met. When the A/C is requested, the cooling fan will also be turned ON.

Power for the cooling fan motors are supplied through Maxifuses(R). The cooling fan relays are energized when current flows from the fuses in the Underhood Accessory Wiring Junction Block, and through the relay coils to ground through the PCM. The Coolant Fan 1 Relay Control Circuit is grounded for low speed fans operation. During low speed fans operation, both fans run at a slow speed. The Coolant Fan 1 Relay Control Circuit is grounded for high speed operation. During high speed fans operation, both fans run at high speed.

IMPORTANT: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. Perform the A Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans.

For more information regarding the Charging System, refer to Charging System Description , and Charging System Circuit Description in Starting and Charging.

If a problem that involves the low speed cooling fan relay control circuit exists, DTC P0480 Cooling Fan Relay 1 Control Circuit should set. If the problem affects the high speed cooling fan relay control circuit, DTC P0481 Cooling Fan Relay 2 Control Circuit should set. A problem with the ECT sensor should set DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage, DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage, DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage, DTC P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Electric Cooling Fan Diagnosis.

For more information regarding the Cooling System refer to Engine Cooling Fan Description - Electric, and Cooling System Description in Cooling System.


Here is the electrical schematic and how it all is suppose to work,
If you need any further help please contact me Thank you,Randy If you find this information helpful please give me a good rating

www.aceautomotive1.com
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Aug 16, 2008 • 2000 Chevrolet Venture
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