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1997 Malibu DTC P1652

Have had long time problem w/fans not coming on in my 97 Malibu 3.1 v6. Followed suggestions here, relays tested good, motors good...decided to bypass w/switch to run fan manually..it works, but keeps setting P1652...Wired switch into lead wire of fan2, power direct from battery..What GETS me? If the PCM is SMART enough to catch the change in voltage in this circuit, WHY CANT IT KNOW ENGINE IS TOO HOT & TURN ON THE DARN FANS?!?! I love my car, but this is getting ridiculous!! Note: DID find strange problem w/fuse/relay center BEFORE installing switch...Fan MODE relay 'socket' has 5 pins..polarity is reversed in 2 or more pins...not sure HOW the heck THIS realistically COULD happen? Any suggestions?

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  • Cars & Trucks Master
  • 5,968 Answers

U need a data stream run on car that displays values for a tech to decyfer--code scanners dont cut it--factory equip at a private shop does----like the magicmechanic online--send him this issue

Posted on Nov 20, 2013

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4 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Juan Guillen

  • 373 Answers

SOURCE: 1994 2.2L toyota camry radiator fans do not work

Hi.....

The Normal Temperature Range to the Fan Start is: A/C ON 181 F.
A/C OFF 199 F. When the Engine Reach this Temperature the Fan should start.

OK. Do this simple test.
1---- Start the engine, Desconnect the ECT Switch located on the Radiator,
See if the Fan come ON. If yes, if not go to step #2
Connect the ECT SWITCH and leave the car Running and with a Temperature gage.
See the temperature, if the Temperature go more than 199 F.
Turn the Engine OFF.
Disconnect the ECT sensor and check for Ground at the WHITE/BLACK wire.
If ground exist, Replace the ECT switch.
But if not. Check the wire for any damaged, and the ground at the Front Left Fender.
Repair as need.

2---- check the Fuse link RDI FAN . 30 amp.
Check the Fuse link CDS FAN 30 amp.
Replace if need.
And Return to step # 1.
Check the Radiator fan Relay, Rad fan relay 2 and 3. Replace if need.

Ok. I hope this help on your question.
I can give to you the WIRING DIAGRAM of the Fans, But I need a E-MAIL adress to do that.

Thank you for use fixya....

Posted on Sep 25, 2008

Rob McFarlane

  • 76 Answers

SOURCE: cooling fan relay 1998 neon

on the left(driver's) side of the lower rad support. It's a small flat relay with a plug on the bottom and usually has a blue colored front. held on by two screws. Also, there may be more rad fan relays in the underhood fuse/relay box.
Good luck.
R

Posted on Feb 27, 2009

gypsycat00

Joseph Weisenberger

  • 224 Answers

SOURCE: cooling fan

Yes, it's probably the PCM. I had the same problem, and upon replacing the PCM it started working again. If your cooling sending unit is new, and so many parts of your fan assembly are new, it's probably not receiving the signal from the sending unit. Hope this helps.

Posted on Jul 22, 2009

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1 Answer

Where is the cooling fan switch located on my 2005 malibu 3.5liter v6


Cooling fan switch ? The cooling fans (2) on that motor are controlled by three relays . A coolant temp. sensor gives temp info to the PCM - engine computer .
During high speed operation the PCM supplies the ground path for the cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the cooling fan 2 relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 2 relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the cooling fan S/P relay coil is energized closing the relay contacts and provides battery positive voltage from the cool 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.
The PCM commands Low Speed Fans on under the following conditions:
• Engine coolant temperature exceeds approximately 106°C (223°F).
• When A/C is requested and the ambient temperature is more than 50°C (122°F).
• A/C refrigerant pressure exceeds 1 310 kPa (190 psi).
• After the vehicle is shut off if the engine coolant temperature at key-off is more than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
The PCM commands High Speed Fans on under the following conditions:
• Engine coolant temperature reaches 110°C (230°F).
• A/C refrigerant pressure exceeds 1 655 kPa (240 psi).
• When certain DTCs set .
Watch this video ,it shows how it works !
Relay Driven Dual Cooling Fan Diagnostics

Nov 27, 2016 | 2005 Chevrolet Malibu

1 Answer

Cooling fans won't come on in my 97 Chevy malibu


The PCM controls that activation of the cooling fans. I uses three relays to do this. The configuration of the relays is such that failure of any one of them should not result in total fan failure (one or both would still operate). Try this - with the engine running, turn on the A/C. If the fans work, then your problem is that the coolant temp sensor is not telling the PCM the coolant temperature properly. If they still don't work, then, although it doesn't seem likely, I would have the COOLING FAN RELAY, COOLING FAN RELAY 1, and MODE CONTROL RELAY checked. Reason being that the only other possibilities are the PCM and the circuit wiring itself.

Mar 20, 2015 | 1997 Chevrolet Malibu

1 Answer

Radiator fan not working when car heats up fuses are all good for a 2002 chevrolet malibu


it should be the cooling fan relay not fuse. check to see if fan motor is good . run test wires from battery to fan motor to see if it works. if it works its probably the relay

Aug 09, 2014 | 2002 Chevrolet Malibu

1 Answer

What is this code p1652


P1652 Fan 2 Relay Control Circuit (Except Cadillac & Corvette)/VSS Output Circuit (1996
Corvette)/Powertrain Induced Chassis Pitch Output Circuit (1997- 98 Corvette)/Lift/Drive Output
Circuit (Cadillac)
GM code

Apr 28, 2012 | 1998 Buick LeSabre

1 Answer

I have a 1999 Chevy Malibu. The radiator fan only comes on when the air conditioner is on. If you think it is the relay, how can I test the relay with a multi meter


The radiator fan only comes on when the car is under a load or after its been idling for a while. When you turn the AC on it puts a load on the motor so the radiator fan kicks on to prevent overheating.

Nov 18, 2010 | 1999 Chevrolet Malibu

1 Answer

Troubleshoot 97 olds achieva overheating


REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.IF STILL OVERHEATING CHECK TO SEE COOLANT COMING ON IF NOT CHECK COOLANT FAN FUSE AND RELAY.IF BOTH GOOD.HOTWIRE COOLANT FAN TO SEE IF IT WORKS IF NO REPLACE FAN MOTOR.IF FAN MOTOR RUNS FAN MOTOR WIRE HAS SHORT OR COOLANT TEMPERATURE SENSOR FAULTY.

Aug 20, 2010 | 1997 Oldsmobile Achieva

1 Answer

Code p1652 on a 1996 pontiac grand prix does anyone know what it means the book for computer codes is incomplete


Trouble code P1652 means: Cooling Fan 2 Relay Control Circuit Malfunction

I would start by checking power supply to the cooling fans,making sure the coolant system is full,& using a scn tool to verify the proper operation of the cooling fan system.Here is some info to help you.

The Powertrain Control Module (PCM) controls the operation of the cooling fans. This is accomplished by providing a ground path for the cooling fan relay coils within the PCM. The relay contacts will close and complete the circuit between the fusible link at the battery junction block and the fan motors. Whenever there is a fan ON request both fans will be running.

Power for the fan motors is supplied through a fusible link at the battery junction block. Battery positive voltage is applied to the cooling fan relay contacts and coils. The cooling fan relays are energized when current flows through the relay coils to ground at the PCM. The cooling fan relay #1 control circuit is used for low speed cooling fan operation. The cooling fan relay #1 control circuit and the cooling fan relay #2 and #3 control circuit are both grounded for high speed fan operation. The cooling fan relay control circuits are monitored by the PCM. Before using the Electric Cooling Fans diagnostic tables be sure to perform the Powertrain On-Board Diagnostic System Check. If diagnostic trouble codes P1651 or P1652 are present, use the appropriate DTC diagnostic tables prior to performing Electric Cooling Fans diagnostics.

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 the Powertrain On-Board Diagnostic System check prior to diagnosing the engine cooling fans.The PCM will complete the ground path for cooling fan relay #1 under any of the following conditions:
- When engine coolant temperature exceeds 105°C (221°F)
- When A/C is requested and ambient temperature is greater than 10°C (50°F)
- When A/C refrigerant pressure is greater than 190 psi (2 volts)

For high speed cooling fans operation, the PCM will delay control of the cooling fan #2 and #3 relays for 6 seconds. The 6 second delay ensures that the cooling fan electrical load will not exceed the capacity of the system. The PCM will complete the ground paths for cooling fan relays #1, #2, and #3 under any of the following conditions:
- When engine coolant temperature exceeds 113°C (235°F)
- When A/C refrigerant pressure is greater than 275 psi (2.9 volts)

If a problem that involves the low speed cooling fan relay control circuit (cooling fan relay #1 control) exists, DTC P1651 should set. If the problem affects the high speed cooling fan relay control circuit (cooling fan relay #2 and #3 control), DTC P1652 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 Electric Cooling Fan Diagnosis table. The Electric Cooling Fan Diagnosis table should be used to diagnose the PCM controlled cooling fans only if no DTC is set.
Hope this help to solve your poblem (remember rated and comment this help).

Mar 21, 2010 | 1996 Pontiac Grand Prix

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