2002 mercury sable epc solnoid code p1747 obd ll it said disconnected

Here's a link to your code. P1747 Pressure Control Solenoid Short Circuit Here's a link to the part you need Donald. SAVE 20 ON ONLINE SHIP TO HOME ORDERS OF 100 OR MORE

From what I have read about those 2 error codes you are probably best off taking it to a transmission shop.
You'll find information about the P0743 code here http://www.obd-codes.com/p0743 P0743 is a generic error code for all Ford trucks. The P1747 is specifically for the EPC Solenoid Short Circuit
Electronic Pressure Control (EPC) Solenoid, which is inside the transmission. You have to drain the fluid and open the bottom cover pan. Replace the EPC and the filter at minimum; once you have it open you'll be able to find out more.
Good luck with this, it's not going to be a simple fix.

This code is a trany solenoid failure code that pertains to the epc circuit. When this circuit fails, the vehicle will go to a limp mode or harsh shifting including hesitation and stalling. To check verify when the code appears after the code is reset... use a DVOM and check the voltages going to the epc (electronic pressure control) soleniod. To locate use a wiring diagram so you can locate the epc wires. Once tested, you can verify if the solenoid is working or getting proper voltage signal from the engine computer.

If you decide to replace the epc sensor, make sure the wirings connected to it is not shorting out due to bad insulation or poor routing. In most cases, a defective shorted wire is enough to make the epc solenoid to fail. Note: during the test, make sure the trany is warmed enough since some of these shorted wires will only come out after the vehicle is running for sometime which will cause intermittent flashing of the code. Finally, you can also check the integrity of the wires by tracing it from the trany upto the right module using a wiring diagram. Any DIY person can do this as long as he has the map (wiring diagram) to do it.

Controls the shift points. Replace the EPC. Its on the transmission.

Hi there:
DTC P1747 - Electronic Pressure Control Solenoid - Short circuit.


The EPC (Electronic Pressure Control) solenoid is a variable force solenoid that controls line pressure in the transmission. The EPC solenoid has a feedback circuit in the PCM that monitors EPC current. If the current indicates a short to ground (low pressure), engine torque may be reduced to prevent damage to the transmission.

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Generallry, codes P1746 and P1747 are both related to the EPC electrical circuits. These codes are only generted by and electrical fault. Inspect the wiring connector at the transmission. You may have have to use a mirror to inpsect the connector on the transmission itself. Disconnect both the transmission connector and the pcm connector and check the white/yellow wire (pin 11 at trans connector and pin 81 and PCM) check this wire for an open circuit, shorts to power or ground.
If the wiring checks ok the PCM driver for the epc has failed and the PCM will need to be replaced.

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Thank you for using FixYa, have a nice day.

Codes p1746 and p1747 are both related to the EPC electrical circuits. These codes are only generted by and electrical fault. Inspect the wiring connector at the transmission. You may have have to use a mirror to inpsect the connector on the transmission itself. Disconnect both the transmission connector and the pcm connector and check the white/yellow wire (pin 11 at trans connector and pin 81 and pcm) check this wire for an open circuit, shorts to power or ground. If the wiring checks ok the PCM driver for the epc has failed and the pcm will need to be replaced.

Good luck.

P1746 IS EPC DRIVER CONTROLL FAILURE
P1747 IS EPC CIRCUIT SHORTED OR PCM COULD BE PCM ,,WIRING OR SOLENOID BODY

TO REPLACE SOLENOID BODY,,,,DISCONNECT WIRING HARNESS FROM SOLENOID CONNECTOR THEN DRAIN TRANS FLUID AND REMOVE PAN REMOVE 1 10 MM NUT AND ALL OF THE T30 BOLTS THEN GENTLY PRY DOWN ON SOLENOID ,,,( DON'T TEAR PLATE GASKET BY RAMMING SCREWDRIVER BETWEEN SOLENOID PACK AND TRANNY )... USE CONPRESSED AIR TO CLEAN AROUND SOLENOID CONNECTOR KEEPS DIRT FRON FALLING INTO TRANS.

HOPE THIS HELPS

P1747 * EPC, wiring, PCM EPC solenoid circuit failure, shorted circuit or output driver Voltage through EPC solenoid is checked. An error will be noted if tolerance is exceeded. Short circuit causes minimum EPC pressure (minimum capacity) and limits engine torque (alternate firm). Go To Pinpoint Test
The EPC solenoid is shorted or the electrical circuit (wiring) or the transistor (driver) inside the computer is fried. do you know how to test a computer controlled circuit ?
How to test computer transistor driver without scan tool

Do you know how to find the circuit in question ?

And you are correct about these two codes as being not related . Do you know what evaporative emission system is ?


Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc

The Evaporative Emission Control System (EVAP) is used to prevent gasoline vapors from escaping into the atmosphere from the fuel tank and fuel system. The EVAP system usually requires no maintenance, but faults can turn on the Check Engine light and prevent a vehicle from passing an OBD II plug-in emissions test.
EVAP Evaporative Emission Control System - AA1Car.com
http://www.bbbind.com/free_tsb.html you can find free wiring diagrams here . Do you know how to use a wiring diagram ?

P1451 - EVAP Control System Canister Vent Solenoid Circuit Malfunction Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.

• VPWR circuit open
• CV solenoid circuit shorted to PWR GND or CHASSIS GND
• Damaged CV solenoid
• CV solenoid circuit open
• CV solenoid circuit shorted to VPWR
• Damaged PCM

To verify normal function, monitor the EVAP canister vent solenoid signal PID EVAPCV and the signal voltage (PCM control side). With the valve open, EVAPCV will indicate 0% duty cycle and the voltage approximately equal to battery voltage. When the valve is commanded fully closed, EVAPCV will indicate 100% duty cycle and a voltage drop of 4 volts minimum is normal. Output test mode may be used to switch output ON/OFF to verify function. This is another electrical circuit problem .
Do you know how to use a DVOM - digital volt ohm meter ?
Do you know that P1747 (electronic press control solenoid short circuit) Is a transmission problem . This solenoid controls the fluid pressure .