1994 Mercury Sable 1994 Mercury Sable, No power to fuel pum

  • 3 POSTS

1994 Mercury Sable 6 cyl Two Wheel Drive Automatic

We are still not getting power to the fuel pump. Here is what we have done so far:
1. Replaced the fuel filter and fuel pump, and checked all connections.
2. Replaced the Integrated Relay Control Module (IRCM)
3. Hooked up a Code Reader to the EEC test plug and received two codes:
542. Fuel Pump secondary circuit fault, and
565. Cannister purge solenoid circuit failure.

Now for my questions.
1. Where is the cannister purge solenoid located?
2. Would the cannister purge solenoid prevent the fuel pump from starting if the solenoid was bad?
3. Is there any other procedure I need to know about, that I can use to further troubleshoot this very annoying problem, without spending a small fortune?
Thanks again for your help.

Do you
have the same problem?
Thursday, June 4th, 2009 AT 7:44 PM

1 Reply

  • 19,433 POSTS

Code 542 A KOEO Code 542 indicates one of the following conditions:
Engine Starts:
Fuel pump secondary circuit shorted to power.
Fuel pump relay contacts always closed.
Open Fuel Pump Monitor (FPM) circuit between PCM and junction to POWER-TO-PUMP circuit.
Left/front HO2S short to power (dual HO2S applications).
Faulty PCM.
No Start:
IFS switch circuit open or not reset.
Open circuit in or between PCM and fuel pump.
Faulty ground connection at fuel pump.
Faulty fuel pump.
If engine starts, go to next step. If engine does not start, go to step 15).
11) Check Fuel Pump Operation Turn ignition on. Wait 5 seconds. Listen for fuel pump operation. If fuel pump is off, go to step 13). If fuel pump is on, go to next step.
12) Check For Fuel Pump Relay Always Closed Turn ignition off. Disconnect fuel pump relay. Turn ignition on. If fuel pump is off with relay disconnected, replace fuel pump relay and repeat QUICK TEST. If fuel pump is on with relay disconnected, repair short to power in POWER-TO-PUMP or FPM circuit. (For models with relay block, also check fuel pump prime plug circuit). Repeat QUICK TEST.
13) Check Continuity Of Fuel Pump Monitor (FPM) Circuit Turn ignition off. Disconnect PCM 60-pin connector. Inspect connector for damaged pins, corrosion and loose wires. Repair as necessary. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Disconnect fuel pump relay. Measure resistance between test pin No. 8 at breakout box and POWER-TO-PUMP circuit at fuel pump relay wiring harness connector. If resistance is less than 5 ohms, go to step 25) (dual HO2S) or replace PCM and repeat QUICK TEST (single HO2S). If resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components, and repeat QUICK TEST.
NOTE:A break in step numbering sequence occurs at this point. Procedure skips from step 13) to step 15). No test procedures have been omitted.

15) Check IFS Switch Turn ignition off. Disconnect fuel pump IFS switch. Ensure switch is reset. Measure resistance of IFS switch. If resistance is less than 5 ohms, check for open in POWER-TO-PUMP circuit, poor fuel pump ground or faulty fuel pump. If resistance is 5 ohms or more, reset or replace IFS switch

Code 565 Code 565 indicates failure in CANP valve. Possible causes for this fault are:
Faulty CANP valve.
Faulty vacuum hoses.
Open or short circuit in wiring harness.
Faulty Powertrain Control Module (PCM).

Canister Purge Solenoid
located In left front corner of engine bay

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Thursday, June 4th, 2009 AT 9:43 PM

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