P127E-FUEL PUMP CONTROL CIRCUIT 2 OPEN (TIPM)

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts and the Main relay is on. TIPM requesting Fuel Pump operation.
Set Condition:
Actual Fuel Pump state is not equal to desired state. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes

(N1) FUEL PUMP CONTROL OUTPUT CIRCUIT OPEN

FUEL PUMP

TIPM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE).

1.DTC IS ACTIVE

NOTE: If P0627, P0628 or P0629 has set along with this DTC, diagnose those DTC(s) first before continuing.

Is the status Active for this DTC?

Yes

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.FUEL PUMP MODULE

Does the test light illuminate brightly and flash on and off?

Yes

Replace the Fuel Pump Module in accordance with the Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

3.(N1) FUEL PUMP CONTROL OUTPUT CIRCUIT OPEN

Is the resistance below 5.0 ohms?

Yes

Repair the short to ground in the (N1) Fuel Pump Control Output circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

4.TOTALLY INTEGRATED POWER MODULE

NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Were any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace the Totally Integrated Power Module in accordance with the Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)