P127D-FUEL PUMP CONTROL CIRCUIT 2 HIGH (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 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 SHORTED TO BATTERY VOLTAGE
  
FUEL PUMP MOTOR GROUND CIRCUIT
  
FUEL PUMP MOTOR
  
TIPM
  

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



Diagnostic Test

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
  • Go To 2


No

2.(N1) FUEL PUMP CONTROL OUTPUT CIRCUIT SHORTED TO BATTERY VOLTAGE








Does the voltmeter indicate voltage present?

Yes


No
  • Go To 3

3.FUEL PUMP MOTOR GROUND CIRCUIT






NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.



Does the test light illuminate brightly.

Yes
  • Go To 4


No

4.FUEL PUMP MODULE








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

Yes


No
  • Go To 5

5.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


No