P127F-FUEL PUMP CONTROL CIRCUIT 2 OVERCURRENT (TIPM)

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

  With the ignition on. Battery voltage greater than 10.4 volts. TIPM requesting fuel pump operation.

• Set Condition:

  An overcurrent condition is detected in the Fuel Pump control output circuit. One Trip Fault. Three good trips to turn off the MIL.

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

Diagnostic Test

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

• Go To 2

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

NOTE: Make sure that all in-line connectors are inspected for corrosion and/or damage.

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

• Go To 3

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

• Go To 4

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

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

• Go To 5

• Repair the excessive resistance in the (Z904) Fuel Pump Ground circuit.
• Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

• Replace the Fuel Pump.
• Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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