P0628-FUEL PUMP CONTROL CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the engine running and battery voltage greater than 10.4 volts.
Set Condition:
The PCM detects that the fuel pump control is shorted low.

Possible Causes

INTERMITTENT DTC

(K31) FUEL PUMP CONTROL CIRCUIT SHORTED TO GROUND

(K31) FUEL PUMP CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

TOTALLY INTEGRATED POWER MODULE (TIPM)

POWERTRAIN CONTROL MODULE (PCM)

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

Diagnostic Test

1.DTC IS ACTIVE

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Is the status Active for this DTC?

Yes

Go to 2

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

2.(K31) FUEL PUMP CONTROL CIRCUIT SHORTED TO GROUND

Is the resistance below 100 ohms?

Yes

Repair the (K31) Fuel Pump Control circuit for a short to ground.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 3

3.(K31) FUEL PUMP CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

Yes

Go to 4

Repair the (K31) Fuel Pump Control circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

4.TOTALLY INTEGRATED POWER MODULE (TIPM)

NOTE: With the TIPM connector disconnected, the PCM should display a Fuel Pump Control circuit open DTC.

Is the status Active for the Fuel Pump Control circuit open DTC?

Yes

Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Go to 5

5.POWERTRAIN CONTROL MODULE (PCM)

Were any problems found?

Yes

Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).

Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE).