P0629-FUEL PUMP CONTROL CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on and the Fuel Pump Relay command on.
Set Condition:
The ECM detects a short circuit on the (K31) Fuel Pump Relay Control circuit for 0.48 seconds.

Possible Causes

INTERMITTENT DTC

(K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE

(K31) FUEL PUMP RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

TOTALLY INTEGRATED POWER MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

1.DTC IS ACTIVE

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.(K31) FUEL PUMP CONTROL CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (K31) Fuel Pump Control circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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

Is the resistance below 10.0 ohms?

Yes

Replace and program the TIPM in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Repair the (K31) Fuel Pump Control circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)