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)
Diagnostic Test
1. DTC IS ACTIVEIgnition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
- Go To 2
No
- 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
Turn the ignition off.
Disconnect the TIPM C2 harness connector.
Disconnect the ECM harness connectors.
Remove the Main Relay.
Connect a jumper wire between cavity B7 and cavity B9 of the Main Relay Connector.
Turn the ignition on.
Measure the voltage of the (K31) Fuel Pump Control circuit in the TIPM harness connector.
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)
No
- Go to 3
3. (K31) FUEL PUMP CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (K31) Fuel Pump Control circuit between the TIPM harness connector and the ECM harness connector.
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)
No
- 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)