P0629-FUEL PUMP CONTROL CIRCUIT HIGH
 |
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
When the ignition switch is on, the Totally Integrated Power Module (TIPM) sends a 12 Volt signal to the Powertrain Control Module (PCM) on the Fuel Pump Relay Control circuit. The PCM grounds this signal to indicate a request for Fuel Pump operation.
-
When Monitored:
With the ignition on and the Fuel Pump Relay command on.
-
Set Condition:
The PCM detects a short to voltage on the (K31) Fuel Pump Relay Control circuit for 0.5 second.
Possible Causes |
|---|
| (K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Ignition on, engine not running. |
| 2. | With the scan tool, erase DTCs in the PCM. |
| 3. | Crank the engine for no more than 10 seconds if it will not start. |
| 4. | With the scan tool, select View DTCs. |
Is the status Active for this DTC?
Yes
- Go To 2
No
- Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK THE (K31) FUEL PUMP CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
 |
| 1. | Turn the ignition off. |
| 2. | Disconnect the TIPM C1 harness connector. |
| 3. | Disconnect the PCM C2 harness connector. |
| 4. | Remove the ASD Relay from the TIPM. |
| 5. | Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. |
| 6. | Turn the ignition on. |
| 7. | 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 PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace and program the Totally Integrated Power Module in accordance with the service information.
-
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).