Circuit/System Verification (ECM)
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, open the hood to disable the Auto-Stop function.
- Ignition ON, verify the scan tool hood position parameter displays Open.
- If the hood position does not display Open, refer to DTC P254F .
- Observe the scan tool DTC information, verify DTCs P0627, P0628, or P0629 are not set.
- If any of the DTCs are set, refer to DTC P0627, P0628, or P0629 .
- Engine idling, observe the scan tool Actual Fuel Rail Pressure parameter. The pressure should be approximately 3.5-5.5 Mpa (508-798 psi).
- Engine idling, the Actual Fuel Rail Pressure should be close to the Desired Fuel Rail Pressure. As the engine speed increases, the Desired Fuel Rail Pressure and the Actual Fuel Rail Pressure should closely match each other.
- Move related harnesses/connectors of the FRP sensor and verify the engine does not stumble, stall, or change engine speed.
- If the engine stumbles, stalls, or changes engine speed. Test or repair the suspected harness or connection.
- Observe the DTC information with a scan tool, DTC P0191 should not set.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.