Circuit/System Verification
- Inspect the fuel system for damage or external leaks before proceeding.
- Verify that adequate fuel is in the fuel tank before proceeding.
- Ignition ON, command the fuel pump relay ON with a scan tool. You should hear the fuel pump turn ON and OFF.
- If the fuel pump does not operate, refer to Fuel Pump Electrical Circuit Diagnosis .
- Ignition OFF, all accessories OFF, install the J 34730-1A . Refer to Fuel Pressure Gage Installation and Removal .
- The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
- DO NOT start the engine.
- Ignition ON, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 294-335 kPa (43-49 psi) and remains steady for 5 minutes.
- Operate the vehicle within the conditions of the customers concern while monitoring fuel related parameters with a scan tool.
- If the scan tool parameters do not indicate a lean condition, refer to Symptoms - Engine Controls .
- If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
IMPORTANT:
IMPORTANT: