Circuit/System Verification
NOTE:
- Inspect the fuel system for damage or external leaks before proceeding.
- Verify that adequate fuel is in the fuel tank before proceeding.
- 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. You should hear the fuel pump turn ON and OFF for 3 -5 seconds.
- If the fuel pump does not operate, refer to FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS .
- Ignition OFF, all accessories OFF, install the J 37287 and J 34730-1A. Refer to FUEL PRESSURE GAGE INSTALLATION AND REMOVAL .
- Ignition ON, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 380-410 kPa (55-60 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 .