Circuit/System Verification
IMPORTANT:
- 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 and OFF with a scan tool. You should hear the fuel pump turn ON and OFF.
- If the fuel pump does not turn ON, refer to Fuel Pump Electrical Circuit Diagnosis .
- Observe the Actual Fuel Rail Pressure parameter with a scan tool. During engine cranking, the pressure should be at least 415 kPa (60 psi) . With the engine running at idle the pressure should be close to the Desired Fuel Rail Pressure. As the engine speed is increased, the Desired Fuel Rail Pressure and the Actual Fuel Rail Pressure should closely match each other.