Fuel System Diagnosis (FPCM)

Ignition OFF, all accessories OFF, install the CH-48027 - Digital Pressure Gauge.

Ignition ON, engine OFF, command the FPCM Fuel Pump ON with a scan tool. Verify the fuel pressure is between 345-690 kPa (50-100 psi) with the pump running.

Engine idling at the normal operating temperature, Verify the FPCM scan tool Fuel Rail Pressure Sensor parameter is between 296-310 kPa (43-45 psi).

After the fuel pump is turned OFF, verify the fuel pressure stabilizes between 500-599 kPa (72-87 psi).

After the fuel pump is turned OFF, verify the fuel pressure does not decrease more than 34 kPa (5 psi) in 1 minute.