Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

1. 2
   
   This step determines if the condition is present.
2. 3
   
   If any of the listed DTCs are set, diagnose those DTCs first.
3. 5
   
   This step determines if a Fuel Rail Pressure (FRP) sensor circuit may be the cause of the condition. If a FRP sensor circuit condition exists, the FICM will output zero percent PWM to the PCM. With the FRP sensor disconnected, the fuel rail pressure should slowly rise.
4. 6
   
   This step verifies that the FICM is supplying 5 volts on the FRP sensor reference circuit. An open, or a short to ground, on the 5 volt reference circuit may set this DTC.
5. 7
   
   This step verifies that the FICM is supplying a low reference circuit. An open on the FRP sensor low reference circuit may set this DTC.
6. 8
   
   This step determines if the signal circuit of the FRP sensor is shorted to a voltage. A short to a voltage on the signal circuit of the FRP sensor may set this DTC.
7. 9
   
   This step determines if the signal circuit of the FRP sensor is shorted to ground. A short to ground on the signal circuit of the FRP sensor may set this DTC. The DVOM will display OL If the signal circuit is not grounded.
8. 10
   
   This step verifies that the FICM is supplying the correct output voltage on the FRP output PWM circuit. The open circuit voltage should be 5.0 volts.