Diagnostic Aids
WARNING: This page is about a different car, the 2002 Ford Pickup and 2002 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Enter this test only when all steps under QUICK TEST have been successfully completed and engine still does not start or if directed here from another test or chart. This test is only intended to diagnose:
- Fuel rail pressure circuit.
- Compuvalve.
Fuel Absolute Pressure (FAP) sensor is internal to compuvalve. DTCs P0192 and P0193 are set when compuvalve receives an extremely high or low pressure reading of more than 150 psi (CNG) or 60 psi (LPG), or less than one psi (CNG) or 4.9 psi (LPG) from FAP. The FAP is monitored to make sure the ALT fuel regulator is functioning correctly. Possible causes for these faults are:
- FAP sensor circuit open, or shorted to GND or VPWR.
- Damaged FAP sensor or compuvalve.
- Inoperative regulator.
- Inoperative vaporizer (LPG only).
NOTE:
During bi-fuel diagnostics, intermittent failures are possible. Perform wiggle test and tap lightly on relays during testing. Ensure vehicle has LPG before continuing with diagnostics.