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:
- FTT sensor.
- FTT and FTT ground (FTT GND) circuits.
- Compuvalve.
Fuel Tank Temperature (FTT) sensor is mounted on alternative fuel tank. As temperature increases, sensor resistance increases. A non-functioning FTT sensor will give a constant reading of 59°F (15°C) if circuit is still intact. FTT is used to calculate fuel gauge reading. DTCs P0187 and P0188 are set if FTT is less than -58°F (-50°C) or more than 140°F (60°C). Possible causes for these faults are:
- FTT sensor circuit open, or shorted to GND or VPWR.
- Damaged FTT sensor.
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.