Test Description
NOTE:
Test numbers refer to numbers on diagnostic chart.
- If vehicle does not crank with Code P1626 or P1629 stored, problem affects entire theft deterrent system and is not isolated to fuel enable circuit.
- PCM supplies 5 volts to fuel enable input circuit which theft deterrent module pulses to ground when correct key resistance is recognized. This test ensures PCM is supplying 5 volts and circuit is not open or shorted to ground.
- Checks signal from theft deterrent module. DC frequency on circuit should measure approximately 50 hertz.
- Checks for a faulty PCM or intermittent condition by clearing Code P1626 or P1629. Since PCM ignores absence of a fuel enable signal only when Code P1626 or P1629 is stored, vehicle should not start if problem is present and Code P1626 or P1629 has been cleared.