Wiggle Test Information For Open/Shorts

Reverse Pressure (RP) Switch Diagnosis Chart





RP Switch Symptoms

A. TR4, TR3A, TR2, and TR1 are all closed in PARK (shorted to signal return), so PARK is a good position to check for intermittent open circuits (with scan tool monitoring TR_D).
B. TR4, TR3A, TR2, and TRI are all open in D5, so D5 is a good position to check for shorts to ground. To determine the shorted components while observing TR_D, unplug the TR and see if the short goes away. If the short is still present unplug the transmission harness and see if the short goes away. If the short is still present, then the short is in the PCM or vehicle harness. Remove the suspect circuit(s) wire terminal from the PCM connector. If the short is still present, then the PCM has an internal failure, otherwise the failure is in the vehicle harness.