Wiggle Test Information For Open/Shorts

- 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 TRD).
- TR4, TR3A, TR2, and TR1 are all open in Overdrive, so overdrive 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 from the Powertrain Control Module (PCM) vehicle harness. If the short is still present, then the PCM has an internal failure, otherwise the failure is in the vehicle harness.