TP4 Check TP and SIG Wires to PCM
- Key OFF.
- Disconnect the throttle position sensor connector.
- Install Rotunda Breakout Box 007-00033 or equivalent with Rotunda Breakout Box Adapter 007-00053 (leave the PCM disconnected).
- Measure the resistance of TP wire and SIGRTN wire between BOB Pins and the throttle position sensor connector.
- Measure the resistance between TP BOB Pin 47 and ground.
- Is the resistance less than 5 ohms between BOB Pins and the throttle position sensor connector, and greater than 10,000 ohms between the TP BOB Pin 47 and ground?
YES -- REPLACE the PCM.
NO -- SERVICE the wire(s) in question.