DH7 - Check TP Circuit For Shorts to VREF or VPWR

- Key Off.

- TP sensor disconnected.

- Disconnect PCM. Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- install breakout box, leave PCM disconnected.

- Measure the resistance between Test Pin 89 (TP SIG) and Test Pins 90 (VREF) and 71 or 97 (VPWR) at the breakout box.

- Is each resistance greater than 10,000 ohms?

YES -- TP SIG is shorted to VREF or VPWR in PCM. REPLACE PCM. REMOVE breakout box. RECONNECT TP sensor. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

NO -- TP SIG is shorted to VREF in the harness. SERVICE short in harness circuit between TP SIG and VREF. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes