DH4 - Check TP Sensor Signal to PCM

- Key Off.

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

- Install breakout box, connect PCM to breakout box.

- Start engine and idle for 2 minutes.

- Slowly open the throttle from closed position, while doing next step.

- Measure the voltage between Test Pin 89 (TP SIG) and Test Pin 91 (SIG RTN) at the breakout box.

- Is the voltage at any time between 0.17 to 0.40 volts?

YES -- TP sensor is damaged. REPLACE TP sensor. REMOVE breakout box. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

NO -- Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

If DTC 1120 is still present, GO to DH8. DH8 - DTC 0122: Generate Opposite DTC 0123