DA12 - Check For Sensor Signal Shorted to VREF

- Key Off.

- Suspect temperature 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 resistance between sensor signal circuit Test Pin 38 (ECT) or 39 (IAT) and VREF at the breakout box.

- Is each resistance greater than 10,000 ohms?

YES -- REPLACE PCM. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

NO -- LOCATE and REPAIR short to VREF. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes