H37 - Check For Shorts In the HO2S Heater Harness Circuit

- Key Off.

- Suspect sensors disconnected.

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

- Install breakout box, leave PCM disconnected.

- Use the following chart to measure the resistance between the appropriate test pins at the breakout box.

- DTC 0135 = HO2S HTR-11 Test Pin 93 and Test Pin 71 and 97.
- DTC 0141 = HO2S HTR-12 Test Pin 95 and Test Pin 71 and 97.
- DTC 0155 = HO2S HTR-21 Test Pin 94 and Test Pin 71 and 97.
- DTC 0161 = HO2S HTR-22 Test Pin 91 and Test Pin 71 and 97.

- Is the resistance greater than 10,000 ohms?

YES -- REPLACE PCM. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

NO -- REPAIR shorted wiring in harness. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes