5.
Oxygen sensor (see Table 1-7) Table 1-7 40 Diagnostic Trouble Code (DTC) Trouble Location or Type P0031 Heated oxygen sensor heater control circuit low (front) P0032 Heated oxygen sensor heater control circuit high (front) P0037 Heated oxygen sensor heater control circuit low (rear) P0038 Heated oxygen sensor heater control circuit high (rear) P0130 Oxygen sensor circuit trouble (front) P0131 Oxygen sensor circuit voltage low (front) P0132 Sensor circuit voltage high (front) P0134 Unactivated oxygen sensor (front) P0136 Oxygen sensor circuit trouble (rear) P0137 Oxygen sensor circuit voltage low (rear) P0138 Oxygen sensor circuit voltage high (rear) P0140 Unactivated oxygen sensor (rear) P1166 Oxygen sensor controller self-adaptive trouble diagnosis S/N Operation Test Results Actions 1 Ignition switch in position ON.
Next step 2 Disconnect the oxygen sensor from the harness. Measure the voltage between pin (1) (+) and pin (2) (-) with a multimeter. Is the voltage about 12V? Yes Next step No 4 3 Measure the resistance between pin (1) and pin (2) with a multimeter. Is the resistance between 6k and 25k? Yes Replace ECU No Next step Replace sensor 4 Check the fuse for the oxygen sensor heated circuit. Is the fuse OK? Yes Replace fuse No Next step 5 Check for open or short circuit between pin (1) of the oxygen sensor and the pin J1-02 of the main relay, as well as between pin (2) of the oxygen sensor and the pin J1-61 (front)/J1-64 (rear) of the ECU with a multimeter.
Yes Repair or replace harness No Next step 6 Connect the oxygen sensor, keep neutral position, start the engine, and keep idle speed until the coolant reaches normal temperatue. Next step 7 Disconnect the oxygen sensor from the harness. Measure the voltage between pin (4) (+) and pin (3) (-) with a multimeter. Is the voltage between 0.1V and 0.9V? Yes Next step No Replace sensor 8 Connect an adapter between the ECU and the harness. Check for open or short circuit between pin J1-06, pin J1-62 (front)/ J1-38 (rear) of the ECU and pin (3), pin (4) of the sensor with a multimeter. Yes Repair or replace harness No Replace ECU