9. DTC: P0134, Upper Oxygen Sensor Signal Circuit Trouble (see Table 1-22) (Note: If the trouble of P0135 occurs simultaneously, please remove the trouble of P0135 at first, and then go to the following steps.) Table 1-22 10. DTC: P0135, Upper Oxygen Sensor Heating Circuit Trouble (see Table 1-23) Table 1-23 50 S/N Operation Test Results Actions 1 Connect the diagnostic instrument and adapter, and turn the ignition switch to ON. Next step 2 Start the engine, and keep idle speed until the coolant reaches normal temperature. Check the “oxygen sensor voltage” on the diagnostic instrument, and the voltage should change quickly within 100mV~900mV?
Yes Diagnosis help No Next step 3 Check for open circuit between pin 36#, 18# of the ECU and pin A# (to the grey connection line of the oxygen sensor), B# (to the black connection line of the oxygen sensor) of the sensor with a multimeter. Yes Repair or replace harness No Diagnosis help S/N Operation Test Results Actions 1 Connect the diagnostic instrument and adapter, and turn the ignition switch to ON. Next step 2 Disconnect the oxygen sensor from the harness. Check the voltage between the pin C# (to the white connection line of the oxygen sensor) and the pin D# (to the white connection line of the oxygen sensor) with a multimeter. Is the voltage about 12V?
Yes Next step No Go to step 4 3 Check the resistance between the pin C# (white) and the pin D# (white) of the oxygen sensor with a multimeter. Is the resistance between 1Ω and 6Ω under the temperature of 20℃? Yes Next step No Replace sensor 4 Check the 8A fuse in the oxygen sensor heating circuit. Is the fuse OK? Yes Replace fuse No Next step 5 Check for open circuit, short to power supply or ground between the pin 1# of the ECU, pin 87# of the main relay and the pin C# (to the white connection line of the oxygen sensor) and the pin D# (to the white connection line of the oxygen sensor) of the sensor with a multimeter. Yes Repair or replace harness No Diagnosis help