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
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes Diagnosis help
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?
No Next step
Yes
Repair or replace
harness
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.
No Diagnosis help
10. DTC: P0135, Upper Oxygen Sensor Heating Circuit Trouble (see Table 1-23)
Table 1-23
S/N Operation Test Results Actions
1
Connect the diagnostic instrument and adapter, and turn the
ignition switch to ON.
Next step
Yes 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?
No Go to step 4
Yes Next step
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 ?℃
No Replace sensor
Yes Replace fuse
4
Check the 8A fuse in the oxygen sensor heating circuit. Is the
fuse OK?
No Next step
Yes
Repair or replace
harness
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.
No Diagnosis help
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