DTC P0135: Primary HO2S (Sensor 1) Heater Circuit Malfunction
- Reset the ECM/PCM (see page 11-312).
- Start the engine.
Is DTC P0135 indicated?
YES |
- Go to step 3. |
NO |
- Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the primary HO2S (Sensor 1) and at the ECM/PCM. |
- Turn the ignition switch OFF.
- Disconnect the primary HO2S (Sensor 1) 4P connector.
- At the primary HO2S side, measure resistance between the primary HO2S (sensor 1) 4P connector terminals No. 3 and No. 4.
PRIMARY HO2S (SENSOR 1) 4P CONNECTOR
Wire side of female terminals
Is there 10-40 ohms?
YES |
- Go to step 6. |
NO |
- Replace the primary HO2S (Sensor 1). |
| |
- Check for continuity between body ground and the primary HO2S (Sensor 1) 4P connector terminals No. 3 and No. 4 individually.
PRIMARY HO2S (SENSOR 1) 4P CONNECTOR
Wire side of female terminals
Is there continuity?
YES |
- Replace the primary HO2S (Sensor 1). |
NO |
- Go to step 7. |
- Turn the ignition switch ON (II).
- Measure voltage between the primary HO2S (Sensor 1) 4P connector terminal No. 3 and No. 4.
PRIMARY HO2S (SENSOR 1) 4P CONNECTOR
Wire side of female terminals
Is there battery voltage?
YES |
- Go to step 9. |
NO |
- Go to step 12. |
- Turn the ignition switch OFF.
- Disconnect ECM/PCM connector A (31P).
|