Visual Inspection
CAUTION:
- Do not disconnect the connector between the NOx sensor control module and NOx sensor. Otherwise, it could adversely affect the NOx sensor control module.
- To prevent a malfunction, do not clean the NOx sensor.
- Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
- Remove the NOx sensor No. 1 or No. 2. (See NOx SENSOR REMOVAL/INSTALLATION .)
- Visually inspect the NOx sensor No. 1 or No. 2 for the following malfunction:
- Damage, cracks, soiling
- Sensor end clogging
- Rusted sensor terminal
- Bent sensor terminal
- Damage to exterior of wiring harness
- If there is any malfunction, repair or replace the NOx sensor No. 1 or No. 2. (See NOx SENSOR REMOVAL/INSTALLATION .)