With SST-Engine Signal Monitor

System Inspection
Using the Special Service Tools (SST)s (Engine Signal Monitor)
1. Remove the ECM.




2. Connect the SSTs to the ECM.
3. Warm up the engine to normal operating temperature.
4. Measure the voltage at ECM terminal 2K, 2L 3C and 3D.

Specification:

5. If not as specified, inspect following.
- Intake-air system
- Fuel system
- On-board diagnosis system
If these systems are OK, replace the heated oxygen sensor.

Heater Inspection
1. Disconnect the heated oxygen sensor connectors.







2. Using an ohmmeter, measure the heater resistance between sensor terminals B and C for each sensor.

Specification: Approx. 6 ohms @ 20°C (68°F)

3. If not as specified, replace the heated oxygen sensor(s).