With SST-Engine Signal Monitor

System Inspection
Using SST-(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 the ECM terminal 3D, 3H, 3I and 3M.

Specification:

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


Inspection
Heater
1. Disconnect the heated oxygen sensor connector.

Front HO2S:

Rear HO2S:

2. Measure the resistance between heated oxygen sensor terminals B and C by using an ohmmeter.

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

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