System Inspection
SYSTEM INSPECTIONHeated Oxygen Sensor Heater (Front)
Using SST-(Monitor, Engine Signal ).
1. Remove the ECM.
2. Connect the special service tools (SST)s to the engine control module (ECM).
3. Turn the ignition switch to ON.
4. Measure the voltage at ECM terminal 4E and 41 by using a voltmeter.
Specification: Below 1.0 V
5. Position the vehicle on a chassis roller and shift the selector lever to D.
6. Increase the engine speed over 4,000 rpm and measure the voltage at ECM terminals 4E and 41 by using a voltmeter.
Specification: Battery positive voltage
7. If not as specified, inspect following.
- ECM terminal 3E voltage (Mass air flow sensor)
- ECM terminal 4AL, 4AH voltage (Crankshaft position sensor)
- Heated oxygen sensor.
Heated Oxygen Sensor Heater (Rear)
1. Remove the ECM.
2. Connect the SSTs to the ECM.
3. Start the engine.
4. Measure the ECM terminal 2F voltage by using a voltmeter.
Specification: Below 1.0 V
5. Position the vehicle on a chassis roller and shift the selector lever to D.
6. Increase the vehicle speed over 80 km/h (50 mile/h) and measure the voltage at ECM terminal 2E
Specification: Battery positive voltage
7. If not as specified, inspect following.
- ECM terminal 10 voltage (Vehicle speed sensor)
- Heated oxygen sensor heater relay