Inspection Procedure Using OBDII Scan Tool

INSPECTION PROCEDURE

1. Check resistance of Exhaust Gas Recirculation Gas Temperature Sensor.
- Disconnect Exhaust Gas Recirculation Gas Temperature Sensor connector.
- Measure resistance between terminals of Exhaust Gas Recirculation Gas Temperature Sensor connector.

Resistance: 2.5 k ohms or more (Not immediately after driving).

NOTE: If there is short circuit, ohmmeter indicates 200 ohms or less.

- If OK proceed to step 2.
- If not OK replace Exhaust Gas Recirculation Gas Temperature Sensor.
2. Check for short in harness and connector between Exhaust Gas Recirculation Gas Temperature Sensor and Engine Control Module.
- If OK proceed to step 3.
- If not OK repair or replace harness or connector.
3. Check the Vacuum Switching Valve for Exhaust Gas Recirculation.





- Select the active test mode on the LEXUS hand-held tester.
- Check operation of Exhaust Gas Recirculation Vacuum Switching Valve, when it is operated by the LEXUS hand-held tester.

Exhaust Gas Recirculation system is OFF: The air from pipe E is flowing out through the air filter.
Exhaust Gas Recirculation system is ON: The air from pipe E is flowing out pipe G.

- If not OK proceed to step 4.
- If OK Check Exhaust Gas Recirculation Valve.
4. Check operation of the Vacuum Switching Valve for Exhaust Gas Recirculation.
- Remove Exhaust Gas Recirculation Vacuum Switching Valve. Disconnect Exhaust Gas Recirculation Vacuum Switching Valve connector.





- Measure resistance between terminals.

Resistance: 26 - 46 ohms at 20°C (68°F)

- Measure resistance between each terminal and the body.

Resistance: 1 M ohms or higher.

- Check operation of Exhaust Gas Recirculation Vacuum Switching Valve when battery voltage is applied, and not applied to the terminals of Exhaust Gas Recirculation Vacuum Switching Valve connector.

Battery voltage is applied: the air from pipe E flows out through the air filter.
Battery voltage is not applied: the air from pipe E flows out through pipe G.

- If OK proceed to step 5.
- If not OK replace Vacuum Switching Valve for Exhaust Gas Recirculation.
5. Check for open in harness and connector between Junction Box No. 2 and Engine Control Module.
- If OK check and replace Engine Control Module.
- If not OK repair or replace harness or connector.