Diagnostic Procedure

DIAGNOSTIC PROCEDURE

1. Check voltage of terminal exhaust gas recirculation 1 to 4.
- If OK proceed to step 5.
- If not OK proceed to step 2.
2. Check voltage of exhaust gas recirculation step motor power source.
- If OK proceed to step 3.
- If not OK check for engine control module power source circuit.
3. Check resistance of exhaust gas recirculation step motor.
- If OK proceed to step 4.
- If not OK replace exhaust gas recirculation step motor.
4. Check for open and short in harness and connector between exhaust gas recirculation step motor and engine control module.
- If OK check and replace engine control module.
- If not OK repair or replace harness or connector.
5. Check operation for exhaust gas recirculation step motor.
- If OK proceed to step 6.
- If not OK replace exhaust gas recirculation step motor.
6. Check resistance of exhaust gas recirculation gas temperature sensor.
- If OK proceed to step 7.
- If not OK replace exhaust gas recirculation gas temperature sensor.
7. Check for open and short in harness and connector between exhaust gas recirculation gas temperature sensor and engine control module.
- If OK check and replace engine control module.
- If not OK repair or replace harness or connector.