Diagnostic Procedure

1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before three way catalyst (manifold).

Fig 1: Checking Exhaust Gas Leak

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OK or NG 

1. OK (With CONSULT-II): GO TO 2.
2. OK (Without CONSULT-II): GO TO  3.
3. NG: Repair or replace.

With CONSULT-II 

1. Warm engine up to normal operating temperature.
2. Disconnect vacuum hose to EGR valve.
3. Check for vacuum existence at idle.

   Vacuum should not exist at idle. 

   Fig 2: Checking For Vacuum

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4. Select "EGRC SOLENOID VALVE" in "ACTIVE TEST" mode with CONSULT-II and turn the solenoid valve ON.
5. Check for vacuum existence when revving engine from idle up to 3, 000 RPM.

   Vacuum should exist when revving engine. 

OK or NG 

1. OK: GO TO  4.
2. NG: GO TO  5.

Fig 3: Reading "EGRC SOLENOID VALVE" In "ACTIVE TEST" Mode

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Without CONSULT-II 

1. Warm engine up to normal operating temperature.
2. Disconnect vacuum hose to EGR valve.
3. Check for vacuum existence at idle.

   Vacuum should not exist at idle. 

4. Check for vacuum existence when revving engine from idle up to 3, 000 RPM quickly.

   Vacuum should exist when revving engine. 

OK or NG 

1. OK: GO TO 4.
2. NG: GO TO  5.

Fig 4: Checking For Vacuum

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Refer to "COMPONENT INSPECTION ".

OK or NG 

1. OK: GO TO  11.
2. NG: Replace EGR valve.

1. Turn ignition switch OFF.
2. Check vacuum hose for clogging, cracks or improper connection.

OK or NG 

1. OK (With CONSULT-II): GO TO 6.
2. OK (Without CONSULT-II): GO TO  7.
3. NG: Repair or replace vacuum hose.

Fig 5: Checking Vacuum Hose For Clogging, Cracks Or Improper Connection

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With CONSULT-II 

1. Turn ignition switch ON.
2. Turn EGRC-solenoid valve "ON" and "OFF" in "ACTIVE TEST" mode with CONSULT-II and check operating sound.

   Clicking noise should be heard. 

OK or NG 

1. OK: GO TO  8.
2. NG: Repair or replace EGRC-solenoid valve or repair circuit.

Fig 6: Reading "ON" And "OFF" In "ACTIVE TEST" Mode

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Without CONSULT-II 

1. Disconnect ECM harness connector.
2. Turn ignition switch ON.
3. Connect a suitable jumper wire between ECM terminal 103 and engine ground.
4. Check operating sound of EGRC-solenoid valve when disconnecting and connecting the jumper wire.

   Clicking noise should be heard. 

OK or NG 

1. OK: GO TO  9.
2. NG: Repair or replace EGRC-solenoid valve or repair circuit.

1. Perform "EGRC-SOLENOID VALVE" in "ACTIVE TEST" mode.
2. Check air passage continuity and operation delay time under the following conditions.

Fig 7: Reading "EGRC SOLENOID VALVE" In "ACTIVE TEST" Mode

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Fig 8: Reference Data

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OK or NG 

1. OK: GO TO  10.
2. NG: Repair EGRC-solenoid valve.

1. Check air passage continuity and operation delay time under the following conditions.

Fig 9: Checking Air Passage Continuity And Operation Delay Time

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Fig 10: Reference Data

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OK or NG 

1. OK: GO TO 10.
2. NG: Repair EGRC-solenoid valve.

Refer to "COMPONENT INSPECTION ".

OK or NG 

1. OK: GO TO 11.
2. NG: Replace EGRC-BPT valve.

Refer to "COMPONENT INSPECTION ".

OK or NG 

1. OK: GO TO 12.
2. NG: Replace EGR temperature sensor.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. : INSPECTION END