Diagnostic Procedure

CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before three way catalyst (manifold).
Fig 1: Identifying Exhaust Pipe
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK (With CONSULT-II): GO TO 2.
2. OK (Without CONSULT-II): GO TO 3.
3. NG: Repair or replace.
CHECK VACUUM SOURCE TO EGR VALVE
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.
  1. Vacuum should not exist at idle.
  Fig 2: Disconnecting Vacuum Hose To EGR Valve
  Courtesy of NISSAN MOTOR CO., U.S.A.
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, 00rpm.
  1. Vacuum should exist when revving engine.
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 5.
Fig 3: Checking For Vacuum Existence
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK VACUUM SOURCE TO EGR VALVE
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.
  1. Vacuum should not exist at idle.
4. Check for vacuum existence when revving engine from idle up to 3, 00 RPM quickly.
  1. Vacuum should exist when revving engine.
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 5.
Fig 4: Disconnecting Vacuum Hose To EGR Valve
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK EGR VALVE
Refer to Component Inspection .

OK or NG
1. OK: GO TO 11.
2. NG: Replace EGR valve.
CHECK VACUUM HOSE
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 Malfunctions
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK EGRC SOLENOID VALVE OPERATION
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.
  1. 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: Checking EGRC-Solenoid Valve
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK EGRC SOLENOID VALVE OPERATION
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.
  1. Clicking noise should be heard.
OK or NG
1. OK: GO TO 9.
2. NG: Repair or replace EGRC solenoid valve or repair circuit.
CHECK EGRC SOLENOID VALVE
1. Perform "EGRC SOLENOID VALVE" in "ACTIVE TEST" mode.
2. Check air passage continuity and operation delay time under the following conditions.
  
  Fig 7: Checking Air Passage Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 8: Air Passage Condition Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 10.
2. NG: Repair EGRC solenoid valve.
CHECK EGRC SOLENOID VALVE
1. Check air passage continuity and operation delay time under the following conditions.
  
  Fig 9: Air Passage Condition Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 10: Checking Air Passage Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 10.
2. NG: Repair EGRC solenoid valve.
CHECK EGRC-BPT VALVE
Refer to Component Inspection .

OK or NG
1. OK: GO TO 11.
2. NG: Replace EGRC-BPT valve.
CHECK EGR TEMPERATURE SENSOR
Refer to Component Inspection .

OK or NG
1. OK: GO TO 12.
2. NG: Replace EGR temperature sensor.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END.