Diagnostic Procedure

1. Start engine.
2. Check exhaust pipes and muffler for leaks.
   Fig 1: Checking Exhaust Pipes And Muffler For Leaks

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

• OK: GO TO 2.
• NG: Repair or replace exhaust system.

1. Turn ignition switch OFF.
2. Disconnect EGR volume control valve harness connector.
3. Turn ignition switch ON.
   Fig 2: Disconnecting EGR Volume Control Valve Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between EGR volume control valve terminals 2, 5 and ground with CONSULT-II or tester.

   Voltage: Battery voltage 

OK or NG 

• OK: GO TO  4.
• NG: GO TO 3.
  Fig 3: Checking Voltage Between EGR Volume Control Valve Terminals 2, 5 And Ground

  Courtesy of NISSAN MOTOR CO., U.S.A.

Check the following.

• Harness connectors E20, F32
• IPDM E/R harness connector E122
• Harness for open or short between EGR volume control valve and IPDM E/R

• : Repair open circuit or short to ground or short to power in harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals and EGR volume control valve terminals as follows.

   Refer to WIRING DIAGRAM .

   ECM TERMINALS REFERENCE
   
   

   ECM terminal	EGR volume control valve
   17	6
   18	3
   19	4
   20	1

   Continuity should exist. 

4. Also check harness for short to ground and short to power.

OK or NG 

• OK: GO TO 5.
• NG: Repair open circuit or short to ground or short to power in harness or connectors.

Check EGR passage for clogging and cracks.

OK or NG 

• OK: GO TO 6.
• NG: Repair or replace EGR passage.

Refer to "COMPONENT INSPECTION ".

OK or NG 

• OK: GO TO 7.
• NG: Replace EGR volume control valve.

Perform DTC Confirmation Procedure for DTC P 0405, P0406. Refer to "DTC CONFIRMATION PROCEDURE ".

OK or NG 

• OK: GO TO 8.
• NG: Repair or replace malfunctioning part.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

• : INSPECTION END