Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 1: Identifying Ground Screws On Body
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.
CHECK EGR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect EGR temperature sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Identifying EGR Temperature Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between EGR temperature sensor terminal 2 and ground with CONSULT-III or tester.
  Voltage: Approximately 5V
OK or NG

OK: GO TO 3.

NG: Repair or replace harness or connectors.

Fig 3: Checking Voltage Between EGR Temperature Sensor Terminal 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK EGR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between EGR temperature sensor terminal 1 and ECM terminal 67.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 4.

NG: Repair open circuit or short to ground or short to power in harness or connector.
CHECK EGR TEMPERATURE SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 5.

NG: Replace EGR temperature sensor.
CHECK EGR VOLUME CONTROL VALVE
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 6.

NG: Replace EGR volume control valve.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END