Diagnostic Procedure

CHECK POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect EGR temperature sensor harness connector.
3. Turn ignition switch ON.
  
  Fig 1: Disconnecting EGR Temperature Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between terminal 1 and ground with CONSULT-II or tester.
  Voltage : Approximately 5V
OK or NG
1. OK: GO TO 2.
2. NG: Repair harness or connectors.
Fig 2: Checking Voltage Between Terminal And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between EGR temperature sensor terminal 2 and engine ground.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 3.
DETECT MALFUNCTIONING PART
Check the harness for open or short between EGR temperature sensor and ECM.
1. 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
1. OK: GO TO 5.
2. NG: Replace EGR temperature sensor.
CHECK INTERMITTENT INCIDENT
Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. : INSPECTION END.