Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK ECTS POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature (ECT) sensor harness connector.
3. Turn ignition switch ON.
  
  Fig 1: Locating Engine Coolant Temperature (ECT) Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between ECT sensor terminal 1 and engine ground with CONSULT-II or tester.
  Voltage: Approximately 5V
OK or NG
1. OK: GO TO 3.
2. NG: GO TO 2.
Fig 2: Checking Voltage Between ECT Sensor Terminal 1 And Engine Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between ECM and engine coolant temperature sensor
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between ECT 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 5.
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between ECM and engine coolant temperature sensor
  1. : Repair open circuit or short to power in harness or connectors.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 6.
2. NG: Replace engine coolant temperature sensor.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END