Diagnostic Procedure

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

CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check resistance between ECM terminal 71 and ground. Refer to Wiring Diagram .
  NOTE: It is necessary to use an ohmmeter which can measure more than 10 MΩ
  
  Resistance: Approximately 532 - 588 kΩ [at 20°C (68°F)]
4. Also check harness for short to ground and short to power.
OK or NG
1. OK : GO TO 4.
2. NG : GO TO 2.
CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect knock sensor harness connector.
  
  Fig 1: Disconnecting Knock Sensor Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check harness continuity between ECM terminal 71 and knock sensor terminal 1.
  Refer to Wiring Diagram .
  
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK : GO TO 4.
2. NG : GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F26, F301
- Harness for open or short between ECM and knock sensor
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK KNOCK SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK : GO TO 5.
2. NG : Replace knock sensor.
CHECK GROUND CONNECTIONS
Loosen and retighten two engine ground screws. Refer to "GROUND INSPECTION ".

OK or NG
1. OK : GO TO 6.
2. NG : Repair or replace ground connections.
  
  Fig 2: Checking Engine Ground Connections
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END