Diagnostic Procedure

INSPECTION START
Do you have CONSULT-II?

Yes or No
1. Yes: GO TO 2.
2. No: GO TO 3.
CHECK OVERALL FUNCTION
With CONSULT-II
1. Turn ignition switch ON.
2. Check "START SIGNAL" in "DATA MONITOR" mode with CONSULT-II under the following conditions.
  
  Fig 1: Scan Tool Display - Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END.
2. NG: GO TO 4.
CHECK OVERALL FUNCTION
Without CONSULT-II
1. Turn ignition switch to START.
2. Check voltage between ECM terminal 20 and ground under the following conditions.
  
  Fig 2: Voltage Condition Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between ECM Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END.
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the 7.5A fuse.

OK or NG
1. OK: GO TO 5.
2. NG: Replace 7.5A fuse.
CHECK INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector and 7.5A fuse.
3. Check harness continuity between ECM terminal 20 and fuse block.
  
  Fig 4: Checking Harness Continuity Between ECM Terminal And Fuse Block
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 7.
2. NG: GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M81, F36
- Fuse block (J/B) connector M26
- Harness for open or short between ECM and fuse block
OK or NG
1. OK: GO TO 7.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Perform , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END.