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: Reading "START SIGNAL" In "DATA MONITOR" Mode
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Reference Data
  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

Check voltage between ECM terminal 20 and engine ground under the following conditions.

Fig 3: Checking Voltage Between ECM Terminal 20 And Engine Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 4: Reference Data
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: INSPECTION END
2. NG: GO TO 4.
CHECK STARTING SYSTEM
Turn ignition switch OFF, then turn it to START.

Does starter motor operate?

Yes or No
1. Yes: GO TO 5.
2. No: Refer to "STARTING/CHARGING " in SYSTEM WIRING DIAGRAMS. .
CHECK FUSE
1. Turn ignition switch OFF.
2. Disconnect 7.5A fuse.
3. Check if 7.5A fuse is OK.
OK or NG
1. OK: GO TO 6.
2. NG: Replace 7.5A fuse.
CHECK START SIGNAL INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 20 and fuse block. 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 8.
2. NG: GO TO 7.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M81, F36
- Harness for open or short between ECM and fuse
  : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END