Diagnostic Procedure

CHECK OVERALL FUNCTION

With CONSULT-II

Check "START SIGNAL" in "DATA MONITOR" mode with CONSULT-II under the following conditions.

START SIGNAL CONDITION SPECIFICATION

Condition	START SIGNAL
Ignition switch ON	OFF
Ignition switch START	ON

OK or NG

OK : INSPECTION END
NG : GO TO 4.

Fig 1: CONSULT-II Diagnosis Function Display
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK OVERALL FUNCTION

Without CONSULT-II

Check voltage between ECM terminal 42 and ground under the following conditions.

VOLTAGE CONDITION SPECIFICATION

Condition	Voltage
Ignition switch START	Battery voltage
Other positions	Approximately 0V

OK or NG

OK : INSPECTION END
NG : GO TO 4.

Fig 2: Checking Voltage Between Terminal 42 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

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 TROUBLE SHOOTING .
CHECK FUSE
1. Turn ignition switch OFF.
2. Disconnect 10A fuse.
3. Check if 10A fuse is OK.
OK or NG
1. OK : GO TO 6.
2. NG : Replace 10A fuse.
CHECK START SIGNAL INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Disconnect ignition switch harness connector.
3. Check harness continuity between ECM terminal 42 and ignition switch terminal R. Refer to Wiring Diagram .
  Continuity should exist.
4. 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 M71, F59
- Fuse block (J/B) connectors M3, E30
- Harness for open or short between ignition switch and fuse block (J/B)
- Harness for open or short between ECM and fuse block (J/B)
1. : 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 ".
1. : INSPECTION END