Diagnostic Procedure

INSPECTION START
Turn ignition switch to START.

Is any cylinder ignited?

Yes or No

YES (With CONSULT-II) : GO TO 2.

Yes (without CONSULT-II) : GO TO 3.

NO : GO TO 6.
CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine.
2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
3. Make sure that each circuit produces a momentary engine speed drop.
  
  Fig 1: Consult-II ACTIVE TEST Display Screen
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK : INSPECTION END

NG : GO TO 6.

CHECK FUNCTION OF FUEL INJECTOR-I

Without CONSULT-II

Turn ignition switch OFF.
Disconnect harness connector F50, F251
Turn ignition switch ON.

Fig 2: Identifying Harness Connector F50, F251
Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between harness connector F50 terminal 5 and ground with CONSULT-II or tester.
Voltage: Battery voltage
Turn ignition switch OFF.
Disconnect ECM harness connector.

Check harness continuity between harness connector F50 and ECM as follows.

Refer to Wiring Diagram.

Fig 3: Identifying Voltage Between Harness Connector Terminal 5 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

ECM AND F50 CONNECTOR TERMINALS

Cylinder	Harness connector F50 terminal	ECM terminal
1	6	23
2	4	42
3	2	22
4	3	41
5	1	21
6	7	40

Continuity should exist.

Also check harness for short to ground and short to power.

OK or NG

OK : GO TO 5.

NG : GO TO 4.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M82, F102
- Fuse block (J/B) connector M1
- 15A fuse
- Harness for open or short between harness connector F50 and fuse
- Harness for open or short between harness connector F50 and ECM
  : Repair open circuit or short to ground or short to power in harness or connectors.

CHECK FUNCTION OF FUEL INJECTOR-II

Provide battery voltage between harness connector F251 as follows and then interrupt it. Listen to each fuel injector operating sound.

BATTERY CONNECTION

Cylinder	Harness connector F251 terminal
Cylinder	(+)	(-)
1	5	6
2		4
3		2
4		3
5		1
6		7

Fig 4: Identifying Function Of Fuel Injector-II

Courtesy of NISSAN MOTOR CO., U.S.A.

Operating sound should exist.

OK or NG

OK : INSPECTION END

NG : GO TO 6.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
  
  Fig 5: Identifying Fuel Injector Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch ON.
4. Check voltage between fuel injector terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage

OK or NG

OK : GO TO 8.

NG : GO TO 7.

Fig 6: Identifying Voltage Between Fuel Injector Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M82, F102
- Fuse block (J/B) connector M1
- 10A fuse
- Harness for open or short between fuel injector and fuse
  : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between fuel injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42.
  Refer to Wiring Diagram.
  
  Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG

OK : GO TO 10.

NG : GO TO 9.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F251, F50
- Harness for open or short between fuel injector and ECM
  : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUEL INJECTOR
Refer to "COMPONENT INSPECTION ".

OK or NG

OK : GO TO 11.

NG : Replace fuel injector.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END