Diagnostic Procedure

INSPECTION START
Turn ignition switch to START.

Is any cylinder ignited?

Yes or No
1. Yes (With CONSULT-II): GO TO 2.
2. Yes (without CONSULT-II): GO TO 3.
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 Screen Display - ACTIVE TEST Mode
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 6.

CHECK FUNCTION OF FUEL INJECTOR-I

Without CONSULT-II

Turn ignition switch OFF.
Disconnect harness connector F33, F221
Turn ignition switch ON.

Fig 2: Identifying Harness Connector F33 And F221
Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between harness connector F33 terminal 5 and ground with CONSULT-II or tester.

Fig 3: Identifying Voltage Between Harness Connector F33 Terminal 5 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Voltage: Battery voltage
Turn ignition switch OFF.
Disconnect ECM harness connector.

Check harness continuity between harness connector F33 and ECM as follows.

TERMINALS CONTINUITY REFERENCE

Cylinder	Harness connector F33 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 M72, F102
- Fuse block (J/B) connector M4
- 10A fuse
- Harness for open or short between harness connector F33 and fuse
- Harness for open or short between harness connector F33 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 F221 as follows and then interrupt it. Listen to each fuel injector operating sound.

TERMINALS VOLTAGE REFERENCE

Cylinder	Harness connector F221 terminal
Cylinder	(+)	(-)
1	5	6
2		4
3		2
4		3
5		1
6		7

Operating sound should exist.

Fig 4: Identifying Function Of Fuel Injector-II

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

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
  
  Fig 6: Identifying Voltage Between Fuel Injector Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 7.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M72, F102
- Harness connectors F33, F221
- Fuse block (J/B) connector M4
- 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
1. OK: GO TO 10.
2. NG: GO TO 9.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F221, F33
- 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
1. OK: GO TO 11.
2. NG: Replace malfunctioning fuel injector.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END