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: Identifying CONSULT-II Display Screen Active Test
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 6 .

CHECK FUNCTION OF INJECTOR-I

With out CONSULT-II

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

Fig 2: Disconnecting 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.
1. 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: Checking Harness Continuity Between Harness Connector F50 And ECM

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

CONTINUITY BETWEEN TERMINALS CHART

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
- Harness connectors F50, F251
- Fuse block (J/B) connector M4
- 15A fuse
- Harness for open or short between harness connector F50 and fuse
- Harness for open or short between harness connector F50 and ECM
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUNCTION OF INJECTOR-II
Provide battery voltage between harness connector F251 as follows and then interrupt it. Listen to each injector operating sound.

Fig 4: Harness Connector F251 Terminals Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Providing Battery Voltage Between Harness Connector F251
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Operating sound should exist.
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 6.
CHECK INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect injector harness connector.
  
  Fig 6: Disconnecting Injector Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch ON.
4. Check voltage between injector terminal 1 and ground with CONSULT-II or tester.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 8 .
2. NG: GO TO 7.
Fig 7: Checking Voltage Between Injector Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M82, F102
- Harness connectors F50, F251
- Fuse block (J/B) connector M4
- 10A fuse
- Harness for open or short between injector and fuse
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42.
  Refer to WIRING DIAGRAM .
  1. 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 F251, F50
- Harness for open or short between injector and ECM
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INJECTOR
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 11.
2. NG: Replace injector.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END