Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

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: Active Test Display
  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

Without CONSULT-II

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

Fig 2: Disconnect Harness Connector F33, F221
Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between harness connector F33 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 F33 and ECM as follows.

Refer to Wiring Diagram.

CHECK

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

Fig 3: Checking Harness Continuity Between Harness Connector F33 And ECM

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

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
- Harness connectors F33, F221
- 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
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 F221 as follows and then interrupt it. Listen to each injector operating sound.

Fig 4: Cylinder Harness Connector Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Checking Battery Voltage Between Harness Connector F221
Courtesy of NISSAN MOTOR CO., U.S.A.

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.
  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 With CONSULT-II Or Tester
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 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.
  
  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 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