Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti FX45. 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 3 .
CHECK OVERALL FUNCTION
WITH CONSULT-II
1. Start engine.
2. Perform " " in "ACTIVE TEST" mode with CONSULT-II.
3. Make sure that each circuit produces a momentary engine speed drop.
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 3.
Fig 1: Checking Overall Function
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK FUNCTION OF INJECTOR-I

Turn ignition switch OFF.
Disconnect harness connector F21, F201 (bank 1) and F41, F221 (bank 2).

Fig 2: Disconnecting Harness Connector F21, F201 And F41, F221
Courtesy of NISSAN MOTOR CO., U.S.A.
Turn ignition switch ON.
Check voltage between the following; harness connector F21 terminal 5 and ground, harness connector F41 terminal 5 and ground with CONSULT-II or tester.
1. Voltage: Battery voltage
Turn ignition switch OFF.
Disconnect ECM harness connector.

Fig 3: Disconnecting ECM Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.

Check harness continuity between the following terminals.

CONTINUITY SPECIFICATIONS

Cylinder	Harness connector terminal	ECM terminal
1	F21 terminal 3	23
3	F21 terminal 2	22
5	F21 terminal 1	21
7	F21 terminal 6	44
2	F41 terminal 3	42
4	F41 terminal 2	41
6	F41 terminal 1	40
8	F41 terminal 6	63

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 F21, F201
- Harness connectors F41, F221
- Fuse block (J/B) connector M1
- 15A fuse
- Harness for open or short between harness connector F21 and fuse
- Harness for open or short between harness connector F41 and fuse
- Harness for open or short between harness connector F21 and ECM
- Harness for open or short between harness connector F41 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 the following terminals, and then interrupt it. Listen to each injector operating sound.

Fig 4: Voltage Specifications Voltage
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Check Function Of Injector-II
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 SUB-HARNESS CIRCUIT FOR OPEN AND SHORT
1. Disconnect injector harness connectors.
  
  Fig 6: Disconnecting Injector Harness Connectors
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .
  
  Fig 7: Continuity Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 7.
2. NG: 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 8.
2. NG: Replace injector.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END