Diagnostic Procedure

WARNING: This page is about a different car, the 2008 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

Yes (With CONSULT-III)>>GO TO 2.

Yes (Without CONSULT-III)>>GO TO 3.

No: GO TO 3.
CHECK OVERALL FUNCTION
With CONSULT-III
1. Start engine.
2. Perform "POWER BALANCE" in "ACTIVE TEST " mode with CONSULT-III.
3. Make sure that each circuit produces a momentary engine speed drop.
OK or NG

OK: INSPECTION END

NG: GO TO 3.

CHECK FUNCTION OF FUEL INJECTOR-I

Without CONSULT-III

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

Fig 1: Identifying Harness Connector F21, F201 (Bank 1) And F41, F221 (Bank 2)
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-III or tester.

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

Check harness continuity between the following terminals.

CONTINUITY CONDITIONS

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.

Fig 2: Checking Voltage Between Harness Connector F21 Terminal 5 And Ground

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

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
  >> 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 the following terminals, and then interrupt it. Listen to each fuel injector operating sound.

TERMINALS REFERENCE

Cylinder	Harness connector	terminal
Cylinder	Harness connector	(+)	(-)
1	F201	5	3
3			2
5			1
7			6
2	F221	5	3
4			2
6			1
8			6

Operating sound should exist.

OK or NG

OK: INSPECTION END

NG: GO TO 6.

Fig 3: Checking Function Of Fuel Injector-II

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

CHECK SUB-HARNESS CIRCUIT FOR OPEN AND SHORT

Disconnect fuel injector harness connectors.

Fig 4: Identifying Fuel Injector Harness Connectors
Courtesy of NISSAN MOTOR CO., U.S.A.

Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .

TERMINALS REFERENCE

Harness connector terminal	Fuel injector terminal
F201 terminal 1	2
F201 terminal 2
F201 terminal 3
F201 terminal 6
F201 terminal 5	1
F221 terminal 1	2
F221 terminal 2
F221 terminal 3
F221 terminal 6
F221 terminal 5	1

Continuity should exist.

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

OK or NG

OK: GO TO 7.

NG: 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 8.

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

>> INSPECTION END