Infiniti M45 (Y34). Manual - part 494

INJECTOR CIRCUIT

EC-665

C

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EC

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure

ABS002TT

1. 

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?

Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

6

13
15
17

L
P
B/R
G

Injector No. 2
Injector No. 4
Injector No. 6
Injector No. 8

[Engine is running]

●

Warm-up condition

●

Idle speed

NOTE:
The pulse cycle changes depending on rpm at idle.

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

PBIB0042E

PBIB0043E

EC-666

INJECTOR CIRCUIT

2. 

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.

 Without CONSULT-II

1.

Start engine.

2.

Listen to each injector operating sound.
Clicking noise should be heard.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

PBIB0133E

PBIB1986E

INJECTOR CIRCUIT

EC-667

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EC

3. 

CHECK INJECTOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect harness connectors F21, F201 (bank 1) and harness connectors F41, F221 (bank 2).

3.

Turn ignition switch ON.

4.

Check voltage between the following;
harness connector F21 terminal 5 and ground, 
harness connector F41 terminal 5 and ground 
with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E33, F33

●

Harness connectors F21, F201

●

Harness connectors F41, F221

●

Joint connector-19

●

Fuse block (J/B) No. 1 connector M1

●

Fuse block (J/B) No. 2 connectors M143, E215

●

15A fuse

●

Harness for open or short between harness connector F21 and fuse

●

Harness for open or short between harness connector F41 and fuse

>> Repair open circuit or short to ground or short to power in harness or connectors.

Voltage: Battery voltage

PBIB1121E

PBIB0180E

EC-668

INJECTOR CIRCUIT

5. 

CHECK INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between the following terminals. Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 6.

NG

>> Repair open circuit or short to ground or shot to power in harness or connectors.

6. 

CHECK SUB-HARNESS CIRCUIT FOR OPEN AND SHORT

1.

Disconnect injector harness connectors.

2.

Check harness continuity between the following terminals. Refer to Wiring Diagram.

OK or NG

OK

>> GO TO 7.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

7. 

CHECK INJECTOR

Refer to 

EC-669, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace injector.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Harness connector

Terminal

ECM terminal

F21

3

5

2

7

1

14

6

16

F41

3

6

2

13

1

15

6

17

Continuity should exist.

Harness connector

Terminal

Injector terminal

F21

5

1

1, 2, 3, 6

2

F41

5

1

1, 2, 3, 6

2

Continuity should exist.