Infiniti M35/M45 Y50. Manual - part 737

IGNITION SIGNAL

EC-1421

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11. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connector F3

●

Harness for open or short between ignition coil and harness connector F3

>> Repair or replace harness or connectors.

12. 

CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check harness continuity between ignition coil terminal 2 and ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 13.

NG

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

13. 

CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminals 46, 60, 61, 62, 65, 79, 80, 81 and ignition coil terminal
1. Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 14.

NG

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

14. 

CHECK IGNITION COIL WITH POWER TRANSISTOR

Refer to 

EC-1421, "Component Inspection"

 .

OK or NG

OK

>> GO TO 15.

NG

>> Replace ignition coil with power transistor.

15. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS005PT

IGNITION COIL WITH POWER TRANSISTOR

CAUTION:

Do the following procedure in the place where ventilation is good without the combustible.

1.

Turn ignition switch OFF.

2.

Disconnect ignition coil harness connector.

Continuity should exist.

Continuity should exist.

EC-1422

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IGNITION SIGNAL

3.

Check resistance between ignition coil terminals as follows.

4.

If NG, replace ignition coil with power transistor.
If OK, go to next step.

5.

Turn ignition switch OFF.

6.

Reconnect all harness connectors disconnected.

7.

Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pres-
sure.

NOTE:
Do not use CONSULT-II to release fuel pressure, or fuel pres-
sure applies again during the following procedure.

8.

Start engine.

9.

After engine stalls, crank it two or three times to release all fuel
pressure.

10. Turn ignition switch OFF.

11. Remove all ignition coil harness connectors to avoid the electri-

cal discharge from the ignition coils.

12. Remove ignition coil and spark plug of the cylinder to be checked.

13. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
14. Connect spark plug and harness connector to ignition coil.

15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm

between the edge of the spark plug and grounded metal portion
as shown in the figure.

16. Crank engine for about 3 seconds, and check whether spark is

generated between the spark plug and the grounded metal por-
tion.

CAUTION:

●

Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20kV or more.

●

It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.

17. If NG, replace ignition coil with power transistor.

CONDENSER

1.

Turn ignition switch OFF.

2.

Disconnect condenser harness connector.

Terminal No. (Polarity)

Resistance 

Ω

 [at 25

°

C (77

°

F)]

1 and 2

Except 0 or 

∞

1 and 3

Except 0

2 and 3

Spark should be generated.

PBIB0847E

PBIB2697E

PBIB2325E

IGNITION SIGNAL

EC-1423

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3.

Check resistance between condenser terminals 1 and 2.

Removal and Installation

NBS005PU

IGNITION COIL WITH POWER TRANSISTOR

Refer to 

EM-190, "IGNITION COIL"

 .

Resistance:

Above 1 M

Ω

 [at 25

°

C (77

°

F)]

PBIB0794E

EC-1424

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REFRIGERANT PRESSURE SENSOR

REFRIGERANT PRESSURE SENSOR

PFP:92136

Component Description

NBS005Q7

The refrigerant pressure sensor (1) is installed at the condenser of
the air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan system.

PBIA9537J

PBIB2657E