Infiniti QX56 (JA60). Manual - part 439

 

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Infiniti QX56 (JA60). Manual - part 439

 

 

EC-408

< COMPONENT DIAGNOSIS >

[VK56DE]

IGNITION SIGNAL

OK

>> INSPECTION END

NG

>> GO TO 10.

4.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.

2. Check voltage between ECM terminals 119, 120 and ground

with CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> Go to 

EC-82

.

5.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF.

2. Disconnect condenser-1 harness connector.

3. Turn ignition switch ON.

4. Check voltage between condenser-1 terminal 1 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 6.

6.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R connector E119.

3. Check harness continuity between IPDM E/R terminal 4 and condenser-1 terminal 1.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> Go to 

EC-82

.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

Voltage: Battery voltage

MBIB0034E

BBIA0358E

Voltage: Battery voltage

PBIB0624E

Continuity should exist.

IGNITION SIGNAL

EC-409

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

• Harness for open or short between condenser-1 and IPDM E/R

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

8.

CHECK CONDENSER-1 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Check harness continuity between condenser-1 terminal 2 and ground.

Refer to Wiring Diagram.

3. Also check harness for short to power.
OK or NG

OK

>> GO TO 9.

NG

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

9.

CHECK CONDENSER-1

Refer to 

EC-410, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace condenser-1.

10.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Disconnect ignition coil harness connector.

4. Turn ignition switch ON.

5. Check voltage between ignition coil terminal 3 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness for open or short between ignition coil and harness connector F32

Continuity should exist.

1.

Ignition coils (with power transistor) 
(bank 2)

2.

Ignition coils (with power transistor) 
(bank 1)

Voltage: Battery voltage

BBIA0777E

PBIB0138E

EC-410

< COMPONENT DIAGNOSIS >

[VK56DE]

IGNITION SIGNAL

>> 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-410, "Component Inspection"

.

 OK or NG

OK

>> GO TO 15.

NG

>> Replace ignition coil with power transistor.

15.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-35, "How to Check Terminal"

 and 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005149484

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.

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.

Continuity should exist.

Continuity should exist.

Terminal No. (Polarity)

Resistance 

Ω [at 25°C (77°F)]

1 and 2

Except 0 or 

1 and 3

Except 0

2 and 3

PBIB0847E

IGNITION SIGNAL

EC-411

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

7. Remove fuel pump fuse in IPDM E/R to release fuel pressure.

NOTE:

Do not use CONSULT-III 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 (0.52 -

0.66 in) 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 (0.66 in) is taken.

NOTE:

When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is mal-

functioning.

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

CONDENSER-1

1. Turn ignition switch OFF.

2. Disconnect condenser-1 harness connector.

3. Check resistance between condenser-1 terminals 1 and 2.

Spark should be generated.

BBIA0380E

PBIB2325E

Resistance

Above 1 M

Ω [at 25°C (77°F)]

PBIB0794E

 

 

 

 

 

 

 

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