Infiniti F50. Manual - part 502

IGNITION SIGNAL

EC-649

C

D

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EC

6. 

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect ECM relay.

4.

Check harness continuity between ECM terminal 12 and ECM
relay terminal 3.
Refer to Wiring Diagram.

5.

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

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M135, F105

●

Fuse block (J/B) No. 2 harness connector M143

●

Joint connector-21

●

Harness for open or short between ECM and ECM relay

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

8. 

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV

Check voltage between ECM relay terminal 5 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 9.

9. 

DETECT MALFUNCTIONING PART

Check the following.

●

20A fuse

●

Fuse, fusible link and relay block (J/B) harness connector E3

●

Fuse block (J/B) No. 2 harness connector E215

●

Harness for open and short between ECM relay and fuse

>> Repair or replace harness or connectors.

10. 

CHECK ECM RELAY

Refer to 

EC-140, "Component Inspection"

 .

OK or NG

OK

>> GO TO 18.

NG

>> Replace ECM relay.

Continuity should exist.

PBIB0040E

Voltage: Battery voltage

PBIB0137E

EC-650

IGNITION SIGNAL

11. 

CHECK CONDENSER CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect condenser harness connector.

3.

Check harness continuity between ECM terminal 12 and condenser terminal 1, condenser terminal 2 and
engine ground.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 12.

NG

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

12. 

CHECK CONDENSER

Refer to 

EC-651, "Component Inspection"

OK or NG

OK

>> GO TO 13.

NG

>> Replace condenser.

13. 

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V

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-II or tester.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 14.

14. 

DETECT MALFUNCTIONING PART

Check the harness for open or short between ignition coil and harness connector F105.

>> Repair or replace harness or connectors.

Continuity should exist.

Voltage: Battery voltage

PBIB1248E

PBIB0138E

IGNITION SIGNAL

EC-651

C

D

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EC

15. 

CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

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

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 16.

NG

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

16. 

CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminals 18, 19, 20, 21, 29, 30, 31, 32 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 17.

NG

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

17. 

CHECK IGNITION COIL WITH POWER TRANSISTOR

Refer to 

EC-651, "Component Inspection"

 .

OK or NG

OK

>> GO TO 18.

NG

>> Replace ignition coil with power transistor.

18. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

EBS00MNZ

IGNITION COIL WITH POWER TRANSISTOR

1.

Turn ignition switch “OFF”.

2.

Disconnect ignition coil harness connector.

3.

Check resistance between ignition coil terminals as follows.

CONDENSER

1.

Turn ignition switch “OFF”.

2.

Disconnect condenser harness connector.

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

EC-652

IGNITION SIGNAL

3.

Check resistance between condenser terminals 1 and 2.

Removal and Installation

EBS00MO0

IGNITION COIL WITH POWER TRANSISTOR

Refer to 

EM-28, "IGNITION COIL"

 .

Resistance

Above 1 M

Ω

 at 25

°

C (77

°

F)

PBIB0794E