Infiniti G37 Coupe. Manual - part 579

 

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Infiniti G37 Coupe. Manual - part 579

 

 

ICC BRAKE SWITCH

EC-497

< COMPONENT DIAGNOSIS >

[VQ37VHR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ICC clutch switch.

Terminals

Condition

Continuity

1 and 2

Clutch pedal

Fully released

Existed

Slightly depressed

Not existed

EC-498

< COMPONENT DIAGNOSIS >

[VQ37VHR]

IGNITION SIGNAL

IGNITION SIGNAL

Description

INFOID:0000000001734326

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil
secondary circuit.

Component Function Check

INFOID:0000000001734327

1.

INSPECTION START

Turn ignition switch OFF, and restart engine.

Does the engine start?

YES-1 >> With CONSULT-III: GO TO 2.
YES-2 >> Without CONSULT-III: GO TO 3.
No

>> Go to 

EC-498, "Diagnosis Procedure"

.

2.

CHECK IGNITION SIGNAL FUNCTION

With CONSULT-III

1.

Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.

2.

Make sure that each circuit produces a momentary engine speed drop.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-498, "Diagnosis Procedure"

.

3.

CHECK IGNITION SIGNAL FUNCTION

 Without CONSULT-III

1.

Let engine idle.

2.

Read the voltage signal between ECM harness connector and ground with an oscilloscope.

NOTE:

The pulse cycle changes depending on rpm at idle.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-498, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001734328

1.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1.

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

2.

Check the voltage between ECM harness connector and ground.

ECM

Ground

Voltage signal

Connector

Terminal

F101

11

Ground

12

15

16

19

20

JMBIA0035GB

ECM

Ground

Voltage

Connector

Terminal

M107

125

Ground

Battery voltage

IGNITION SIGNAL

EC-499

< COMPONENT DIAGNOSIS >

[VQ37VHR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

EC-140, "Diagnosis Procedure"

.

2.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect condenser harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between condenser harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 3.

3.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector E7.

3.

Check the continuity between IPDM E/R harness connector and condenser harness connector.

4.

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

Is the inspection result normal?

YES

>> Go to 

EC-140, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E3, F1
• Harness for open or short between IPDM E/R and condenser

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

5.

CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check the continuity between condenser harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

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

6.

CHECK CONDENSER

Refer to 

EC-502, "Component Inspection (Condenser)"

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace condenser.

Condenser

Ground

Voltage

Connector

Terminal

F8

1

Ground

Battery voltage

IPDM E/R

Condenser

Continuity

Connector

Terminal

Connector

Terminal

E7

53

F8

1

Existed

Condenser

Ground

Continuity

Connector

Terminal

F8

2

Ground

Existed

EC-500

< COMPONENT DIAGNOSIS >

[VQ37VHR]

IGNITION SIGNAL

7.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV

1.

Reconnect all harness connectors disconnected.

2.

Disconnect ignition coil harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ignition coil harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connector F1
• Harness for open or short between ignition coil and harness connector F1

>> Repair or replace harness or connectors.

9.

CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check the continuity between ignition coil harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 10.

NO

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

10.

CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check the continuity between ignition coil harness connector and ECM harness connector.

Ignition coil

Ground

Voltage

Cylinder

Connector

Terminal

1

F11

3

Ground

Battery voltage

2

F12

3

3

F13

3

4

F14

3

5

F15

3

6

F16

3

Ignition coil

Ground

Continuity

Cylinder

Connector

Terminal

1

F11

2

Ground

Existed

2

F12

2

3

F13

2

4

F14

2

5

F15

2

6

F16

2

 

 

 

 

 

 

 

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