Infiniti FX35, FX50 (S51). Manual - part 734

ICC BRAKE SWITCH

EC-477

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

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EC

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Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ICC brake switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 4.

4.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake hold relay.

3.

Turn ignition switch ON.

4.

Check the voltage between ICC brake hold relay harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 3)
• Harness for open or short between ICC brake hold relay and fuse

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

6.

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF.

2.

Check the continuity between ICC brake switch harness connector and ICC brake hold relay harness con-
nector.

3.

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

ECM

Condition

Voltage (V)

Connector

+

–

Terminal

Terminal

M107

117

(ICC brake switch signal)

128

Brake pedal

Slightly depressed

Approx. 0

Fully released

Battery voltage

ICC brake switch

Ground

Voltage

Connector

Terminal

E114

1

Ground

Battery voltage

ICC brake hold relay

Ground

Voltage

Connector

Terminal

E91

3

Ground

Battery voltage

ICC brake switch

ICC brake hold relay

Continuity

Connector

Terminal

Connector

Terminal

E114

1

E91

4

Existed

EC-478

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

ICC BRAKE SWITCH

Is the inspection result normal?

YES

>> GO TO 7.

NO

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

7.

CHECK ICC BRAKE HOLD RELAY CONTROL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect brake booster control unit harness connector.

3.

Check the continuity between ICC brake hold relay harness connector and brake booster control unit har-
ness connector.

4.

Check the continuity between ICC brake hold relay harness connector and ground.

5.

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

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E106, M6
• Harness connectors M117, B201
• Harness for open or short between ICC brake hold relay and brake booster control unit
• Harness for open or short between ICC brake hold relay and ground

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

9.

CHECK ICC BRAKE HOLD RELAY

Refer to 

EC-1112, "Component Inspection (ICC Brake Hold Relay)"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace ICC brake hold relay.

10.

CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between ICC brake switch harness connector and ECM harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E106, M6

ICC brake hold relay

Brake booster control unit

Continuity

Connector

Terminal

Connector

Terminal

E91

1

B249

47

Existed

ICC brake hold relay

Ground

Continuity

Connector

Terminal

E91

2

Ground

Existed

ICC brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E114

2

M107

126

Existed

ICC BRAKE SWITCH

EC-479

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

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M

A

EC

N

P

O

• Harness for open or short between ICC brake switch and ECM

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

12.

CHECK ICC BRAKE SWITCH

Refer to 

EC-479, "Component Inspection (ICC Brake Switch)"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Replace ICC brake switch.

13.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (ICC Brake Switch)

INFOID:0000000005237095

1.

CHECK ICC BRAKE SWITCH-I

1.

Turn ignition switch OFF.

2.

Disconnect ICC brake switch harness connector.

3.

Check the continuity between ICC brake switch terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK ICC BRAKE SWITCH-II

1.

Adjust ICC brake switch installation. Refer to 

BR-7, "Inspection and Adjustment"

.

2.

Check the continuity between ICC brake switch terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ICC brake switch.

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly depressed

Not existed

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly depressed

Not existed

EC-480

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

IGNITION SIGNAL

IGNITION SIGNAL

Description

INFOID:0000000005237096

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:0000000005237097

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-480, "Diagnosis Procedure"

.

2.

CHECK IGNITION SIGNAL FUNCTION

With CONSULT-III

1.

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

2.

Check that each circuit produces a momentary engine speed drop.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-480, "Diagnosis Procedure"

.

3.

CHECK IGNITION SIGNAL FUNCTION

 Without CONSULT-III

1.

Let engine idle.

2.

Read the voltage signal between ECM harness connector terminals under the following conditions 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-480, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005237098

1.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1.

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

2.

Check the voltage between ECM harness connector terminals under the following conditions.

ECM

Voltage signal

+

–

Connector

Terminal

Connector

Terminal

F101

11

M107

128

12

15

16

19

20

JMBIA0035GB