Infiniti Q45. Manual - part 15

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-53

[ICC]

C

D

E

F

G

H

I

J

L

M

A

B

ACS

DTC 62 BOOSTER SOL/V CIRCUIT

NKS001KN

1. 

CHECK ICC UNIT AND BRAKE BOOSTER CONNECTORS

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector and brake booster connector, and connect them securely again.

3.

Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.

Is malfunction indicated?

YES

>> GO TO 2.

NO

>> Poor connector connection

1. Check connector. (Check connector housing for disconnected, loose, bent, and collapsed ter-

minals. If any malfunction is detected, repair applicable part.)

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

2. 

CHECK HARNESS BETWEEN ICC UNIT AND BRAKE BOOSTER

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector and brake booster connector.

3.

Check continuity between ICC unit harness connector (A) and
brake booster harness connector (B).

4.

Check continuity between ICC unit harness connector and
ground.

OK or NG

OK

>> GO TO 3.

NG

>> 1. Repair harness between ICC unit and brake booster.

2. Erase DTC and perform ICC system running test.

Then perform self-diagnosis of ICC system again.

3. 

CHECK BOOSTER SOLENOID

Check booster solenoid. Refer to 

ACS-77, "Booster Solenoid"

 .

OK or NG

OK

>> 1. Replace ICC unit.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

NG

>> Booster solenoid malfunction

1. Replace brake booster. 

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again. 

A

B

Continuity

Connector

Terminal

Connector

Terminal

B243

10

E81

4

Yes

12

6

PKIC5179E

ICC unit 

connector

Terminal

Ground

Continuity

B243

10

No

12

PKIB4148E

ACS-54

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

DTC 63 RELEASE SW CIRCUIT

NKS001KO

1. 

CHECK ICC UNIT AND BRAKE BOOSTER CONNECTORS

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector and brake booster connector, and connect them securely again.

3.

Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.

Is malfunction indicated?

YES

>> GO TO 2.

NO

>> Poor connector connection

1. Check connector. (Check connector housing for disconnected, loose, bent, and collapsed ter-

minals. If any malfunction is detected, repair applicable part.)

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

2. 

CHECK HARNESS BETWEEN ICC UNIT AND BRAKE BOOSTER 

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector and brake booster connector.

3.

Check continuity between ICC unit harness connector (A) and
brake booster harness connector (B).

4.

Check continuity between ICC unit harness connector and
ground.

OK or NG

OK

>> GO TO 3.

NG

>> 1. Repair harness between brake booster and ICC unit.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

A

B

Continuity

ICC unit 

connector

Terminal

Brake booster 

connector

Terminal

B243

6

E81

1

Yes

15

3

22

2

ICC unit 

connector

Terminal

Ground

Continuity

B243

6

No

15

22

PKIC5180E

PKIB1446E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-55

[ICC]

C

D

E

F

G

H

I

J

L

M

A

B

ACS

3. 

CHECK RELEASE SWITCH POWER SUPPLY CIRCUIT 

1.

Connect ICC unit connector.

2.

Turn ignition switch ON.

3.

Check voltage between ICC unit harness connector and ground.

OK or NG

OK

>> GO TO 4.

NG

>> 1. Replace ICC unit.

2. Erase DTC and perform ICC system running test.

Then perform self-diagnosis of ICC system again.

4. 

CHECK RELEASE SWITCH 

1.

Turn ignition switch OFF.

2.

Check release switch. Refer to 

ACS-77, "Release Switch"

 .

OK or NG

OK

>> 1. Replace ICC unit.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

NG

>> Release switch malfunction

1. Replace brake booster.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

DTC 65 PRESSURE CONTROL

NKS001KP

1. 

OPERATION CHECK 

Check foot brake pedal operates normally.

OK or NG

OK

>> GO TO 2.

NG

>> 1. Check brake circuit.

2. After repairing, erase DTC and perform “ACTIVE TEST” (BOOSTER SOL/V3) with CONSULT-

II. Then perform self-diagnosis of ICC system again.

2. 

CHECK BOOSTER SOLENOID 

Check booster solenoid. Refer to 

ACS-77, "Booster Solenoid"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Booster solenoid malfunction

1. Replace brake booster.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

Terminals

Voltage (Approx.)

(+)

(

−

)

ICC unit 

connector

Terminal

B243

6

Ground

10 V

SKIA6656E

ACS-56

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

3. 

CHECK HARNESS BETWEEN ICC UNIT AND BRAKE BOOSTER

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector and brake booster connector.

3.

Check continuity between ICC unit harness connector (A) and
brake booster harness connector (B).

4.

Check continuity between ICC unit harness connector and
ground.

OK or NG

OK

>> 1. Replace ICC unit.

2. Erase DTC and perform ICC system running test.

Then perform self-diagnosis of ICC system again.

NG

>> 1. Repair harness between brake booster and ICC unit.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

DTC 74 LASER BEAM OFF CNTR

NKS001KQ

1. 

ADJUST LASER BEAM AIMING

1.

Adjust laser beam aiming. Then erase DTC, and perform ICC system running test.

2.

Perform self-diagnosis of ICC system.

3.

Check if “DTC 74 LASER BEAM OFF CNTR” is indicated.

Is it indicated?

YES

>> 1. Replace ICC sensor, and adjust laser beam aiming.

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

NO

>> INSPECTION END

DTC 90 STOP LAMP RLY FIX

NKS001KR

1. 

CHECK CONNECTOR FOR ICC UNIT 

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector, and connect it securely again.

3.

Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.

Is malfunction indicated?

YES

>> GO TO 2.

NO

>> Poor connector connection

1. Check connector (Check connector housing for disconnected, loose, bent, and collapsed termi-

nals. If any malfunction is detected, repair applicable part).

2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system

again.

A

B

Continuity

ICC unit 

connector

Terminal

Brake booster 

connector

Terminal

B243

10

E81

4

Yes

12

6

ICC unit 

connector

Terminal

Ground

Continuity

B243

10

No

12

PKIC5179E

PKIB4148E