Infiniti Q45. Manual - part 13

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-45

[ICC]

C

D

E

F

G

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M

A

B

ACS

DTC 20 CAN COMM CIRCUIT

NKS001KG

1. 

CHECK CAN COMMUNICATION

 With CONSULT-II

1.

Perform self-diagnosis.

2.

Print self-diagnostic result.

>> After printing self-diagnostic result, go to “CAN system”. Refer to 

LAN-17, "Precautions When

Using CONSULT-II"

 .

DTC 31 POWER SUPPLY CIR, DTC 34 POWER SUPPLY CIR 2

NKS001KH

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 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 POWER SUPPLY CIRCUIT FOR ICC UNIT

1.

Turn ignition switch ON.

2.

Check voltage between ICC unit harness connector and ground.

OK or NG

OK

>> GO TO 3.

NG

>> 1. Repair ICC unit power supply harness or fuse.

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

again.

Terminals

Voltage (Approx.)

(+)

(

−

)

ICC unit connector

Terminal

B244

33

Ground

Battery voltage

42

SKIA1173E

ACS-46

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

3. 

CHECK GROUND CIRCUIT FOR ICC UNIT

1.

Turn ignition switch OFF.

2.

Disconnect ICC unit connector.

3.

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 ICC unit ground harness.

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

again.

DTC 41 VHCL SPEED SE CIRC

NKS001KI

1. 

PERFORM ICC UNIT SELF-DIAGNOSIS

1.

Perform self-diagnosis.

2.

Check if “DTC 43 ABS/TCS/VDC CIRC” or “DTC 20 CAN COMM CIRCUIT” other than “DTC 41 VHCL
SPEED SE CIRC” is indicated in self-diagnosis item in the display.

Is any indicated?

YES

>> 1. Repair or replace applicable item.

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

again.

NO

>> GO TO 2.

2. 

CHECK AT VEHICLE SPEED SENSOR

 With CONSULT-II

With “ICC” “DATA MONITOR”, check if “VHCL SPD AT” operates normally. Refer to 

ACS-34, "DATA MONI-

TOR"

 .

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. Perform “A/T” self-diagnosis.

2. After repairing or replacing applicable item, erase DTC and perform ICC system running test.

Then perform self-diagnosis of ICC system again.

ICC unit con-

nector

Terminal

Ground

Continuity

B243

19

Yes

20

B244

46

SKIA6650E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

ACS-47

[ICC]

C

D

E

F

G

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A

B

ACS

DTC 43 ABS/TCS/VDC CIRC

NKS001KJ

1. 

PERFORM ICC UNIT SELF-DIAGNOSIS

 With CONSULT-II

1.

Perform self-diagnosis.

2.

Check if “DTC 20 CAN COMM CIRCUIT” other than “DTC 43 ABS/TCS/VDC CIRC” is indicated in self-
diagnosis item in the display.

Is it indicated?

YES

>> 1. Repair or replace applicable item.

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

again.

NO

>> GO TO 2.

2. 

PERFORM VDC/TCS/ABS CONTROL UNIT SELF-DIAGNOSIS

 With CONSULT-II

1.

Perform self-diagnosis of VDC/TCS/ABS control unit. Refer to 

BRC-10, "TROUBLE DIAGNOSIS"

 .

2.

Check if malfunction is indicated. 

Is malfunction indicated?

YES

>> 1. Repair or replace applicable item.

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

again.

NO

>> 1. Replace ICC unit.

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

again.

DTC 45 BRAKE SW/STOP L SW

NKS001KK

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 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 STOP LAMP SWITCH AND ICC BRAKE SWITCH

 With CONSULT-II

With “ICC” “DATA MONITOR”, check if “STOP LAMP SW” and “BRAKE SW” are operated normally. Refer to

ACS-34, "DATA MONITOR"

 . 

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

>>

●

BRAKE SW: GO TO 3.

●

STOP LAMP SW: GO TO 5.

ACS-48

[ICC]

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

3. 

CHECK BRAKE SWITCH INSTALLATION AND ADJUSTMENT

Check ICC brake switch for proper installation, and adjust the switch if necessary. Refer to 

BR-6, "BRAKE

PEDAL"

 .

OK or NG

OK

>> GO TO 4.

NG

>> After adjustment, erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

4. 

CHECK ICC BRAKE SWITCH

Check ICC brake switch. Refer to 

ACS-78, "ICC Brake Switch and Stop Lamp 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

>> 1. Replace ICC brake switch.

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

again.

5. 

CHECK STOP LAMP ILLUMINATION

Check stop lamp illumination.

OK or NG

OK

>> GO TO 6.

NG

>> 1. Check stop lamp circuit.

2. After repairing, erase DTC and perform ICC system running test. Then perform self-diagnosis

of ICC system again.

6. 

CHECK ICC BRAKE HOLD RELAY

1.

Turn ignition switch OFF.

2.

Remove ICC brake hold relay.

3.

Check ICC brake hold relay. Refer to 

ACS-78, "ICC BRAKE HOLD RELAY"

OK or NG

OK

>> GO TO 7.

NG

>> 1. Replace brake hold relay.

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

again.