Infiniti FX35, FX50 (S51). Manual - part 322

CCS-108

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C1A31 BCU INTERNAL MALF

C1A31 BCU INTERNAL MALF

Description

INFOID:0000000005501664

The brake booster control unit inputs the brake fluid pressure control signal and release switch signal and
transmits them to ICC sensor integrated unit via ITS communication. Also, it receives the brake fluid pressure
command signal from ICC sensor integrated unit via ITS communication and activates the booster solenoid to
operate the brake booster (brake). 

DTC Logic

INFOID:0000000005501665

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the MAIN switch of ICC system ON. 

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “C1A31” is detected as the current malfunction in “Self Diagnostic Result” of “ICC”. 

Is “C1A31” detected as the current malfunction?

YES

>> Refer to 

CCS-108, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501666

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if any DTC other than “C1A31” is detected in “Self Diagnostic Result” of “ICC”. 
Is any DTC detected?

YES

>> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to

CCS-162, "DTC Index"

.

NO

>> Replace the brake booster control unit. 

Special Repair Requirement

INFOID:0000000005501667

DESCRIPTION

Perform the action test after adjusting the laser beam aiming of ICC sensor integrated unit when the following
operation is performed. 
• Removal and installation of ICC sensor integrated unit
• Replacement of ICC sensor integrated unit

SPECIAL REPAIR REQUIREMENT

1.

LASER BEAM AIMING ADJUSTMENT OF ICC SENSOR INTEGRATED UNIT

Adjust the laser beam aiming of the ICC sensor integrated unit. Refer to 

CCS-13, "LASER BEAM AIMING

ADJUSTMENT : Description"

. 

>> GO TO 2.

2.

CHECK ICC SYSTEM

1.

Erase the “Self Diagnostic Result”, and then perform “All DTC Reading” again after performing the action
test. (Refer to 

CCS-18, "ACTION TEST : Description"

 for action test.)

DTC

(On board dis-

play)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A31

(31)

BCU INTERNAL MALF

Brake booster control unit internal malfunction

Brake booster control unit

CCS

C1A31 BCU INTERNAL MALF

CCS-109

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C

D

E

F

G

H

I

J

K

L

M

B

N

P

A

2.

Check that the ICC system is normal. 

>> WORK END

CCS-110

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C1A32 IBA FLAG STUCK

C1A32 IBA FLAG STUCK

Description

INFOID:0000000005501668

ICC sensor integrated unit shares components with the IBA system. 

DTC Logic

INFOID:0000000005501669

DTC DETECTION LOGIC

NOTE:
If DTC “C1A32” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

CCS-137,

"DTC Logic"

. 

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Wait for approximately 5 minutes or more after turning the MAIN switch of ICC system ON. 

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “C1A32” is detected as the current malfunction in “Self Diagnostic Result” of “ICC”. 

Is “C1A32” detected as the current malfunction?

YES

>> Refer to 

CCS-110, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501670

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “C1A32” in “Self Diagnostic Result” of “ICC”. 

Is “U1000” detected?

YES

>> Perform the CAN communication system inspection. Repair or replace the malfunctioning parts.

Refer to 

CCS-137, "DTC Logic"

. 

NO

>> GO TO 2.

2.

REPLACE BRAKE BOOSTER CONTROL UNIT

1.

Turn the ignition switch OFF.

2.

Replace the brake booster control unit. 

3.

Erases All self-diagnosis results. 

4.

Perform DTC confirmation procedure. Refer to 

CCS-110, "DTC Logic"

.

5.

Perform “All DTC Reading”. 

6.

Check if the “C1A32” is detected in “Self Diagnostic Result” of “ICC”. 

Is “C1A32” detected?

YES

>> Replace the ICC sensor integrated unit. Refer to 

CCS-184, "Exploded View"

.

NO

>> INSPECTION END

Special Repair Requirement

INFOID:0000000005501671

DESCRIPTION

Perform the action test after adjusting the laser beam aiming of ICC sensor integrated unit when the following
operation is performed. 
• Removal and installation of ICC sensor integrated unit
• Replacement of ICC sensor integrated unit

SPECIAL REPAIR REQUIREMENT

DTC

(On board dis-

play)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A32

(32)

IBA FLAG STUCK

If the control (detection) of IBA is malfunction-
ing

• ICC sensor integrated unit
• Brake booster control unit

CCS

C1A32 IBA FLAG STUCK

CCS-111

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C

D

E

F

G

H

I

J

K

L

M

B

N

P

A

1.

LASER BEAM AIMING ADJUSTMENT OF ICC SENSOR INTEGRATED UNIT

Adjust the laser beam aiming of the ICC sensor integrated unit. Refer to 

CCS-13, "LASER BEAM AIMING

ADJUSTMENT : Description"

. 

>> GO TO 2.

2.

CHECK ICC SYSTEM

1.

Erase the “Self Diagnostic Result”, and then perform “All DTC Reading” again after performing the action
test. (Refer to 

CCS-18, "ACTION TEST : Description"

 for action test.)

2.

Check that the ICC system is normal. 

>> WORK END