Infiniti FX35, FX50 (S51). Manual - part 361

CCS-264

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C1A28 BCU POWER SUPPLY CIRCUIT, C1A29 BCU POWER SUPPLY 

CIRCUIT2

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 DCA SYSTEM

1.

Erase the “self-diagnosis results”, and then perform “All DTC Reading” again after performing the action
test. (Refer to 

CCS-191, "ACTION TEST : Description"

 for action test.)

2.

Check that the DCA system is normal. 

>> WORK END

CCS

C1A30 BCU CAN COMM CIRC

CCS-265

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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C1A30 BCU CAN COMM CIRC 

Description

INFOID:0000000005501867

The brake booster control unit communicates with ICC sensor integrated unit for brake booster control via ITS
communication. 

DTC Logic

INFOID:0000000005501868

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000005501869

1.

PERFORM THE SELF-DIAGNOSIS

1.

Start the engine.

2.

Turn the DCA system ON. 

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “C1A30” is detected as the current malfunction in self-diagnosis results of “ICC”. 

Is “C1A30” detected as the current malfunction?

YES

>> Perform trouble diagnosis for the ITS communication system. Refer to 

LAN-20, "Trouble Diagno-

sis Flow Chart"

. 

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Special Repair Requirement

INFOID:0000000005501870

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 DCA SYSTEM

1.

Erase the “self-diagnosis results”, and then perform “All DTC Reading” again after performing the action
test. (Refer to 

CCS-191, "ACTION TEST : Description"

 for action test.)

2.

Check that the DCA system is normal. 

>> WORK END

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A30

(30)

BCU CAN COMM CIRC

If ICC sensor integrated unit receives the sig-
nal for improper condition for brake booster 
control unit via ITS communication

ITS communication system

CCS-266

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C1A31 BCU INTERNAL MALF

C1A31 BCU INTERNAL MALF

Description

INFOID:0000000005501871

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:0000000005501872

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the DCA system ON. 

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “C1A31” is detected as the current malfunction in self-diagnosis results of “ICC”. 

Is “C1A31” detected as the current malfunction?

YES

>> Refer to 

CCS-266, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501873

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-341, "DTC Index"

.

NO

>> Replace the brake booster control unit. 

Special Repair Requirement

INFOID:0000000005501874

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 DCA SYSTEM

1.

Erase the “self-diagnosis results”, and then perform “All DTC Reading” again after performing the action
test. (Refer to 

CCS-191, "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-267

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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2.

Check that the DCA system is normal. 

>> WORK END