Infiniti FX35, FX50 (S51). Manual - part 370

CCS-300

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

U0126 STRG SEN CAN 1

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

U0129 BCU CAN 2

CCS-301

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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U0129 BCU CAN 2

Description

INFOID:0000000005501945

The brake booster control unit transmits the signal related to brake control to ICC sensor integrated unit via
ITS communication. 

DTC Logic

INFOID:0000000005501946

DTC DETECTION LOGIC

NOTE:
If DTC “U0129” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

CCS-313, "ICC

SENSOR INTEGRATED UNIT : DTC 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 “U0129” is detected as the current malfunction in self-diagnosis results of “ICC”. 

Is “U0129” detected as the current malfunction?

YES

>> Refer to 

CCS-301, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501947

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “U0129” 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-313, "ICC SENSOR INTEGRATED UNIT : DTC Logic"

. 

NO

>> GO TO 2.

2.

REPLACE BRAKE BOOSTER CONTROL UNIT

1.

Turn ignition switch OFF.

2.

Replace brake booster control unit. 

3.

Erases All self-diagnosis results. 

4.

Perform DTC confirmation procedure. Refer to 

CCS-301, "DTC Logic"

. 

5.

Perform “All DTC Reading”. 

6.

Check if the “U0129” is detected in “Self Diagnostic Result” of “ICC”. 

Is “U0129” detected?

YES

>> Replace the ICC sensor integrated unit. Refer to 

CCS-380, "Exploded View"

. 

NO

>> INSPECTION END

Special Repair Requirement

INFOID:0000000005501948

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

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

U0129

(125)

BCU CAN CIR 2

If ICC sensor integrated unit detects an error 
signal that is received from brake booster con-
trol unit via ITS communication

Brake booster control unit

CCS-302

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

U0129 BCU CAN 2

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

U0401 ECM CAN 1

CCS-303

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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U0401 ECM CAN 1

Description

INFOID:0000000005501949

ECM transmits the signal related to engine control [DCA system] to ICC sensor integrated unit via CAN com-
munication. 

DTC Logic

INFOID:0000000005501950

DTC DETECTION LOGIC

NOTE:
If DTC “U0401” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

CCS-313, "ICC

SENSOR INTEGRATED UNIT : DTC 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 “U0401” is detected as the current malfunction in self-diagnosis results of “ICC”. 

Is “U0401” detected as the current malfunction?

YES

>> Refer to 

CCS-303, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501951

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “U0401” 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-313, "ICC SENSOR INTEGRATED UNIT : DTC Logic"

. 

NO

>> GO TO 2.

2.

CHECK ECM SELF-DIAGNOSIS RESULTS

Check if any DTC is detected in “Self Diagnostic Result” of “ENGINE”. 

Is any DTC detected?

YES

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

EC-541, "DTC Index"

 (VQ35HR) or 

EC-1179, "DTC Index"

 (VK50VE). 

NO

>> Replace the ICC sensor integrated unit. Refer to 

CCS-380, "Exploded View"

. 

Special Repair Requirement

INFOID:0000000005501952

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

DTC

(On board 

display)

Trouble diagnosis name

DTC detecting condition

Possible causes

U0401

(120)

ECM CAN CIR1

If ICC sensor integrated unit detects an error 
signal that is received from ECM via CAN 
communication

ECM