Infiniti FX35, FX50 (S51). Manual - part 319

CCS-96

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C1A18 LASER AIMING INCMP

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

CCS

C1A21 UNIT HIGH TEMP

CCS-97

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

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C1A21 UNIT HIGH TEMP

Description

INFOID:0000000005501644

ICC sensor integrated unit integrates the temperature sensor. 

DTC Logic

INFOID:0000000005501645

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn the ignition switch OFF.

2.

Wait for 10 minutes or more to cool the ICC sensor integrated unit. 

3.

Start the engine.

4.

Turn the MAIN switch of ICC system ON. 

5.

Perform “All DTC Reading” with CONSULT-III. 

6.

Check if the “C1A21” is detected as the current malfunction in “Self Diagnostic Result” of “ICC”. 

Is “C1A21” detected as the current malfunction?

YES

>> Refer to 

CCS-97, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000005501646

1.

CHECK ENGINE COOLING SYSTEM

Check for any malfunctions in engine cooling system. 

Is engine cooling system normal?

YES

>> Replace the ICC sensor integrated unit. Refer to 

CCS-184, "Exploded View"

. 

NO

>> Repair engine cooling system. 

Special Repair Requirement

INFOID:0000000005501647

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.)

2.

Check that the ICC system is normal. 

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A21

(21)

UNIT HIGH TEMP

If the temperature sensor (integrated in the ICC 
sensor integrated unit) detects a high temperature

Temperature around ICC sensor inte-
grated unit is excessively high

CCS-98

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C1A21 UNIT HIGH TEMP

>> WORK END

CCS

C1A22 BCU CIRCUIT

CCS-99

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

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C1A22 BCU CIRCUIT

Description

INFOID:0000000005501648

• The brake booster control unit 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. 

• The brake booster adjusts the brake fluid pressure by driving the booster solenoid. 
• The brake pedal is controlled when the brake booster adjusts the brake fluid pressure. 

DTC Logic

INFOID:0000000005501649

DTC DETECTION LOGIC

NOTE:
If DTC “C1A22” is detected along with DTC “U1000”, or “C1A05”, first diagnose the DTC “U1000”, or “C1A05”. 
• Refer to 

CCS-137, "DTC Logic"

 for DTC “U1000”.

• Refer to 

CCS-61, "DTC Logic"

 for DTC “C1A05”.

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 “C1A22” is detected as the current malfunction in “Self Diagnostic Result” of “ICC”. 

Is “C1A22” detected as the current malfunction?

YES

>> Refer to 

CCS-99, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501650

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “C1A05” or “U1000” is detected other than “C1A22” 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

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH

Check that “STOP LAMP SW” and “BRAKE SW” operate normally in “DATA MONITOR” of “ICC”. 

Is the inspection result normal?

YES

>> GO TO 10.

NO-1

>> When “BRAKE SW” operation is malfunctioning: GO TO 3.

NO-2

>> When “STOP LAMP SW” operation is malfunctioning: GO TO 5.

3.

CHECK ICC BRAKE SWITCH INSTALLATION

1.

Turn the ignition switch OFF.

DTC

(On board 

display)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A22

(22)

BCU CIRCUIT

If the brake booster control unit cannot control 
the brake booster

• Stop lamp switch circuit
• ICC brake switch circuit
• Stop lamp switch
• ICC brake switch
• Incorrect stop lamp switch installation
• Incorrect ICC brake switch installa-

tion

• ECM
• Brake booster control unit