Infiniti FX35, FX50 (S51). Manual - part 313

CCS-72

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C1A09 BOOSTER SOLENOID

4.

Check for continuity between brake booster control unit harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair the harnesses or connectors.

4.

CHECK BOOSTER SOLENOID

Check the booster solenoid. Refer to 

CCS-72, "Component Inspection"

. 

Is the inspection result normal?

YES

>> Replace the brake booster control unit. 

NO

>> Replace the brake booster. 

Component Inspection

INFOID:0000000005501607

1.

CHECK BRAKE BOOSTER (BOOSTER SOLENOID)

Check resistance between brake booster (booster solenoid) termi-
nals. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the brake booster. 

Special Repair Requirement

INFOID:0000000005501608

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.)

Brake booster control unit

Brake booster

Continuity

Connector

Terminal

Connector

Terminal

B250

10

E44

4

Existed

12

6

Brake booster control unit

Ground

Continuity

Connector

Terminal

B250

10

Not existed

12

Brake booster

Resistance

Terminal

4

6

Approx. 1.4 

Ω

JPOIA0160GB

CCS

C1A09 BOOSTER SOLENOID

CCS-73

< 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-74

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C1A10 RELEASE SWITCH

C1A10 RELEASE SWITCH

Description

INFOID:0000000005501609

• The release switch is integrated with the brake booster. 
• The release switch detects that the driver depresses the brake pedal, and it outputs the signal to the brake

booster control unit. 

• The brake booster control unit transmits the release switch signal [release switch NO signal (normal open),

release switch NC signal (normal close)] to the ICC sensor integrated unit via ITS communication. 

DTC Logic

INFOID:0000000005501610

DTC DETECTION LOGIC

NOTE:
If DTC “C1A10” 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)

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 “C1A10” is detected as the current malfunction in “Self Diagnostic Result” of “ICC”. 

Is “C1A10” detected as the current malfunction?

YES

>> Refer to 

CCS-74, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE (2)

1.

Depress the brake pedal strongly 10 times or more. 

2.

Perform “All DTC Reading”. 

3.

Check if the “C1A10” is detected as the current malfunction in “Self Diagnostic Result” of “ICC”. 

Is “C1A10” detected as the current malfunction?

YES

>> Refer to 

CCS-74, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501611

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “C1A10” 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.

CHECK HARNESS BETWEEN BRAKE BOOSTER (RELEASE SWITCH) AND BRAKE BOOSTER CON-

TROL UNIT

1.

Turn the ignition switch OFF.

2.

Disconnect connectors of brake booster and brake booster control unit. 

3.

Check for continuity between the brake booster control unit harness connector and brake booster harness
connector. 

DTC

(On board dis-

play)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A10

(10)

RELEASE SW CIRC

If the release switch NO signal and the release 
switch NC signal, received from the brake 
booster control unit via ITS communication, 
are inconsistent

• Release switch
• Release switch circuit
• Brake booster control unit

CCS

C1A10 RELEASE SWITCH

CCS-75

< DTC/CIRCUIT DIAGNOSIS >

[ICC (FULL SPEED RANGE)]

C

D

E

F

G

H

I

J

K

L

M

B

N

P

A

4.

Check for continuity between brake booster control unit harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair the harnesses or connectors.

3.

CHECK RELEASE SWITCH POWER SUPPLY CIRCUIT

1.

Connect the brake booster control unit connector. 

2.

Turn the ignition switch ON.

3.

Check voltage between brake booster control unit harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace the brake booster control unit. 

4.

CHECK RELEASE SWITCH

Check the release switch. Refer to 

CCS-75, "Component Inspection"

. 

Is the inspection result normal?

YES

>> Replace the brake booster control unit. 

NO

>> Replace the brake booster.

Component Inspection

INFOID:0000000005501612

1.

CHECK BRAKE BOOSTER (RELEASE SWITCH)

Check for continuity between brake booster (release switch) termi-
nals. 

NOTE:

If the depressing force is weak, it may not be changed. 

Brake booster control unit

Brake booster

Continuity

Connector

Terminal

Connector

Terminal

B250

6

E44

1

Existed

15

3

22

2

Brake booster control unit

Ground

Continuity

Connector

Terminal

B250

6

Not existed

15

22

Terminal

Voltage

(Approx.)

(+)

(–)

Brake booster control unit

Ground

Connector

Terminal

B250

6

10 V

Condition

1 – 3

1 – 2

2 – 3

Brake pedal not de-
pressed

Continuity

No continuity

No continuity

Brake pedal depressed

No continu-

ity

NOTE

Continuity

NOTE

No continuity

JPOIA0160GB