Infiniti FX35, FX50 (S51). Manual - part 351

CCS-224

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C1A06 OPERATION SW

C1A06 OPERATION SW

Description

INFOID:0000000005548633

• Turns the DCA system ON/OFF. (When the setting of the DCA system on the navigation screen is ON.)
• The ICC steering switch signal is input to the ECM. It is transmitted from ECM to ICC sensor integrated unit

via CAN communication. 

DTC Logic

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DTC DETECTION LOGIC

NOTE:
If DTC “C1A06” 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 after turning the MAIN switch of ICC system ON. 

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “C1A06” is detected as the current malfunction in “Self Diagnostic Result” of “ICC”. 

Is “C1A06” detected as the current malfunction?

YES

>> Refer to 

CCS-224, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005548635

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “C1A06” 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 ICC STEERING SWITCH

1.

Turn the ignition switch OFF.

2.

Disconnect the ICC steering switch connector. 

3.

Check the ICC steering switch. Refer to 

CCS-225, "Component Inspection"

. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace the ICC steering switch. 

3.

CHECK HARNESS BETWEEN SPIRAL CABLE AND ECM

1.

Disconnect the ECM connector. 

2.

Check for continuity between the spiral cable harness connector and ECM harness connector. 

VQ35HR

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A06

(6)

OPERATION SW 
CIRC

If the input signal from ICC steering switch is 
malfunctioning

• ICC steering switch circuit
• ICC steering switch
• ECM

Spiral cable

ECM

Continuity

Connector

Terminal

Connector

Terminal

CCS

C1A06 OPERATION SW

CCS-225

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C

D

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F

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H

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A

VK50VE

3.

Check for continuity between spiral cable harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair the harnesses or connectors.

4.

CHECK SPIRAL CABLE

Check for continuity between spiral cable terminals. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace the spiral cable. 

5.

PERFORM SELF-DIAGNOSIS OF ECM

1.

Connect the connectors of ICC steering switch and ECM connector. 

2.

Turn the ignition switch ON.

3.

Perform “All DTC Reading”. 

4.

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

Is any DTC detected?

YES

>> Perform self-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-184, "Exploded View"

. 

Component Inspection

INFOID:0000000005548636

1.

CHECK ICC STEERING SWITCH

Check resistance between ICC steering switch terminals. 

M36

25

M107

101

Existed

32

108

Spiral cable

ECM

Continuity

Connector

Terminal

Connector

Terminal

M36

25

M160

102

Existed

32

111

Spiral cable

Ground

Continuity

Connector

Terminal

M36

25

Not existed

32

Spiral cable

Continuity

Terminal

13

25

Existed

16

32

JSOIA0141GB

CCS-226

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C1A06 OPERATION SW

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the ICC steering switch. 

Special Repair Requirement

INFOID:0000000005548639

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

Terminal

Switch operation

Resistance 

[

Ω

]

13

16

When pressing MAIN switch

Approx. 0

When pressing LDP/DCA switch

Approx. 267

When pressing CANCEL switch

Approx. 615

When pressing DISTANCE switch

Approx. 

1090

When pressing SET/COAST switch

Approx. 

1805

When pressing RESUME/ACCELERATE 
switch

Approx. 

2985

When all switches are not pressed

Approx. 

5415

CCS

C1A08 PRESSURE SENSOR

CCS-227

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C

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C1A08 PRESSURE SENSOR

Description

INFOID:0000000005501807

• The brake pressure sensor detects the brake fluid pressure value in the brake master cylinder and outputs

the value to the brake booster control unit. 

• The brake booster control unit receives the brake fluid pressure command signal from the ICC sensor inte-

grated unit via ITS communication and controls the brake fluid pressure while feeding back the brake fluid
pressure value (brake fluid pressure control signal). 

DTC Logic

INFOID:0000000005501808

DTC DETECTION LOGIC

NOTE:
If DTC “C1A08” 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 that the “C1A08” is detected as the current malfunction in self-diagnosis results of “ICC”. 

Is “C1A08” detected as the current malfunction?

YES

>> Refer to 

CCS-227, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000005501809

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “C1A08” 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 HARNESS BETWEEN BRAKE BOOSTER CONTROL UNIT AND BRAKE PRESSURE SENSOR

1.

Turn the ignition switch OFF.

2.

Disconnect connectors of brake booster control unit and brake pressure sensor. 

3.

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

4.

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

DTC

(On board 

display)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A08

(8)

PRESS SEN CIRCUIT

If the brake pressure sensor value that is input 
to the brake booster control unit is malfunc-
tioning

• Brake pressure sensor circuit
• Brake pressure sensor
• Brake booster control unit

Brake booster control unit

Brake pressure sensor

Continuity

Connector

Terminal

Connector

Terminal

B250

8

E45

3

Existed

17

2

24

1