Infiniti QX56 (Z62). Manual - part 205

CCS

C1A03 VEHICLE SPEED SENSOR

CCS-87

< DTC/CIRCUIT DIAGNOSIS >

[ICC]

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C1A03 VEHICLE SPEED SENSOR

DTC Logic

INFOID:0000000006224308

DTC DETECTION LOGIC

NOTE:
If DTC “C1A03” is detected along with DTC “U1000” or “C1A04”, first diagnose the DTC “U1000” or “C1A04”. 
• Refer to 

CCS-145, "ADAS CONTROL UNIT : DTC Logic"

 for DTC “U1000”.

• Refer to 

CCS-89, "DTC Logic"

 for DTC “C1A04”.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the MAIN switch of ICC system ON. 

3.

Drive the vehicle at 30 km/h (19 MPH) or more. 

CAUTION:

Always drive safely. 

4.

Stop the vehicle.

5.

Perform “All DTC Reading” with CONSULT-III. 

6.

Check if the “C1A03” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “C1A03” detected as the current malfunction?

YES

>> Refer to 

CCS-87, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000006224309

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “C1A04” or “U1000” is detected other than “C1A03” in “Self Diagnostic Result” of “ICC/ADAS”. 

Is any DTC detected?

YES

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

CCS-50, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK DATA MONITOR

1.

Start the engine.

2.

Drive the vehicle. 

3.

Check that the value of “VHCL SPD AT” is almost the same as the value of “VHCL SPEED SE” in “DATA
MONITOR” of “ICC/ADAS”. 

CAUTION:

Be careful of the vehicle speed. 

Is the inspection result normal?

YES

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

NO

>> GO TO 3.

3.

CHECK TCM SELF-DIAGNOSIS RESULTS

1.

Perform “All DTC Reading”. 

2.

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

DTC

(On board 

display)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A03

(3)

VHCL SPEED SE 
CIRC

If the vehicle speed signal (wheel speed) from 
ABS actuator and electric unit (control unit) and 
the A/T vehicle speed sensor signal (output 
shaft revolution signal) from TCM, received by 
the ADAS control unit via CAN communication, 
are inconsistent

• Wheel speed sensor
• ABS actuator and electric unit (control 

unit)

• Vehicle speed sensor A/T (output speed 

sensor)

• TCM
• ADAS control unit

CCS-88

< DTC/CIRCUIT DIAGNOSIS >

[ICC]

C1A03 VEHICLE SPEED SENSOR

Is any DTC detected?

YES

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

TM-78, "DTC Index"

.

NO

>> GO TO 4.

4.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS RESULTS

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

Is any DTC detected?

YES

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

BRC-51, "DTC Index"

. 

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

CCS

C1A04 ABS/TCS/VDC SYSTEM

CCS-89

< DTC/CIRCUIT DIAGNOSIS >

[ICC]

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C1A04 ABS/TCS/VDC SYSTEM

DTC Logic

INFOID:0000000006224310

DTC DETECTION LOGIC

NOTE:
If DTC “C1A04” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

CCS-145,

"ADAS CONTROL UNIT : DTC Logic"

. 

Diagnosis Procedure

INFOID:0000000006224311

1.

CHECK SELF-DIAGNOSIS RESULTS

1.

Perform “All DTC Reading” with CONSULT-III. 

2.

Check if the “U1000” is detected other than “C1A04” in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U1000” detected?

YES

>> Perform the CAN communication system inspection. Repair or replace the malfunctioning parts.

Refer to 

CCS-145, "ADAS CONTROL UNIT : DTC Logic"

. 

NO

>> GO TO 2.

2.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS RESULTS

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

Is any DTC detected?

YES

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

BRC-51, "DTC Index"

.

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A04

(4)

ABS/TCS/VDC CIRC

If a malfunction occurs in the VDC/TCS/ABS 
system

ABS actuator and electric unit (control 
unit)

CCS-90

< DTC/CIRCUIT DIAGNOSIS >

[ICC]

C1A05 BRAKE SW/STOP LAMP SW

C1A05 BRAKE SW/STOP LAMP SW

DTC Logic

INFOID:0000000006224312

DTC DETECTION LOGIC

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

CCS-145,

"ADAS CONTROL UNIT : DTC Logic"

. 

Diagnosis Procedure

INFOID:0000000006224313

1.

CHECK SELF-DIAGNOSIS RESULTS

1.

Perform “All DTC Reading” with CONSULT-III. 

2.

Check if the “U1000” is detected other than “C1A05” in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U1000” detected?

YES

>> Perform the CAN communication system inspection. Repair or replace the malfunctioning parts.

Refer to 

CCS-145, "ADAS CONTROL UNIT : DTC Logic"

. 

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/ADAS”. 

Is the inspection result normal?

YES

>> GO TO 3.

NO-1

>> When “BRAKE SW” operation is malfunctioning: GO TO 4.

NO-2

>> When “STOP LAMP SW” operation is malfunctioning: GO TO 9.

3.

CHECK STOP LAMP SWITCH

Check that “STOP LAMP SW” operate normally in “DATA MONITOR” of “ABS”. 

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> GO TO 9.

4.

CHECK ICC BRAKE SWITCH INSTALLATION

1.

Turn ignition switch OFF.

2.

Check ICC brake switch for correct installation. Refer to 

BR-7, "Inspection and Adjustment"

. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Adjust ICC brake switch installation. Refer to 

BR-7, "Inspection and Adjustment"

. 

5.

ICC BRAKE SWITCH INSPECTION

1.

Disconnect ICC brake switch connector. 

2.

Check ICC brake switch. Refer to 

CCS-93, "Component Inspection (ICC Brake Switch)"

. 

Is the inspection result normal?

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A05

(5)

BRAKE SW/STOP L 
SW

A mismatch between a stop lamp switch signal 
and a ICC brake switch signal received from 
ECM and a stop lamp signal received from the 
ABS actuator and electric unit (control unit) con-
tinues for 10 seconds or more with vehicle 
speeds at approximately 40 km/h or more

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

tion

• Incorrect ICC brake switch installa-

tion

• ECM
• ABS actuator and electric unit (con-

trol unit)