Infiniti FX35, FX50 (S51). Manual - part 357

CCS-248

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C1A15 GEAR POSITION

C1A15 GEAR POSITION

Description

INFOID:0000000005501839

ICC sensor integrated unit judges the gear position based on the following signals. 
• Shift position signal transmitted from TCM via CAN communication. 
• Value of gear ratio calculated from input speed signal transmitted from TCM via CAN communication.
• Value of gear ratio calculated from the vehicle speed signal transmitted from ABS actuator and electric unit

(control unit) via CAN communication. 

DTC Logic

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DTC DETECTION LOGIC

NOTE:
If DTC “C1A15” is detected along with DTC “U1000”, “C1A03” or “C1A04”, first diagnose the DTC “U1000”,
“C1A03” or “C1A04”. 
• Refer to 

CCS-313, "ICC SENSOR INTEGRATED UNIT : DTC Logic"

 for DTC “U1000”.

• Refer to 

CCS-215, "DTC Logic"

 for DTC “C1A03”.

• Refer to 

CCS-217, "DTC Logic"

 for DTC “C1A04”.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the DCA system ON. 

3.

Drive the vehicle at 10 km/h (6 MPH) or faster for approximately 15 minutes or more. 

CAUTION:

Always drive safely. 

4.

Stop the vehicle.

5.

Perform “All DTC Reading” with CONSULT-III. 

6.

Check if the “C1A15” is detected as the current malfunction in the self-diagnosis results of “ICC”. 

Is “C1A15” detected as the current malfunction?

YES

>> Refer to 

CCS-248, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-36, "Intermittent Incident"

. 

Diagnosis Procedure

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1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “C1A03”, “C1A04”, or “U1000” is detected other than “C1A15” 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-341, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK VEHICLE SPEED SIGNAL

Check that “VHCL SPEED SE” operates normally in “DATA MONITOR” of “ICC”. 

CAUTION:

Be careful of the vehicle speed. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 7.

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A15

(15)

GEAR POSITION

If a mismatch occurs between an shift posi-
tion signal transmitted from TCM via CAN 
communication and the gear position calcu-
lated by ICC sensor integrated unit

• Input speed sensor
• Vehicle speed sensor A/T (output speed 

sensor)

• TCM

CCS

C1A15 GEAR POSITION

CCS-249

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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3.

CHECK GEAR POSITION

Check that “GEAR” operates normally in “DATA MONITOR” of “ICC”. 

CAUTION:

Be careful of the vehicle speed. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK GEAR POSITION SIGNAL

Check that “GEAR” operates normally in “DATA MONITOR” of “TRANSMISSION”. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 6.

5.

CHECK INPUT SPEED SENSOR SIGNAL

Check that “INPUT SPEED” operates normally in “DATA MONITOR” of “TRANSMISSION”. 
Is the inspection result normal?

YES

>> Replace the ICC sensor integrated unit. Refer to 

CCS-380, "Exploded View"

. 

NO

>> GO TO 6.

6.

CHECK TCM SELF-DIAGNOSIS RESULTS

1.

Perform “All DTC Reading”. 

2.

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

Is any DTC detected?

YES

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

TM-150, "DTC Index"

 (VQ35HR) or 

TM-332, "DTC Index"

 (VK50VE). 

NO

>> Replace the ICC sensor integrated unit. Refer to 

CCS-380, "Exploded View"

. 

7.

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

1.

Perform “All DTC Reading”. 

2.

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-119, "DTC Index"

. 

NO

>> Replace the ICC sensor integrated unit. Refer to 

CCS-380, "Exploded View"

. 

Special Repair Requirement

INFOID:0000000005501842

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. 

CCS-250

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

C1A15 GEAR POSITION

>> WORK END

CCS

C1A16 RADAR STAIN

CCS-251

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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C1A16 RADAR STAIN

Description

INFOID:0000000005501843

ICC sensor integrated unit detects the reflected light from the vehicle ahead by irradiating a laser beam for-
ward. It calculates the distance from and relative speed with the vehicle ahead based on the detected signal. 

DTC Logic

INFOID:0000000005501844

DTC DETECTION LOGIC

NOTE:
DTC “C1A16” may be detected under the following conditions. (Explain to the customer about the difference
between the contamination detection function and the indication when the error is detected and tell them “This
is not malfunction”.)
• When contamination or foreign materials adhere on the ICC sensor integrated unit body window
• When driving while it is snowing or when frost forms on the ICC sensor integrated unit body window
• When the ICC sensor integrated unit body window is temporarily fogged

Diagnosis Procedure

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1.

VISUAL CHECK 1

Check ICC sensor integrated unit body window for contamination and foreign materials. 

Does contamination or foreign materials adhere?

YES

>> Wipe out the contamination and foreign materials from the ICC sensor integrated unit body win-

dow. 

NO

>> GO TO 2.

2.

VISUAL CHECK 2

Check ICC sensor integrated unit body window for cracks and scratches. 

Is it found?

YES

>> Replace the ICC sensor integrated unit. Refer to 

CCS-380, "Exploded View"

. 

NO

>> GO TO 3.

3.

INTERVIEW

1.

Ask if there is any trace of contamination or foreign materials adhering to the ICC sensor integrated unit
body window. 

2.

Ask if ICC sensor integrated unit body window was frosted during driving or if vehicle was driven in snow. 

3.

Ask if ICC sensor integrated unit body window was temporarily fogged. (Windshield glass may also tend
to fog, etc.)

What is the result of the interview with the customer?

YES

>> Explain to the customer about the difference between the contamination detection function and

the indication when the malfunction is detected and tell them “This is not malfunction”.

NO

>> Replace the ICC sensor integrated unit. Refer to 

CCS-380, "Exploded View"

. 

Special Repair Requirement

INFOID:0000000005501846

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

C1A16

(16)

RADAR STAIN

If any stain occurs to ICC sensor integrated 
unit body window

• Stain or foreign materials is deposit-

ed

• Cracks or scratches exist