Infiniti QX56 (Z62). Manual - part 359

DAS

C1A15 GEAR POSITION

DAS-473

< DTC/CIRCUIT DIAGNOSIS >

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C1A15 GEAR POSITION

Description

INFOID:0000000006228224

ADAS control unit judges the gear position based on the following signals. 
• Current gear 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

INFOID:0000000006228225

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 

DAS-486, "ADAS CONTROL UNIT : DTC Logic"

 for DTC “U1000”.

• Refer to 

DAS-472, "DTC Logic"

 for DTC “C1A03”.

• Refer to 

CCS-89, "DTC Logic"

 for DTC “C1A04”.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine.

2.

Turn the BSW 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 “C1A15” is detected as the current malfunction in the “Self Diagnostic Result” of “ICC/ADAS”. 

Is “C1A15” detected as the current malfunction?

YES

>> Refer to 

DAS-473, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000006228226

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “C1A03”, “C1A04”, or “U1000” is detected other than “C1A15” 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

DAS-440, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK VEHICLE SPEED SIGNAL

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

CAUTION:

Be careful of the vehicle speed. 

Is the inspection result normal?

DTC

(On board dis-

play)

Trouble diagnosis 

name

DTC detecting condition

Possible causes

C1A15

(15)

GEAR POSITION

A mismatch between an current gear posi-
tion signal transmitted from TCM via CAN 
communication and a gear position calculat-
ed by the ADAS control unit continues for 
approximately 11 minutes or more

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

sensor)

• TCM

DAS-474

< DTC/CIRCUIT DIAGNOSIS >

[BSW]

C1A15 GEAR POSITION

YES

>> GO TO 3.

NO

>> GO TO 7.

3.

CHECK GEAR POSITION

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

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 ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

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-78, "DTC Index"

. 

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

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-51, "DTC Index"

. 

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

DAS

C1A24 NP RANGE

DAS-475

< DTC/CIRCUIT DIAGNOSIS >

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C1A24 NP RANGE

DTC Logic

INFOID:0000000006228227

DTC DETECTION LOGIC

NOTE:
If DTC “C1A24” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

DAS-486,

"ADAS CONTROL UNIT : DTC Logic"

. 

DTC CONFIRMATION PROCEDURE

1.

CHECK DTC REPRODUCE (1)

1.

Start the engine.

2.

Turn the BSW system ON. 

3.

Wait for approximately 5 minutes or more after shifting the selector lever to “P” position. 

4.

Perform “All DTC Reading” with CONSULT-III. 

5.

Check if the “C1A24” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “C1A24” detected as the current malfunction?

YES

>> Refer to 

DAS-475, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

CHECK DTC REPRODUCE (2)

1.

Wait for approximately 5 minutes or more after shifting the selector lever to “N” position. 

2.

Perform “All DTC Reading”. 

3.

Check if the “C1A24” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “C1A24” detected as the current malfunction?

YES

>> Refer to 

DAS-475, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000006228228

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “C1A24” 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 

DAS-486, "ADAS CONTROL UNIT : DTC Logic"

. 

NO

>> GO TO 2.

2.

CHECK NP POSITION SWITCH SIGNAL

Check that “NP RANGE SW” operates normally in “DATA MONITOR” of “ICC/ADAS”. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

3.

CHECK TCM DATA MONITOR

Check that “SLCT LVR POSI” operates normally in “DATA MONITOR” of “TRANSMISSION”. 

Is the inspection result normal?

YES

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

. 

NO

>> GO TO 4.

DTC

(On board dis-

play)

Trouble diagnosis name

DTC detecting condition

Possible causes

C1A24

(24)

NP RANGE

A mismatch between a shift position signal 
transmitted from TCM via CAN communica-
tion and an current gear position signal contin-
ues for 60 seconds or more

• TCM
• Transmission range switch

DAS-476

< DTC/CIRCUIT DIAGNOSIS >

[BSW]

C1A24 NP RANGE

4.

PERFORM TCM SELF-DIAGNOSIS

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-78, "DTC Index"

.

NO

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

.