Infiniti QX56 (Z62). Manual - part 286

DAS

U0428 STRG SEN CAN 2

DAS-181

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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U0428 STRG SEN CAN 2

DTC Logic

INFOID:0000000006228143

DTC DETECTION LOGIC

NOTE:
If DTC “U0428” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

DAS-182,

"ADAS CONTROL 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 if the “U0428” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U0428” detected as the current malfunction?

YES

>> Refer to 

DAS-181, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

Diagnosis Procedure

INFOID:0000000006228144

1.

CHECK SELF-DIAGNOSIS RESULTS

Check if “U1000” is detected other than “U0428” 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-182, "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

U0428

(131)

STRG SEN CAN CIR2

If ADAS control unit detects an error signal 
that is received from steering angle sensor via 
CAN communication

Steering angle sensor

DAS-182

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

ADAS CONTROL UNIT

ADAS CONTROL UNIT : Description

INFOID:0000000006228145

CAN COMMUNICATION

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control units, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN-H, CAN-L) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads the required data only.
CAN communication signal chart. Refer to 

LAN-28, "CAN COMMUNICATION SYSTEM : CAN Communica-

tion Signal Chart"

.

ITS COMMUNICATION

• ITS communication is a multiplex communication system. This enables the system to transmit and receive

large quantities of data at high speed by connecting control units with 2 communication lines.

• ITS communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.

ADAS CONTROL UNIT : DTC Logic

INFOID:0000000006228146

DTC DETECTION LOGIC

NOTE:
If “U1000” is detected, first diagnose the CAN communication system. 

ADAS CONTROL UNIT : Diagnosis Procedure

INFOID:0000000006228147

1.

PERFORM THE SELF-DIAGNOSIS

1.

Turn the ignition switch ON.

2.

Turn the DCA system ON, and then wait for 30 seconds or more. 

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “U1000” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U1000” detected as the current malfunction?

YES

>> Refer to 

LAN-18, "Trouble Diagnosis Flow Chart"

. 

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

ACCELERATOR PEDAL ACTUATOR

ACCELERATOR PEDAL ACTUATOR : Description

INFOID:0000000006223619

ITS COMMUNICATION

• ITS communication is a multiplex communication system. This enables the system to transmit and receive

large quantities of data at high speed by connecting control units with 2 communication lines

• ITS communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.

ACCELERATOR PEDAL ACTUATOR : DTC Logic

INFOID:0000000006223620

DTC DETECTION LOGIC

DTC

(On board 

display)

Trouble diagnosis name

DTC detecting condition

Possible causes

U1000

(100)

CAN COMM CIRCUIT

If ADAS control unit is not transmitting or receiv-
ing CAN communication signal or ITS communi-
cation signal for 2 seconds or more

• CAN communication system
• ITS communication system

DAS

U1000 CAN COMM CIRCUIT

DAS-183

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

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ACCELERATOR PEDAL ACTUATOR : Diagnosis Procedure

INFOID:0000000006223621

1.

PERFORM THE SELF-DIAGNOSIS

1.

Turn the ignition switch ON.

2.

Turn the DCA system ON, and then wait for 2 seconds or more. 

3.

Perform “All DTC Reading” with CONSULT-III. 

4.

Check if the “U1000” is detected as the current malfunction in “Self Diagnostic Result” of “ACCELE
PEDAL ACT”. 

Is “U1000” detected as the current malfunction?

YES

>> Refer to 

LAN-18, "Trouble Diagnosis Flow Chart"

. 

NO

>> Refer to 

GI-40, "Intermittent Incident"

. 

DTC

Trouble diagnosis name

DTC detecting condition

Possible causes

U1000

CAN COMM CIRCUIT

If accelerator pedal actuator is not transmitting or 
receiving ITS communication signal for 2 sec-
onds or more

ITS communication system

DAS-184

< DTC/CIRCUIT DIAGNOSIS >

[DCA]

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

ADAS CONTROL UNIT

ADAS CONTROL UNIT : Description

INFOID:0000000006228148

CAN controller controls the communication of CAN communication signal and ITS communication signal, and
the error detection.

ADAS CONTROL UNIT : DTC Logic

INFOID:0000000006228149

DTC DETECTION LOGIC

ADAS CONTROL UNIT : Diagnosis Procedure

INFOID:0000000006228150

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn the DCA system ON. 

2.

Perform “All DTC Reading” with CONSULT-III. 

3.

Check if the “U1010” is detected as the current malfunction in “Self Diagnostic Result” of “ICC/ADAS”. 

Is “U1010” detected as the current malfunction?

YES

>> Replace the ADAS control unit. Refer to 

DAS-63, "Removal and Installation"

.

NO

>> INSPECTION END

ACCELERATOR PEDAL ACTUATOR

ACCELERATOR PEDAL ACTUATOR : Description

INFOID:0000000006223625

CAN controller controls the communication of ITS communication signal and the error detection.

ACCELERATOR PEDAL ACTUATOR : DTC Logic

INFOID:0000000006223626

DTC DETECTION LOGIC

ACCELERATOR PEDAL ACTUATOR : Diagnosis Procedure

INFOID:0000000006223627

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn the DCA system ON. 

2.

Perform “All DTC Reading” with CONSULT-III. 

3.

Check if the “U1010” is detected as the current malfunction in “Self Diagnostic Result” of “ACCELE
PEDAL ACT”. 

Is “U1010” detected as the current malfunction?

YES

>> Replace the accelerator pedal actuator. Refer to 

DAS-213, "Exploded View"

.

NO

>> INSPECTION END

DTC

(On board 

display)

Trouble diagnosis name

DTC detecting condition

Possible causes

U1010

(110)

CONTROL UNIT (CAN)

If ADAS control unit detects malfunction by 
CAN controller initial diagnosis

ADAS control unit

DTC

Trouble diagnosis name

DTC detecting condition

Possible causes

U1010

CONTROL UNIT (CAN)

If accelerator pedal actuator detects malfunc-
tion by CAN controller initial diagnosis

Accelerator pedal actuator