Infiniti QX56 (Z62). Manual - part 1083

 

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Infiniti QX56 (Z62). Manual - part 1083

 

 

SBC-32

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

2.

STUDY AND UNDERSTAND THE SYSTEM DESCRIPTION

Understand the operation condition or non-operation condition of pre-crash seat belt. Refer to 

SBC-7, "PRE-

CRASH SEAT BELT SYSTEM : System Description"

.

>> GO TO 3.

3.

CHECK DTC

Perform “Self-diagnosis procedure” of appropriate DTC to check if DTC is detected again.
At this time, always connect CONSULT-III to the vehicle, and then check the diagnosis results in real time on
“DATA MONITOR (AUTO RECORD)”.
There is no priority for each DTC. Record them based on the following rules.
Current malfunction: Record all DTCs detected.
Past malfunction: Record up to 5 DTCs. When the 6th DTC is detected, it is overwritten to the first recorded
DTC.

Is DTC detected? 

YES

>> GO TO 4.

NO

>> GO TO 5.

4.

PERFORM DTC CONFIRMATION PROCEDURE

Perform the inspection with “DTC REPRODUCTION PROCEDURE” of the applicable system.

YES

>> GO TO 6.

NO

>> Check intermittent incident.Refer to 

GI-40, "Intermittent Incident"

.

5.

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS

Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step
3, and determine the trouble diagnosis order based on possible causes and symptom.

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE

Identify the malfunctioning part with “Diagnosis Procedure”.

>> GO TO 7.

7.

REPAIR OR REPLACE THE MALFUNCTIONING PART

Repair or replace the specified malfunctioning parts.

>> GO TO 8.

8.

FINAL CHECK

Perform “CONSULT-III function” again to check that the repair is performed correctly.
Check that malfunctions are not reproduced when obtaining the malfunction information from the customer,
referring to the symptom inspection result in step 3.
Are all malfunctions corrected?

YES

>> INSPECTION END

NO-1

>> DTC is detected: GO TO 4.

NO-2

>> Symptom remains: GO TO 5.

U0126 ST ANG SEN SIG

SBC-33

< DTC/CIRCUIT DIAGNOSIS >

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DTC/CIRCUIT DIAGNOSIS

U0126 ST ANG SEN SIG

Description

INFOID:0000000006237891

Inputs the steering angle signal from steering angle sensor via CAN communication.

DTC Logic

INFOID:0000000006237892

DTC DETECTION LOGIC

NOTE:
If DTC U0126 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

SBC-

35, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT

1.

Turn ignition switch ON.

2.

Check “Self-diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Refer to 

SBC-33, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006237893

1.

CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Check “Self-diagnostic result” for “ABS” with CONSULT-III. Refer to 

BRC-40, "CONSULT-III Function"

.

Is DTC detected?

YES

>> Repair or replace malfunctioning parts.

NO

>> GO TO 2.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Self-diagnosis item

DTC Detection Condition

Possible causes

U0126

ST ANG SEN SIG 

 Receipt of a malfunction signal of Steering angle signal

Steering angle sensor 

SBC-34

< DTC/CIRCUIT DIAGNOSIS >

U0428 STRG ANGL CAL

U0428 STRG ANGL CAL

Description

INFOID:0000000006237894

Inputs the steering calibration incomplete signal from steering angle sensor via CAN communication.

DTC Logic

INFOID:0000000006237895

DTC DETECTION LOGIC

NOTE:
If DTC U0428 is displayed with DTC U0126, first perform the trouble diagnosis for DTC U0126. Refer to 

SBC-

33, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT

1.

Turn ignition switch ON.

2.

Check “Self-diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Refer to 

SBC-34, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006237896

1.

CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Check “Self-diagnostic result” for “ABS” with CONSULT-III. Refer to 

BRC-40, "CONSULT-III Function"

.

Is DTC detected?

YES

>> Repair or replace malfunctioning parts.

NO

>> GO TO 2.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Self-diagnosis item

DTC Detection Condition

Possible causes

U0428

STRG ANGL CAL

Receipt of the calibration incomplete signal

 Steering angle sensor calibration incomplete

U1000 CAN COMM CIRCUIT

SBC-35

< DTC/CIRCUIT DIAGNOSIS >

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000006237897

• CAN (Controller Area Network) is a serial communication line for real time applications. It is an on board

multiplex communication line with high data communication speed and excellent error detection ability. A
modern vehicle is equipped with many ECMs, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, two control units are connected
with two communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with
less wiring. Each control unit transmits/receives data but selectively reads required data only.

• It transmits the vehicle status to pre-crash seat belt control unit using the CAN communication system.
• It consists of CAN system (unified meter and A/C amp., ICC sensor, BCM, steering angle sensor).
• Refer to 

LAN-27, "CAN COMMUNICATION SYSTEM : CAN System Specification Chart"

.

DTC Logic

INFOID:0000000006237898

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT

1.

Turn ignition switch ON and wait for 2 seconds or more.

2.

Check “Self-diagnostic result” with CONSULT-III.

Is any DTC detected?

YES

>> Refer to 

LAN-27, "CAN COMMUNICATION SYSTEM : CAN System Specification Chart"

.

NO

>> CAN communication system is normal.

DTC No.

Self-diagnosis item

DTC Detection Condition

Possible causes

U1000

CAN communication 
circuit

Pre-crash seat belt control unit cannot transmit and re-
ceive CAN communication system for 2 seconds or 
more. 

• Harness or connectors

(CAN communication line is open 
or shorted) 

 

 

 

 

 

 

 

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