Infiniti G37 Coupe. Manual - part 659

EXL-56

< COMPONENT DIAGNOSIS >

[XENON TYPE]

C0126 STEERING ANGLE SENSOR SIGNAL

C0126 STEERING ANGLE SENSOR SIGNAL

Description

INFOID:0000000001604639

AFS control unit receives the steering angle sensor signal from the steering angle sensor with CAN communi-
cation.

DTC Logic

INFOID:0000000001604640

DTC DETECTION LOGIC

[C0126] Steering angle sensor signal

DTC CONFIRMATION PROCEDURE

1.

DTC ERASE

Erase the DTC memory of AFS with CONSULT-III.

>> GO TO 2.

2.

DTC CONFIRMATION

1.

Start the engine.

2.

Turn the steering wheel to the maximum right/left.

3.

Select the self-diagnosis with CONSULT-III.

Is “C0126” detected?

YES

>> Refer to 

EXL-56, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-38, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000001604641

1.

ABS ACTUATOR AND ELECTRICAL UNIT (CONTROL UNIT) SELF-DIAGNOSIS

Check the self-diagnosis result with CONSULT-III. Check that ABS actuator and electrical unit (control unit)
does not detect any DTCs.
Is any DTC detected?

YES

>> Check ABS actuator and electrical unit (control unit).Refer to 

BRC-88, "DTC No. Index"

.

NO

>> GO TO 2.

2.

DTC ERASE

Erase DTC memory of AFS with CONSULT-III.
Is the memory erased?

YES

>> Inspection end.

NO

>> Replace AFS control unit.

DTC detection condition

DTC erase condition

Possible causes

In any of the following conditions
• The steering angle sensor signal is not received.
• The steering angle sensor signal error is received.
• Out-of-standard signal (-900

°

- +900

°

) is received.

The ignition switch OFF

• Steering angle sensor
• AFS  control  unit

C0428 STEERING ANGLE SENSOR CALIBRATION

EXL-57

< COMPONENT DIAGNOSIS >

[XENON TYPE]

C

D

E

F

G

H

I

J

K

M

A

B

EXL

N

O

P

C0428 STEERING ANGLE SENSOR CALIBRATION

Description

INFOID:0000000001604642

AFS control unit receives the steering angle sensor signal from the steering angle sensor with CAN communi-
cation.

DTC Logic

INFOID:0000000001604643

[C0428] Steering angle sensor calibration

Diagnosis Procedure

INFOID:0000000001604644

1.

STEERING ANGLE SENSOR NEUTRAL POSITION ADJUSTMENT

Perform the steering angle sensor neutral position adjustment.

CAUTION:

Perform the steering angle sensor neutral position adjustment on VDC side. VDC may activate incor-
rectly.

>> Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Spe-

cial Repair Requirement"

.

DTC detection condition

DTC erase condition

Possible causes

The steering angle sensor neutral position is not recog-
nized.

When the steering angle sensor 
neutral position registration is 
completed

Steering angle sensor

EXL-58

< COMPONENT DIAGNOSIS >

[XENON TYPE]

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000001604645

CAN (Controller Area Network) is the serial transmission for real time application. CAN is the multiplex com-
munication for the vehicle with superior data transmission speed and error detection ability. Many electronic
control units are equipped on the vehicle. These control units do not operate individually, but associates with
other control units by sharing information. In CAN communication, each control unit is connected with two
communication lines (CAN-H and CAN-L). Much information is transmitted with fewer communication lines
than before. Each control unit transmits/receives data and reads the necessary data only. 

DTC Logic

INFOID:0000000001604646

DTC DETECTION LOGIC

[U1000] CAN communication circuit

Diagnosis Procedure

INFOID:0000000001604647

1.

PERFORM SELF DIAGNOSTIC

1.

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

2.

Check “Self Diagnostic Result”.

Is “CAN COMM CIRCUIT” displayed?

YES

>> Refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

NO

>> Refer to 

GI-38, "Intermittent Incident"

.

DTC detection condition

DTC erase condition

Possible causes

When AFS control unit does not transmit/receive CAN com-
munication signal continuously for 2 seconds or more

Ignition switch OFF

One or more following items of CAN com-
munication system are error.
• Transmission
• Reception (ECM)
• Reception (Unified meter and A/C amp.)
• Reception (TCM)
• Reception (Steering angle sensor)
• Reception (IPDM E/R)

U1010 CONTROL UNIT (CAN)

EXL-59

< COMPONENT DIAGNOSIS >

[XENON TYPE]

C

D

E

F

G

H

I

J

K

M

A

B

EXL

N

O

P

U1010 CONTROL UNIT (CAN)

DTC Logic

INFOID:0000000001728893

DTC DETECTION LOGIC

[U1010] Control unit (CAN)

Diagnosis Procedure

INFOID:0000000001728894

1.

REPLACE AFS CONTROL UNIT

When DTC [U1010] is detected, replace AFS control unit.

>> Replace AFS control unit.

DTC detection condition

DTC erase condition

Possible cause

AFS control unit detected internal CAN communication circuit malfunction.

Ignition switch OFF

AFS control unit