Infiniti G35 (V35) Sedan. Manual - part 653

 

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Infiniti G35 (V35) Sedan. Manual - part 653

 

 

EXL-54

< COMPONENT DIAGNOSIS >

[XENON TYPE]

B2521 ECU CIRCUIT

B2521 ECU CIRCUIT

Description

INFOID:0000000000962451

AFS control unit judges the vehicle condition from each signal. AFS control unit controls AFS function and the
headlamp aiming.

DTC Logic

INFOID:0000000000962452

DTC DETECTION LOGIC

[B2521] ECU circuit

DTC CONFIRMATION PROCEDURE

1.

DTC ERASE

Erase the DTC memory of AFS with CONSULT-III.

>> GO TO 2.

2.

DTC CONFIRMATION PROCEDURE

1.

Turn ignition ON.

2.

Select the self-diagnosis with CONSULT-III.

3.

Check the self-diagnosis result. Refer to 

EXL-173, "DTC Index"

.

Is “B2521” detected?

YES

>> Refer to 

EXL-54, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-39, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000000962453

1.

CHECK EACH SENSOR POWER SUPPLY

1.

Turn the ignition switch ON.

2.

Check the voltage between the AFS control unit harness connector and the ground.

Is the measurement value within the standard value?

YES

>> GO TO 2.

Less than the standard value >>GO TO 3.
Higher than the standard value>>GO TO 4.

Error detection condition

DTC erase condition

Possible cause

• AFS control unit indicates an applicable DTC when de-

tecting any of the following conditions continuously for 2 
seconds or more. 

- The swivel position sensor is shorted to the power supply 

or the ground.

- The swivel position sensor signal is shorted to the 

ground.

- The height sensor power supply is shorted to the power 

supply or the ground.

- The height sensor signal is shorted to the ground.
• AFS control unit RAM/ROM error

Ignition switch OFF

Swivel position sensor
• Swivel position sensor
• Harness and connector
• AFS control unit
Height sensor
• Height sensor
• Harness and connector
• AFS control unit
AFS control unit (RAM/ROM)
• AFS control unit

Terminals

Voltage

(Approx.)

(+)

(

)

AFS control unit

Ground

Connector

Terminal

M16

4

4 - 6 V

6

24

B2521 ECU CIRCUIT

EXL-55

< COMPONENT DIAGNOSIS >

[XENON TYPE]

C

D

E

F

G

H

I

J

K

M

A

B

EXL

N

O

P

2.

CHECK EACH SENSOR SIGNAL

Check the voltage between the AFS control unit harness connector and the ground.

Is the measurement value within the standard value?

YES

>> Replace AFS control unit.

Less than the standard value >>GO TO 5.
Higher than the standard value>>GO TO 6.

3.

CHECK EACH SENSOR POWER SUPPLY SHORT CIRCUIT 

1.

Turn the ignition switch OFF.

2.

Disconnect AFS control unit connector. 

3.

Check continuity between the AFS control unit harness connector and the ground.

Does continuity exist?

YES

>> Repair the harnesses or connectors.

NO

>> Replace AFS control unit.

4.

CHECK EACH SENOSOR POWER SUPPLY CIRCUIT 

1.

Turn the ignition switch OFF.

2.

Disconnect AFS control unit connector. 

3.

Check the voltage between the AFS control unit harness connector and the ground.

Is the measurement value normal?

YES

>> Replace AFS control unit.

NO

>> Repair the harnesses or connectors.

5.

CHECK EACH SENSOR SIGNAL SHORT CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect AFS control unit connector. 

3.

Check continuity between the AFS control unit harness connector and the ground.

Terminals

Voltage

(Approx.)

(+)

(

)

AFS control unit

Ground

Connector

Terminal

M16

9

0.25 - 4.75 V

28

29

Terminals

Continuity

(+)

(

)

AFS control unit

Ground

Connector

Terminal

M16

4

Not existed

6

24

Terminals

Voltage

(Approx.)

(+)

(

)

AFS control unit

Ground

Connector

Terminal

M16

4

0 V

6

24

EXL-56

< COMPONENT DIAGNOSIS >

[XENON TYPE]

B2521 ECU CIRCUIT

Does continuity exist?

YES

>> Repair the harnesses or connectors.

NO

>> Replace AFS control unit.

6.

CHECK EACH SENSOR SIGNAL SHORT CIRCUIT

1.

Turn the ignition switch OFF.

2.

Disconnect AFS control unit connector. 

3.

Turn the ignition switch ON.

4.

Check the voltage between the AFS control unit harness connector and the ground.

Is the measurement value normal?

YES

>> Replace AFS control unit.

NO

>> Repair the harnesses or connectors.

Terminals

Continuity

(+)

(

)

AFS control unit

Ground

Connector

Terminal

M16

9

Not existed

28

29

Terminals

Voltage

(Approx.)

(+)

(

)

AFS control unit

Ground

Connector

Terminal

M16

9

0 V

28

29

C0126 STEERING ANGLE SENSOR SIGNAL

EXL-57

< COMPONENT DIAGNOSIS >

[XENON TYPE]

C

D

E

F

G

H

I

J

K

M

A

B

EXL

N

O

P

C0126 STEERING ANGLE SENSOR SIGNAL

Description

INFOID:0000000000962454

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

DTC Logic

INFOID:0000000000962455

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.

4.

Check the self-diagnosis result. Refer to 

EXL-173, "DTC Index"

.

Is “C0126” detected?

YES

>> Refer to 

EXL-57, "Diagnosis Procedure"

.

NO

>> Refer to 

GI-39, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000000962456

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-77, "Reference Value"

.

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

 

 

 

 

 

 

 

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