Infiniti G37 Coupe. Manual - part 1270

 

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Infiniti G37 Coupe. Manual - part 1270

 

 

U1000 CAN COMM CIRCUIT

STC-131

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

C

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STC

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000001666459

• CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle

multiplex communication line with high data communication speed and excellent error detection ability. Many
electronic control units are equipped onto a vehicle, 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 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.

DTC Logic

INFOID:0000000001666460

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform 4WAS main control unit self-diagnosis.

Is DTC “U1000” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-131, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666461

1.

PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)

Perform 4WAS main control unit self-diagnosis.
Is DTC “U1000” detected?

YES

>> Perform CAN diagnosis.

NO

>> INSPECTION END.

Special Repair Requirement

INFOID:0000000001666462

BEFORE REPLACING 4WAS MAIN CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase the memory (history) of self-diagnosis results when replacing 4WAS main control unit

after diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

U1000

CAN COMM

When 4WAS main control unit is not transmitting or re-
ceiving CAN communication signal for 2 seconds or 
more.

CAN communication er-
ror

STC-132

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000001666463

• CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle

multiplex communication line with high data communication speed and excellent error detection ability. Many
electronic control units are equipped onto a vehicle, 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 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.

DTC Logic

INFOID:0000000001666464

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RECHECK DTC

With CONSULT-III

1.

Turn the ignition switch from OFF to ON.

2.

Perform 4WAS main control unit self-diagnosis.

Is DTC “U1010” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-132, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001666465

1.

4WAS MAIN CONTROL UNIT

Check that there is no malfunction in 4WAS main control unit harness connector or disconnection.

Is the inspection result normal? 

YES

>> Replace 4WAS main control unit. Refer to 

STC-178, "Exploded View"

.

NO

>> Repair or replace the harnesses and connectors. Refer to 

STC-176, "Precautions for Harness

Repair"

.

Special Repair Requirement

INFOID:0000000001666466

BEFORE REPLACING 4WAS MAIN CONTROL UNIT

• Record the self-diagnosis results (history).

CAUTION:

• Never erase the memory (history) of self-diagnosis results when replacing 4WAS main control unit

after diagnosis.

• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-

ues of “DATA MONITOR”.

DTC

Items

(CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

U1010

CONTROL UNIT (CAN)

When detecting error during the initial diagnosis of CAN 
controller of 4WAS main control unit.

CAN communication line/ 
4WAS main control unit/
ECM/ABS actuator and 
electric unit (control unit) 
error

POWER SUPPLY AND GROUND CIRCUIT

STC-133

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

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POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000001666467

• 4WAS system power supply

Diagnosis Procedure (4WAS Front Control Unit)

INFOID:0000000001666468

1.

CHECK 4WAS FRONT CONTROL UNIT POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS front control unit harness connector.

3.

Check the voltage between 4WAS front control unit harness connectors and the ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between 4WAS front control unit harness connectors and the ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>>

Check the following items. Repair or replace the malfunctioning parts.

• 40A fusible link (#I) open
- Short among 40A fusible link (#I) connector, 4WAS front control unit harness connector No. 11

terminal and the ground

• Open between the battery and 4WAS front control unit harness connector No. 11 terminal
• 10A fuse (#3) open
- Short among 10A fuse (#3) connector, 4WAS front control unit harness connector No. 15 termi-

nal and the ground

- Short among 10A fuse (#3) connector, unified meter and A/C amp No. 53 terminal and the

ground

• Open between the ignition switch and 4WAS front control unit harness connector No. 15 termi-

nal

• Battery or ignition switch

2.

CHECK 4WAS FRONT CONTROL UNIT GROUND

Check the continuity between 4WAS front control unit harness connector and the ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace the harnesses and connectors.

4WAS front control unit

Voltage (Approx.)

Connector

Terminal

M41

11 – Ground

Battery voltage

M42

15 – Ground

0 V

4WAS front control unit

Voltage (Approx.)

Connector

Terminal

M41

11 – Ground

Battery voltage

M42

15 – Ground

4WAS front control unit

Continuity

Connector

Terminal

M41

12 – Ground

Existed

M42

18 – Ground

34 – Ground

STC-134

< COMPONENT DIAGNOSIS >

[WITH 4WAS]

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure (4WAS Main Control Unit)

INFOID:0000000001666469

1.

CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY

1.

Turn the ignition switch OFF.

2.

Disconnect 4WAS main control unit harness connector.

3.

Check the voltage between 4WAS main control unit harness connectors and the ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between 4WAS main control unit harness connectors and the ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>>

Check the following items. Repair or replace the malfunctioning parts.

• 10A fuse (#45) open
- Short among 10A fuse (#45) connector, 4WAS main control unit harness connector No. 27 ter-

minal and the ground

• Open between the ignition switch and 4WAS main control unit harness connector No. 27 termi-

nal

• Ignition switch

2.

CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (1)

1.

Turn the ignition switch OFF.

2.

Remove 4WAS rear motor relay.

3.

Check the continuity between 4WAS rear motor relay harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the harnesses and connectors.

3.

CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (2)

Check the voltage between 4WAS rear motor relay harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>>

Check the following items. Repair or replace the malfunctioning parts.

• 20A fuse (#37) open
- Short among 20A fuse (#37) connector, 4WAS rear motor relay harness connector No. 3 termi-

nal and the ground

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

27 – Ground

0 V

4WAS main control unit

Voltage (Approx.)

Connector

Terminal

B54

27 – Ground

Battery voltage

4WAS rear motor relay

Continuity

Connector

Terminal

B53

1 – Ground

Existed

2 – Ground

Not existed

4WAS rear motor relay

Voltage (Approx.)

Connector

Terminal

B53

3 – Ground

Battery voltage

 

 

 

 

 

 

 

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