Infiniti QX56 (JA60). Manual - part 289

P1831 VDC OPERATION SIGNAL (ABS)

DLN-79

< COMPONENT DIAGNOSIS >

[ATX14B]

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P1831 VDC OPERATION SIGNAL (ABS)

Description

INFOID:0000000005148847

Malfunction is detected in the VDC operation signal that is output from ABS actuator and electric unit (control

unit) through CAN communication.

DTC Logic

INFOID:0000000005148848

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1831 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-79, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148849

1.

CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT

Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to 

BRC-23, "CONSULT-III

Function (ABS)"

.

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 2.

2.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-81, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 3.

NO

>> Check transfer control unit pin terminals for damage or loose connection with harness connector.

If any items are damaged, repair or replace damaged parts.

3.

CHECK DTC

Perform the self-diagnosis, after driving a vehicle for a while.
Are the inspection results normal?

YES

>> Inspection End.

NO

>> Perform self-diagnosis with ABS actuator electric unit (control unit) again.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1831]

VDC OP SIG

Malfunction is detected in VDC opera-
tion signal that is output from ABS actu-
ator and electric unit (control unit) 
through CAN communication.

Refer to 

DLN-79

.

DLN-80

< COMPONENT DIAGNOSIS >

[ATX14B]

P1832 TCS OPERATION SIGNAL (ABS)

P1832 TCS OPERATION SIGNAL (ABS)

Description

INFOID:0000000005148850

Malfunction is detected in TCS operation signal that is output from ABS actuator and electric unit (control unit)

through CAN communication.

DTC Logic

INFOID:0000000005148851

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1832 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-80, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148852

1.

CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT

Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to 

BRC-23, "CONSULT-III

Function (ABS)"

.

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 2.

2.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-81, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 3.

NO

>> Check transfer control unit pin terminals for damage or loose connection with harness connector.

If any items are damaged, repair or replace damaged parts.

3.

CHECK DTC

Perform the self-diagnosis, after driving a vehicle for a while.
Are the inspection results normal?

YES

>> Inspection End.

NO

>> Perform self-diagnosis with ABS actuator electric unit (control unit) again.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1832]

TCS OP SIG

Malfunction is detected in TCS operation 
signal that is output from ABS actuator 
and electric unit (control unit) through 
CAN communication.

Refer to 

DLN-80

.

TRANSFER CONTROL UNIT

DLN-81

< ECU DIAGNOSIS >

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ECU DIAGNOSIS

TRANSFER CONTROL UNIT

Reference Value

INFOID:0000000005148853

VALUE ON THE DIAGNOSIS TOOL

CONSULT-III data monitor item

Monitored item [Unit]

Content

Condition

Display value

VHCL/S SEN·FR [km/h] 
or [mph]

Wheel speed (Front 
wheel)

Vehicle stopped

0 km/h (0 mph)

Vehicle running

CAUTION:

Check air pressure of tire under standard condition.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 
±10%)

VHCL/S SEN·RR [km/h] 
or [mph]

Wheel speed (Rear 
wheel)

Vehicle stopped

0 km/h (0 mph)

Vehicle running

CAUTION:

Check air pressure of tire under standard condition.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 
±10%)

ENGINE SPEED [rpm]

Engine speed

Engine stopped
(Engine speed: Less than 400 rpm)

0 rpm

Engine running
(Engine speed: 400 rpm or more)

Approximately 
equal to the indica-
tion on tachometer

THRTL POS SEN [V]

Accelerator pedal posi-
tion (APP) sensor signal 
voltage

Accelerator pedal: Released

Approx. 0.5V

Accelerator pedal: Fully depressed

Approx. 4.0V

FLUID TEMP SE [V]

Transfer fluid tempera-
ture signal voltage

Transfer fluid temperature approx. 20 - 80

°C (68 - 176°F) Approx. 1.1 - 0.3V

BATTERY VOLT [V]

Power supply voltage for 
transfer control unit

Ignition switch: ON

Battery voltage

2WD SWITCH [ON/OFF]

Input condition from 4WD 
shift switch

4WD shift switch: 2WD

ON

4WD shift switch: AUTO, 4H or 4LO

OFF

AUTO SWITCH [ON/
OFF]

Input condition from 4WD 
shift switch

4WD shift switch: AUTO

ON

4WD shift switch: 2WD, 4H or 4LO

OFF

LOCK SWITCH [ON/
OFF]

Input condition from 4WD 
shift switch

4WD shift switch: 4H

ON

4WD shift switch: 2WD, AUTO or 4LO

OFF

4L SWITCH [ON/OFF]

Input condition from 4WD 
shift switch

4WD shift switch: 4LO

ON

4WD shift switch: 2WD, AUTO or 4H

OFF

N POSI SW TF [ON/
OFF]

Condition of neutral-4LO 
switch

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 2WD, 
AUTO or 4H

OFF

4WD shift switch: 4H to 
4LO (While actuator mo-
tor is operating.)

OFF

→ON

4WD shift switch: 4LO to 
4H (While actuator motor 
is operating.)

ON

→OFF

4WD shift switch: 4LO

ON

DLN-82

< ECU DIAGNOSIS >

[ATX14B]

TRANSFER CONTROL UNIT

ATP SWITCH [ON/OFF]

Condition of ATP switch

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch
: 4H to 4LO or 4LO to 4H
(While actuator motor is 
operating.)

 ON

Except the above

OFF

WAIT DETCT SW [ON/
OFF]

Condition of wait detec-
tion switch

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 2WD, 
AUTO or 4H

OFF

4WD shift switch: 4H to 
4LO (While actuator mo-
tor is operating.)

OFF

→ON

4WD shift switch: 4LO to 
4H (While actuator motor 
is operating.)

ON

→OFF

4WD shift switch: 4LO

ON

LINE PRES SW [ON/
OFF]

Condition of line pres-
sure switch

• A/T selector lever D position
• 4WD shift switch: AUTO

ON

• Except the above
• The vehicle has been left at 

room temperature for 5 
minutes and more with ig-
nition switch in OFF posi-
tion.

• Ignition switch: ON
• A/T selector lever: P or 

N position

• 4WD shift switch: other 

than AUTO

OFF

CL PRES SW [ON / OFF]

Condition of clutch pres-
sure switch

• Vehicle stopped
• Engine running
• A/T selector lever D position
• 4WD shift switch: AUTO or 4H (Wait function is not op-

erating.)

ON

• Vehicle stopped
• Engine running
• 4WD shift switch: 2WD (Wait function is not operating.)

OFF

N POSI SW AT [ON/
OFF]

Input condition from 
transmission range 
switch

• Vehicle stopped
• Engine running
• Brake pedal depressed

A/T selector lever posi-
tion: N

ON

Except the above

OFF

R POSI SW AT [ON/
OFF]

Input condition from 
transmission range 
switch

• Vehicle stopped
• Engine running
• Brake pedal depressed

A/T selector lever posi-
tion: R

ON

Except the above

OFF

P POSI SW AT [ON/OFF]

Input condition from 
transmission range 
switch

• Vehicle stopped
• Engine running
• Brake pedal depressed

A/T selector lever posi-
tion: P

ON

Except the above

OFF

ABS OPER SW [ON/
OFF]

Condition of ABS operat-
ing

ABS is operating.

ON

ABS is not operating.

OFF

VDC OPER SW [ON/
OFF]

Condition of VDC operat-
ing

VDC is operating.

ON

VDC is not operating.

OFF

TCS OPER SW [ON/
OFF]

Condition of TCS operat-
ing

TCS is operating.

ON

TCS is not operating.

OFF

THROTTLE POSI [0.0/8]

Condition of throttle 
opening

When depressing accelerator pedal
(Value rises gradually in response to throttle position.)

0.0/8 - 8.0/8

4WD MODE [AUTO/
LOCK/2WD/4L]

Control status of 4WD
(Output condition of 4WD 
shift indicator lamp and 
4LO indicator lamp)

• Vehicle stopped
• Engine running
• A/T selector lever N posi-

tion

• Brake pedal depressed

4WD shift switch: 2WD

2WD

4WD shift switch: AUTO

AUTO

4WD shift switch: 4H

LOCK

4WD shift switch: 4LO

4L

Monitored item [Unit]

Content

Condition

Display value