Infiniti QX56 (JA60). Manual — part 274

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

DLN-19

< FUNCTION DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

12. Move A/T selector lever to N position.
13. Turn 4WD shift switch to AUTO position.
14. Move A/T selector lever to P position.
15. Read the flickering of 4WD warning lamp.

Self-diagnosis example

ERASE SELF-DIAGNOSIS

• In order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is

stored into the control unit as necessary during use by the user. This memory is not erased no matter how

many times the ignition switch is turned ON and OFF.

• However, this information is erased by turning ignition switch OFF after performing self-diagnostics or by

erasing the memory using the CONSULT-III.

DATA MONITOR MODE

Operation Procedure

1. Connect CONSULT-III.
2. Touch DATA MONITOR.
3. Select from SELECT MONITOR ITEM, screen of data monitor mode is displayed.

NOTE:

When malfunction is detected, CONSULT-III performs REAL-TIME DIAGNOSIS.

Also, any malfunction detected while in this mode will be displayed at real time.

Display Item List

×: Standard –: Not applicable

PDIA0227E

Monitored item (Unit)

Monitor item selection

Remarks

ECU INPUT

SIGNALS

MAIN

SIGNALS

SELEC-

TION FROM

MENU

VHCL/S SEN·FR [km/h] or [mph]

×

–

×

Wheel speed calculated by ABS actuator and
electric unit (control unit).
Signal input with CAN communication line.

VHCL/S SEN·RR [km/h] or [mph]

×

–

×

Wheel speed calculated by TCM.
Signal input with CAN communication line.

ENGINE SPEED [rpm]

×

–

×

Engine speed calculated by ECM.
Signal input with CAN communication line.

THRTL POS SEN [V]

×

–

×

Accelerator pedal position (APP) sensor sig-
nal voltage is displayed.
Signal input with CAN communication line.

FLUID TEMP SE [V]

×

–

×

Transfer fluid temperature sensor signal volt-
age is displayed.

BATTERY VOLT [V]

×

–

×

Power supply voltage for transfer control unit.

2WD SWITCH [On/Off]

×

–

×

4WD shift switch status is displayed.

AUTO SWITCH [On/Off]

×

–

×

4WD shift switch status is displayed.

LOCK SWITCH [On/Off]

×

–

×

4WD shift switch status is displayed.
(LOCK means 4H of 4WD shift switch.)

DLN-20

< FUNCTION DIAGNOSIS >

[ATX14B]

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

4L SW [On/Off]

×

–

×

4WD shift switch status is displayed.
(4L means 4LO of 4WD shift switch.)

N POSI SW TF [On/Off]

×

–

×

Neutral-4LO switch signal status is displayed.

ATP SWITCH [On/Off]

×

–

×

ATP switch signal status is displayed.

WAIT DETCT SW [On/Off]

×

–

×

Wait detection switch status is displayed.

LINE PRES SW [On/Off]

×

–

×

Line pressure switch status is displayed.

CL PRES SW [On/Off]

×

–

×

Clutch pressure switch status is displayed.

N POSI SW AT [On/Off]

×

–

×

N position signal of transmission range switch
status is displayed.
Signal input with CAN communication line.

R POSI SW AT [On/Off]

×

–

×

R position signal of transmission range switch
status is displayed.
Signal input with CAN communication line.

P POSI SW AT [On/Off]

×

–

×

P position signal of transmission range switch
status is displayed.
Signal input with CAN communication line.

ABS OPER SW [On/Off]

×

–

×

ABS operation signal status is displayed.
Signal input with CAN communication line.

VDC OPER SW [On/Off]

×

–

×

VDC operation signal status is displayed.
Signal input with CAN communication line.

TCS OPER SW [On/Off]

×

–

×

TCS operation signal status is displayed.
Signal input with CAN communication line.

THROTTLE POSI [0.0/8]

–

×

×

Thottle position status is displayed.
Signal input with CAN communication line.

4WD MODE [AUTO/LOCK/2WD/4L]

–

×

×

Control status of 4WD recognized by transfer
control unit. (AUTO, 4H, 2WD or 4LO)

VHCL/S COMP [km/h] or [mph]

–

×

×

Vehicle speed recognized by transfer control
unit.

COMP CL TORQ [kgm]

–

×

×

Calculated torque recognized by transfer con-
trol unit.

DUTY SOLENOID [%]

–

×

×

Control value of clutch pressure solenoid.

2-4WD SOL [On/Off]

–

×

×

Output condition to 2-4WD solenoid.

2-4WD SOL MON [On/Off]

–

–

×

Check signal for transfer control unit signal
output.

MOTOR RELAY [On/Off]

–

×

×

Transfer motor relay signal status is dis-
played.

MOTOR RELAY MON [On/Off]

–

–

×

Check signal for transfer control unit signal
output.

4WD FAIL LAMP [On/Off]

–

×

×

Control status of 4WD warning lamp is dis-
played.

2WD IND [On/Off]

–

–

×

Control status of 4WD shift indicator lamp
(2WD indicator lamp) is displayed.

AUTO IND [On/Off]

–

–

×

Control status of 4WD shift indicator lamp
(2WD and AUTO indicator lamp) is displayed.

LOCK IND [On/Off]

–

–

×

Control status of 4WD shift indicator lamp
(2WD, AUTO and Lock indicator) is displayed.

4L IND [On/Off]

–

–

×

Control status of 4LO indicator lamp is dis-
played.

Monitored item (Unit)

Monitor item selection

Remarks

ECU INPUT

SIGNALS

MAIN

SIGNALS

SELEC-

TION FROM

MENU

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

DLN-21

< FUNCTION DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

WORK SUPPORT

When there is no malfunction with transfer and 4WD system, the following symptoms in AUTO mode may be

claimed by a customer: vibration when accelerating on a low

µ road (snow-covered or icy road) or a slight

shock is felt at a few hertz as if it were being pushed lightly from behind.

It is possible to deal with these symptoms by changing the CLUTCH FORCE RELEASE LIMIT VALUE. How-

ever, be careful when changing the value because it may adversely affect driving performance.

Operation Procedure

1. Connect CONSULT-III.
2. Touch WORK SUPPORT.
3. Select from CLUTCH/F RLS LIM ADJ, screen of data monitor mode is displayed.

Clutch Force Release Limit Adjustment

1. Initial CLUTCH FORCE RELEASE LIMIT value 0.3 kgm appears under CONDITION SETTING on CON-

SULT-III display.

2. Touch 1.2 on the display.

3. Display changes to NOW ADJUSTING in a short time.

4. When clutch force release limit value is set to 1.2 kgm, current value 0.3 kgm shown on display will be

replaced by 1.2 kgm and ADJUSTMENT COMPLETE will appear at the same time. Clutch force release

limit value setting is now complete.

ATP IND [On/Off]

–

–

×

Control status of ATP warning lamp is dis-
played.

SHIFT POS SW1 [On/Off]

×

–

×

Actuator position switch 1 (Low) signal status
is displayed.

SHIFT POS SW2 [On/Off]

×

–

×

Actuator position switch 2 (high) signal status
is displayed.

SHIFT ACT1 [On/Off]

–

×

×

Output condition to actuator motor (clockwise)

SHIFT AC MON1 [On/Off]

×

–

×

Check signal for transfer control unit signal
output

SHIFT ACT2 [On/Off]

–

×

×

Output condition to actuator motor (counter-
clockwise)

SHIFT AC MON2 [On/Off]

×

–

×

Check signal for transfer control unit signal
output

T/F F SPEED [km/h] or [mph]

×

–

×

Displayed, but do not use.

A/T R SPEED [km/h] or [mph]

×

–

×

Output shaft revolution signal (output speed
sensor) calculated by TCM.
Signal input with CAN communication line.

AT GEAR POSI [1/2/3/4/5]

×

–

×

A/T actual gear position is displayed.

Monitored item (Unit)

Monitor item selection

Remarks

ECU INPUT

SIGNALS

MAIN

SIGNALS

SELEC-

TION FROM

MENU

1.2 kg-m : Tight corner braking symptom is alleviated.

However, vibration may occur when acceler-
ating on a low

µ road (icy road, etc.).

0.3 kg-m : Initial set value.
0.2 kg-m : Do not set to this value because the tight

corner braking symptom will get worse.

DLN-22

< COMPONENT DIAGNOSIS >

[ATX14B]

P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

COMPONENT DIAGNOSIS

P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

Description

INFOID:0000000005148775

Power supply to transfer control unit is abnormally low while driving.

DTC Logic

INFOID:0000000005148776

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1811 detected?

YES

>> Perform diagnosis procedure. Refer to

DLN-22, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148777

Regarding Wiring Diagram information, refer to

DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"

.

1.

CHECK POWER SUPPLY

1. Turn ignition switch OFF. (Stay for at least 5 seconds.)

2. Connect transfer control unit harness connector.

3. Check voltage between transfer control unit harness connector

terminals and ground.

4. Turn ignition switch ON. (Do not start engine.)

5. Check voltage between transfer control unit harness connector

terminals and ground.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1811]

BATTERY VOLTAGE

Power supply voltage for transfer control
unit is abnormally low while driving.

Refer to

DLN-22

.

Connector

Terminal

Voltage (Approx.)

E142

16 - Ground

0V

22 - Ground

E143

29 - Ground

30 - Ground

Battery voltage

47 - Ground

WDIA0165E

Connector

Terminal

Voltage (Approx.)

E142

16 - Ground

Battery voltage

22 - Ground

E143

29 - Ground

30 - Ground

0V

47 - Ground

Battery voltage

WDIA0166E