ELECTRONIC 4WD CONTROL SYSTEM ON-BOARD DIAGNOSIS

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Reading DTCs Procedure

1. Connect the M-MDS (IDS) to the DLC-2.

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2. After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1) Select “Self Test”.

(2) Select “Modules”.

(3) Select “4X4”.

3. Verify the DTC according to the directions on the screen.

• If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection.

4. After completion of repairs, clear all DTCs stored in the AWD CM. (See Clearing DTCs Procedures.)

Clearing DTCs Procedures

1. Connect the M-MDS (IDS) to the DLC-2.

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2. After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1) Select “Self Test”.

(2) Select “Modules”.

(3) Select “4X4”.

3. Verify the DTC according to the directions on the screen.

4. Press the clear button on the DTC screen to clear the DTC.

5. Turn the ignition switch to the OFF position.

6. Turn the ignition switch to the ON position and wait for 5 s or more.

7. Perform DTC inspection. (See Reading DTCs Procedure.)

8. Verify that no DTCs are displayed.

DTC Table

DTC	Diagnosis system component	Page
P1887	4WD solenoid circuit	(See DTC P1887.)
P1888	Differential oil temperature sensor circuit	(See DTC P1888.)
U0073	CAN system communication error	(See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].) (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)
U0100	Communication error to PCM	(See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].) (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)
U0101	Communication error to TCM	(See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].) (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)
U0121	Communication error to DSC/RSC HU/CM	(See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].) (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)
U0155	Communication error to instrument cluster	(See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].) (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)

PID/DATA Monitor Table

PID name (definition)

Unit/Condition

Operation condition (reference)

Action

AAT

°C/°F

•  Ambient air temperature display

—

APP

%

•  Accelerator pedal position display

Inspect the accelerator pedal position sensor.

(See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [MZI-3.7].)

BOO

OFF/ON

•  Brake pedal released: Off

•  Brake pedal depressed: On

Inspect the brake switch.

(See BRAKE SWITCH INSPECTION.)

COUP_SOL

%

•  4WD solenoid operation condition display

Inspect the 4WD solenoid.

(See 4WD SOLENOID INSPECTION.)

OIL_TEMP

°C/°F

•  Rear differential oil temperature display

Inspect the differential oil temperature sensor.

(See DIFFERENTIAL OIL TEMPERATURE SENSOR INSPECTION.)

OIL_TEMP

V

•  Rear differential oil temperature sensor output voltage display

Inspect the differential oil temperature sensor.

(See DIFFERENTIAL OIL TEMPERATURE SENSOR INSPECTION.)

VPWR

V

•  Switch the ignition to ON: Approx. 12.2 V

•  Idling: Approx. 14.1 V

Inspect the 4WD control module.

(See 4WD CONTROL MODULE INSPECTION.)

WSPD_LF

(Left front ABS wheel-speed sensor input)

KPH, MPH

•  Vehicle stopped: 0 KPH, 0 MPH

•  Vehicle running: vehicle speed

Inspect the ABS wheel-speed sensor.

(See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.)

WSPD_LR

(Left rear ABS wheel-speed sensor input)

KPH, MPH

•  Vehicle stopped: 0 KPH, 0 MPH

•  Vehicle running: vehicle speed

Inspect the ABS wheel-speed sensor.

(See REAR ABS WHEEL-SPEED SENSOR INSPECTION [4WD].)

WSPD_RF

(Right front ABS wheel-speed sensor input)

KPH, MPH

•  Vehicle stopped: 0 KPH, 0 MPH

•  Vehicle running: vehicle speed

Inspect the ABS wheel-speed sensor.

(See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.)

WSPD_RR

(Right rear ABS wheel-speed sensor input)

KPH, MPH

•  Vehicle stopped: 0 KPH, 0 MPH

•  Vehicle running: vehicle speed

Inspect the ABS wheel-speed sensor.

(See REAR ABS WHEEL-SPEED SENSOR INSPECTION [4WD].)

4WD_LAMP

OFF/BLINK/ON

•  Control inhibited: ON

•  Control paused: BLINK

•  Normal: OFF

—

PID name (definition)	Unit/Condition	Operation condition (reference)	Action
AAT	°C/°F	• Ambient air temperature display	—
APP	%	• Accelerator pedal position display	Inspect the accelerator pedal position sensor. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [MZI-3.7].)
BOO	OFF/ON	• Brake pedal released: Off • Brake pedal depressed: On	Inspect the brake switch. (See BRAKE SWITCH INSPECTION.)
COUP_SOL	%	• 4WD solenoid operation condition display	Inspect the 4WD solenoid. (See 4WD SOLENOID INSPECTION.)
OIL_TEMP	°C/°F	• Rear differential oil temperature display	Inspect the differential oil temperature sensor. (See DIFFERENTIAL OIL TEMPERATURE SENSOR INSPECTION.)
OIL_TEMP	V	• Rear differential oil temperature sensor output voltage display	Inspect the differential oil temperature sensor. (See DIFFERENTIAL OIL TEMPERATURE SENSOR INSPECTION.)
VPWR	V	• Switch the ignition to ON: Approx. 12.2 V • Idling: Approx. 14.1 V	Inspect the 4WD control module. (See 4WD CONTROL MODULE INSPECTION.)
WSPD_LF (Left front ABS wheel-speed sensor input)	KPH, MPH	• Vehicle stopped: 0 KPH, 0 MPH • Vehicle running: vehicle speed	Inspect the ABS wheel-speed sensor. (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.)
WSPD_LR (Left rear ABS wheel-speed sensor input)	KPH, MPH	• Vehicle stopped: 0 KPH, 0 MPH • Vehicle running: vehicle speed	Inspect the ABS wheel-speed sensor. (See REAR ABS WHEEL-SPEED SENSOR INSPECTION [4WD].)
WSPD_RF (Right front ABS wheel-speed sensor input)	KPH, MPH	• Vehicle stopped: 0 KPH, 0 MPH • Vehicle running: vehicle speed	Inspect the ABS wheel-speed sensor. (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.)
WSPD_RR (Right rear ABS wheel-speed sensor input)	KPH, MPH	• Vehicle stopped: 0 KPH, 0 MPH • Vehicle running: vehicle speed	Inspect the ABS wheel-speed sensor. (See REAR ABS WHEEL-SPEED SENSOR INSPECTION [4WD].)
4WD_LAMP	OFF/BLINK/ON	• Control inhibited: ON • Control paused: BLINK • Normal: OFF	—

Active Command Modes Table

Command name

Output part

Operation

Operating condition

4WD_MODE

4WD solenoid

OFF/ON

Ignition switch at ON