SYSTEM DESCRIPTION
1. FUNCTION OF MAIN COMPONENTS
Component |
Function |
|
---|---|---|
Accessory Meter Assembly |
AWD Warning Light |
|
Speed Sensors (4) |
Detects the wheel speed of each wheel. |
|
Crankshaft Position Sensor |
Detects the engine speed and outputs it to the ECM. |
|
Throttle Position Sensor |
Detects the throttle valve position and outputs it to the ECM. |
|
Park/Neutral Position Switch Assembly |
Detects the shift position of the transaxle and outputs it to the ECM. |
|
Stop Light Switch Assembly |
Detects when the brake pedal is depressed. |
|
Parking Brake Switch Assembly |
Detects when the parking brake is applied. |
|
Deceleration Sensor |
Detects the vehicle's longitudinal acceleration and deceleration |
|
Transfer |
Drive force input into the differential is redirected 90 degrees and output to the propeller shaft by the transfer. |
|
Rear Differential |
Electromagnetic Control Coupling - Electromagnetic Solenoid |
Distributes drive torque in accordance with the amperage applied by the AWD control ECU. |
AWD Control ECU |
|
|
ECM |
Outputs signals such as the shift position signal, throttle position signal, and crankshaft position signal to the AWD control ECU. |
|
Skid Control ECU |
Outputs signals such as the vehicle speed signal and deceleration signal to the AWD control ECU. |
|
Main Body ECU (Instrument Panel Junction Block) |
Outputs signals such as the parking brake signal to the AWD control ECU. |
2. OPERATION
(a) 2WD Mode
(1) The drive force is transmitted from the propeller shaft to the front housing.
(2) The AWD control ECU judges whether it is necessary to send drive torque to the rear wheels based on input from various sensors. When it is not necessary to send drive torque to the rear wheels, the electromagnetic solenoid is not operated.
(3) The drive force of the front housing is not transmitted to the shaft because the control clutch is not engaged.
(4) Accordingly, drive force from the propeller shaft is not transmitted to the rear wheels.
(b) AWD Mode
(1) The drive force is transmitted from the propeller shaft to the front housing.
(2) The AWD control ECU judges whether it is necessary to send drive torque to the rear wheels based on input from various sensors. When it is necessary to send drive torque to the rear wheels, the electromagnetic solenoid is operated.
(3) It attracts the armature to the control clutch side. This causes the control clutch to engage and the cam to rotate.
(4) The rotational movement of the cam causes the piston to push on the main clutch, causing the main clutch to engage.
(5) The amount of drive force that is transmitted to the rear wheels is controlled steplessly by controlling the amperage that is applied to the electromagnetic solenoid.
(6) Accordingly, drive force from the propeller shaft is transmitted to the rear wheels.
Disassembly
DISASSEMBLY
PROCEDURE
1. REMOVE BRAKE PEDAL RETURN SPRING
(a) Remove the brake pedal return spring from the brake pedal support
assembly.
2. REMOVE BRAKE PEDAL PAD
(a) Remove the brake pedal pa ...
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuators and other items to be read without removing any parts. This non-intrusive
inspection can be very useful bec ...
Horn Circuit
DESCRIPTION
When the theft deterrent system is switched from the armed state to the alarm
sounding state, the main body ECU (driver side junction block assembly) transmits
a signal to cause the horn to sound at intervals of 0.4 seconds.
WIRING DIAGRAM
...