AWD ECU

Components and Component Location

Component Location

1. 4WD ECU

2. Luggage compartment trim [left side]

Description and Operation

Description

The AWD ECU distributes driving force to the front and rear wheels by controlling the multi-plate clutch in the transfer case. It analyzes input information, including wheel speed, accelerator pedal position, and steering wheel angle, according to road and driving conditions. The AWD vehicle has various power transmission conditions depending on driving and road conditions. Vehicle speed is received via CAN communication from the ABS/ESP ECU. CAN information includes APS, which indicates the driver's acceleration intent, engine torque, ABS/ESP operation signal, and gear position. The AWD ECU controls the BLDC motor, warning lamp, and indicator lamp, and communicates with the scan tool. When the vehicle operates in normal mode on regular roads above 60 km/h speed, it is controlled in 2WD mode. The ECU determines the driving force for the front and rear wheels by receiving signals from all sensors according to driving conditions, such as rapid start, cornering, and driving on low-friction road surfaces. Optimized torque suitable for the driving conditions is transmitted to the rear wheels through calculation and control of the transmitted torque data.

Flow Diagram

Power flow diagram

AWD ECU input/output diagram

Circuit Diagrams

Wiring Diagram

AWD ECU connector

AWD ECU terminal function

Pin	Function
1	Motor B
2	Motor A
3	-
4	-
5	Pressure sensor power supply
6	-
7	IG1
8	Engine shield wire ground
9	Battery ground
10	Battery power supply
11	-
12	-
13	-
14	Pressure Sensor Signal
15	Pressure sensor ground
16	-
17	CAN HIGH
18	CAN LOW
19	-
20	-

Repair Procedures

Removal

1. 1
   Before replacing the AWD ECU, check the clutch learning value of the AWD ECU using the scan tool. (Refer to All Wheel Drive System - Repair Procedures)
2. 2
   Turn the ignition switch OFF and disconnect the negative (-) battery cable.
3. 3
   Remove the left luggage compartment side trim. (Refer to Body - Interior Trim)
4. 4
   Disconnect the AWD ECU connector (A).

   

5. 5
   Loosen the mounting nuts and remove the AWD ECU (A).

   Tightening torque: 9.8–11.8 N·m

   

Installation

1. 1
   To install, reverse the removal procedure.
2. 2
   Before installing the new ECU, download the clutch learning data of the original ECU into the new ECU using the scan tool. (Refer to All Wheel Drive System - Repair Procedures)