Hyundai Santa Fe (TM): 4WD Control System - 4 Wheel Drive (4WD) SystemHyundai Santa Fe (TM): 4WD Control System

Repair procedures

Adjustment
Description
The friction material inside the coupling will degrade over time. Therefore, corresponding compensation values must be referenced and entered after replacing the controller or the coupling.
Compensation Requirement and Procedure
1.
Simultaneous replacement of 4WD ECU (Controller) and coupling
Does not require compensation.
2.
Replacement of coupling only
Reset the 4WD ECU's (Controller) clutch learning.

3.
Replacement of 4WD ECU (Controller) only
Before replacement: Check the ECU's clutch learning.

After replacement: Enter the original ECU's clutch learning into the replacement ECU.

Perform the following procedure in case of the appearance of failure code (P182900, P183600).

Description and operation

Description
The AWD ECU distributes the driving force to the front/rear wheel through controlling the multi plate clutch on the AWD transfer case by analyzing the input information, i.e. the wheel speed, accelerator and steering angle depending on the road condition and driving state. The AWD vehicle has different power transmitting conditions depending on the driving/road conditions. The vehicle speed is transmitted through CAN communication from ABS/ESP ECU.
The information from the CAN communication includes the APS which indicates the driver’s intention of acceleration, engine torque, ABS/ESP operation signal and gear position. The AWD ECU controls the BLDC motor, warning lamp and indicating lamp and communicates with the tester equipment. When a vehicle runs at normal speed higher than 60KPH on regular roads, it is controlled under the 2WD conditions. The ECU decides the driving force on the front and rear wheel by receiving the signals from all sensors depending on the driving conditions, i.e. abrupt starting, turning and driving on the low friction road, and the optimized torque which is proper to the driving condition is transmitted to the front wheel through calculating and controlling the transmitted torque data.

Components and components location

Components Location

1. 4WD ECU
2. Luggage side trim [Left side]

Flow diagram

Power Flow Diagram

4WD ECU Input&Output Diagram

Schematic diagrams

Circuit Diagram
4WD ECU Connector

4WD ECU Pin Function
Pin
Function
1
Motor B
2
Motor A
3
-
4
-
5
Pressure sensor (power)
6
-
7
IG1
8
Motor shield wire ground
9
Battery ground
10
Battery power
11
-
12
-
13
-
14
Pressure sensor signal
15
Pressure sensor ground
16
-
17
CAN 1 HIGH
18
CAN 1 LOW
19
CAN 2 HIGH

Repair procedures

Removal
1.
Prior to replacing the 4WD ECU, check the 4WD ECU's clutch learing with the diagnostic tool.
(Refer to 4WD Control System - "Repair Procedures")
2.
Turn OFF ignition switch and the disconnect the negative (-) battery cable.
3.
Remove the luggage side trim. [Left side]
(Refer to Body - "Luggage Side Trim")
4.
Disconnect the 4WD ECU connector (A).
5.
Loosen the nuts and then removing the 4WD ECU (B).
Tightening torque:
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

Installation
1.
To install, reverse the removal procedures.
2.
Prior to installing a new ECU, upload the original ECU’s clutch learing to the replacement ECU using the diagnostic tool.
(Refer to 4WD Control System - "Repair Procedures")
Coupling Assembly
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