Hyundai Tucson: 4WD Control System / 4WD ECU Repair procedures

Replacement
1.
Prior to replacing the 4WD ECU, check the 4WD ECU's clutch learing with the GDS tool.
(Refer to 4WD Control System - "Adjustment")
2.
Disconnect the battery negative cable from the battery
3.
Disconnect the 4WD ECU connector (A).

4.
Loosen the nust (A) and then remove the 4WD ECU.

Tightening torque:
9.8 ~11.8N.m (1.0~1.2kgf.m, 7.2~8.7lb-ft)

Installation
1.
Install in the reverse order of removal.
2.
Prior to installing a new ECU, upload the original ECU’s clutch learing to the replacement ECU using the GDS tool.
(Refer to 4WD Control System - "Adjustment")
4WD ECU Schematic Diagrams
Circuit Diagram 4WD ECU Connector PinFunction1CAN communication line (Low)2CAN communication line (High)3-4Pressure sensor signal(+)5-6Lock mode switch7Oil pressure motor B8Oil pressure motor ...

Coupling Assembly
...

Other information:

Hyundai Tucson (LM) 2010-2015 Service Manual: Specifications
Specifications ItemsSpecificationsRated voltageDC 12VOperating temperature range -22 ~ +176°F (-30°C ~ +80°C)Rated loadDimmer & passingswitchHigh : 0.2A (Relay load)Low : 0.2A (Relay load)Passing : 0.2A (Relay load)Lighting switchLighting : 0.2A (Relay load)Turn signal switch6.6 ± 0.5A ...

Hyundai Tucson (LM) 2010-2015 Owners Manual: Reporting safety defects
If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTSA) in addition to notifying HYUNDAI MOTOR AMERICA. If NHTSA receives similar complaints, it may open an ...

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