Hyundai Elantra: Automatic Transaxle Control System / Transaxle Control Module (TCM) Repair procedures

Hyundai Elantra AD (2016-2020) Service Manual / Automatic Transaxle System / Automatic Transaxle Control System / Transaxle Control Module (TCM) Repair procedures

Inspection

Transaxle Control Module(TCM) Problem Inspection Procedure

TEST TCM GROUND CIRCUIT: Measure resistance between TCM and chassis ground using the backside of TCM harness connector as TCM side check point. If the problem is found, repair it.

Specification: Below 1?

2.	TEST TCM CONNECTOR: Disconnect the TCM connector and visually check the ground terminals on TCM side and harness side for bent pins or poor contact pressure. If the problem is found, repair it.

3.	If problem is not found in Step 1 and 2, the TCM could be faulty. If so, make sure there were no DTC's before swapping the TCM with a new one, and then check the vehicle again. If DTC's were found, examine this first before swapping TCM.

RE-TEST THE ORIGINAL TCM: Install the original TCM (may be broken) into a known-good vehicle and check the vehicle. If the problem occurs again, replace the original TCM with a new one. If problem does not occur, this is intermittent problem (Refer to “Intermittent Problem Inspection Procedure” in Basic Inspection Procedure).

Removal

1.	Oil-pressure characteristics backup (TCM exchange)

2.	Turn ignition switch OFF.

3.	Disconnect the negative (-) battery cable.

4.	Remove the air cleaner assembly and air duct.(Refer to Engine Mechanical System - "Air cleaner")

5.	Disconnect the TCM connector (A).

6.	Remove the fixing clip (A) of wiring.

7.	Remove the TCM (B).

Installation

1.	To install, reverse the removal procedure.

2.	Oil-pressure characteristics input (TCM exchange)

3.	Perform the procedures related in the ECM after replacing the TCM. (Refer to Engine Control / Fuel System - "Engine Control Module")

4.	Perform TCM learning after replacing the transaxle to prevent slow transaxle response, jerky acceleration and jerky startup. (Refer to Automatic Transaxle Control System - "Repair procedures")

Transaxle Control Module (TCM) Schematic Diagrams

TCM Connector and Terminal Function TCM Terminal Function Connector [A] Connector [K] PinDescriptionPinDescriptionA1Overdrive clutch control solenoid valve(OD/C_VFS)K8FLEXRAY COMM. Signal HIGHA5 ...

Transaxle Oil Temperature Sensor Description and Operation

Description • Transaxle oil temperature sensor monitors the automatic transaxle fluid's temperature and conveys the readings to TCM. • It is an NTC (Negative Thermal Coefficient) senso ...

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