Kia Cadenza: Automatic Transaxle Control System / Transaxle Control Module (TCM) Repair procedures

Kia Cadenza YG 2016-2024 Service Manual / Automatic Transaxle System / Automatic Transaxle Control System / Transaxle Control Module (TCM) Repair procedures

Removal
   
When replacing the TCM, the vehicle equipped with the immobilizer must be performed procedure as below.
[In the case of installing used TCM]
1)
Perform "TCM Neutral mode" procedure with GDS.
(Refer to Body Electrical System - "Immobilizer System")
2)
After finishing "TCM Neutral mode", perform "Key teaching" procedure with GDS.
(Refer to Body Electrical System - "Immobilizer System")
[In the case of installing new TCM]
Perform "Key teaching" procedure with GDS.
(Refer to Body Electrical System - "Immobilizer System")
   
When replacing the TCM, the vehicle equipped with the smart key system (Button start) must be performed procedure as below.
[In the case of installing used TCM]
1)
Perform "TCM Neutral mode" procedure with GDS.
(Refer to Body Electrical System - "Immobilizer System")
2)
After finishing "TCM Neutral mode", insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the TCM learns the smart key information automatically.
[In the case of installing new TCM]
Insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the TCM learns the smart key information automatically.
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the battery.
(Refer to Engine Electrical System - "Battery")
3.
Remove the air cleaner assembly.
(Refer to Engine Mechanical System - "Air Cleaner")
4.
Disconnect the TCM Connector (A).

5.
Remove the mounting bolts (A) and nut (B), and then remove the TCM (C).

Installation
   
When replacing the TCM, the vehicle equipped with the immobilizer must be performed procedure as below.
[In the case of installing used TCM]
1)
Perform "TCM Neutral mode" procedure with GDS.
(Refer to Body Electrical System - "Immobilizer System")
2)
After finishing "TCM Neutral mode", perform "Key teaching" procedure with GDS.
(Refer to Body Electrical System - "Immobilizer System")
[In the case of installing new TCM]
Perform "Key teaching" procedure with GDS.
(Refer to Body Electrical System - "Immobilizer System")
   
When replacing the TCM, the vehicle equipped with the smart key system (Button start) must be performed procedure as below.
[In the case of installing used TCM]
1)
Perform "TCM Neutral mode" procedure with GDS.
(Refer to Body Electrical System - "Immobilizer System")
2)
After finishing "TCM Neutral mode", insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the TCM learns the smart key information automatically.
[In the case of installing new TCM]
Insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the TCM learns the smart key information automatically.
1.
Install in the reverse order of removal.

TCM installation bolt:
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m,7.2 ~ 8.7 lb-ft)
TCM bracket installation bolt/nut:
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m,7.2 ~ 8.7 lb-ft)

   
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")
TCM Problem Inspection Procedure
1.
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 1Ω

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.
4.
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).
Transaxle Control Module (TCM) Schematic Diagrams
1. TCM connector and terminal function 2. TCM terminal function Connector [A] PinDescriptionPinDescription1-45Inhibitor switch signal ''S2''2-46Inhibitor switch signal ''S3''3-47Inhibitor swi ...

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 Negative Thermal Coefficient(NTC) sensor whose resis ...

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