Hyundai Elantra: Engine Control System / Engine Control Module (ECM) Repair procedures

Hyundai Elantra AD (2016-2020) Service Manual / Engine Control/Fuel System / Engine Control System / Engine Control Module (ECM) Repair procedures

Removal

•

When replacing the ECM, the vehicle equipped withthe immobilizer must be performed procedure asbelow.

[In the case of installing used ECM]

1) Perform "ECM Neutral mode" procedure with GDS.

(Refer to Body Electrical System - "Immobilizer System")

2) After finishing "ECM Neutral mode", perform "Keyteaching" procedure with GDS.

(Refer to Body Electrical System - "Immobilizer System")

[In the case of installing new ECM]

Perform "Key teaching" procedure with GDS.

(Refer to Body Electrical System - "Immobilizer System")

•

When replacing the ECM, the vehicle equipped withthe smart key system (Button start) must beperformed procedure as below.

[In the case of installing used ECM]

1) Perform "ECM Neutral mode" procedure with GDS.

(Refer to Body Electrical System - "Immobilizer System")

2) After finishing "ECM Neutral mode", insert the key(or press the start button) and turn it to the IGN ONand OFF position. Then the ECM learns the smartkey information automatically.

[In the case of installing new ECM]

Insert the key (or press the start button) and turn itto the IGN ON and OFF position. Then the ECMlearns 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.	Disconnect the ECM Connector (A).

4.	Remove the mounting bolts (A) and then remove the ECM (B).

Installation

•

When replacing the ECM, the vehicle equipped withthe immobilizer must be performed procedure asbelow.

[In the case of installing used ECM]

1) Perform "ECM Neutral mode" procedure with GDS.

(Refer to Body Electrical System - "Immobilizer System")

2) After finishing "ECM Neutral mode", perform "Keyteaching" procedure with GDS.

(Refer to Body Electrical System - "Immobilizer System")

[In the case of installing new ECM]

Perform "Key teaching" procedure with GDS.

(Refer to Body Electrical System - "Immobilizer System")

•

When replacing the ECM, the vehicle equipped withthe smart key system (Button start) must beperformed procedure as below.

[In the case of installing used ECM]

1) Perform "ECM Neutral mode" procedure with GDS.

(Refer to Body Electrical System - "Immobilizer System")

2) After finishing "ECM Neutral mode", insert the key(or press the start button) and turn it to the IGN ONand OFF position. Then the ECM learns the smartkey information automatically.

[In the case of installing new ECM]

Insert the key (or press the start button) and turn itto the IGN ON and OFF position. Then the ECMlearns the smart key information automatically.

Installation is reverse of removal.

ECM installation bolt :

7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)

ECM bracket installation bolt :

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

ECM Problem Inspection Procedure

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

Specification : Below 1?

2.	TEST ECM CONNECTOR: Disconnect the ECM connector and visually check the ground terminals on ECM 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 ECM could be faulty. If so, make sure there were no DTC's before swapping the ECM with a new one, and then check the vehicle again. If DTC's were found, examine this first before swapping ECM.

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

VIN Programming Procedure

VIN (Vehicle Identification Number) is a number that has the vehicle's information (Maker, Vehicle Type, Vehicle Line/Series, Body Type, Engine Type, Transmission Type, Model Year, Plant Location and so forth. For more information, please refer to the group "GI" in this SERVICE MANUAL). When replacing an ECM, the VIN must be programmed in the ECM. If there is no VIN in ECM memory, the fault code (DTC P0630) is set.

•	The programmed VIN cannot be changed. When writing the VIN, confirm the VIN carefully.

1.	Select "VIN Writing" function in "Vehicle S/W Management".

2.	Select "Write VIN" in "ID Register".

Input the VIN.

•	Before inputing the VIN, confirm the VIN again because the programmed VIN cannot be changed.

4.	Turn the ignition switch OFF, then back ON.

Engine Control Module (ECM) Schematic Diagrams

ECM Terminal And Input/Output signal Harness Connector ECM Terminal Function Connector [C300-A] Pin No.DescriptionConnected to1- 2ETC Motor [+] control outputETC Motor3- 4Motor [-] control o ...

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