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Hyundai Equus: Engine Control Module (ECM) Repair procedures - Engine Control System - Engine Control/Fuel System - Hyundai Equus VI 2009-2021 Service ManualHyundai Equus: Engine Control Module (ECM) Repair procedures

Removal
   
When replacing the ECM, the vehicle equipped with the immobilizer must be performed procedure as below.
[In the case of installing used ECM]
1) Perform "ECM Neutral mode" procedure with GDS. (Refer to "Immobilizer" in BE group)
2) After finishing "ECM Neutral mode", perform "Key teaching" procedure with GDS. (Refer to "Immobilizer" in BE group)
[In the case of installing new ECM]
Perform "Key teaching" procedure with GDS. (Refer to "Immobilizer" in BE group)
   
When replacing the ECM, the vehicle equipped with the smart key system (Button start) must be performed procedure as below.
[In the case of installing used ECM]
1) Perform "ECM Neutral mode" procedure with GDS. (Refer to "Smart key" in BE group)
2) After finishing "ECM Neutral mode", insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the ECM learns the smart key information automatically.
[In the case of installing new ECM]
Insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the ECM learns the smart key information automatically.
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the ECM & TCM cover (A).

3.
Disconnect the front harness (A), and then disconnect the ECM connector (B) and the TCM connector (C).
4.
Remove the harness installation nut (D) and ground bolt (E), and then remove the harness (F).
5.
Remove the ECM & TCM bracket installation bolts (G) and nut (H).

6.
After removing the installation nuts (A), remove the TCM (B) from the bracket

7.
After removing the installation nuts (A), remove the ECM (B) from the bracket

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

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

ECM Problem Inspection Procedure
1.
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 1x

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, replace the ECM with a new one, and then check the vehicle again. If the vehicle operates normally then the problem was likely with the ECM.
4.
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 Resister".

3.
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
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    Injector Drive Box (IDB) Schematic Diagrams
    Injector Drive Box (IDB) IDB Connector ECM Terminal Function Connector [C200-IDB] Pin No.DescriptionConnected to1ECM groundChassis ground2ECM groundChassis ground3Battery power (B+)Main rela ...

    See also:

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    Remove 1. Turn ignition switch OFF and disconnect the negative (-) battery cable. 2. Remove the IDB cover (A). 3. Disconnect the IDB Connector (A). 4. Remove the mounting bolts (B), an ...

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