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

Removal
   
When replacing the ECM, the vehicle equipped with immobilizer must be performed the procedure as below.
[In the case of installing used ECM]
1.
Perform "Neutral mode" procedure with GDS. (Refer to "Immobilizer" in BE group)
2.
Insert the key and turn it to the IGN ON and OFF position. Then the ECM key register process is completed automatically.
[In the case of installing new ECM]
-
Insert the key and turn it to the IGN ON and OFF position.
Then the ECM key register process is completed automatically.
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Disconnect the ECM Connector (A).

3.
Remove the air cleaner assembly.
(Refer to Engine Mechanical System - "Air Cleaner")
4.
Remove the mounting bolts (A) and nut (B), and then remove the ECM (C).

5.
Remove the ECM (B) after removing 4 nuts (A) from the bracket.

Installation
   
When replacing the ECM, the vehicle equipped with immobilizer must be performed the procedure as below.
[In the case of installing used ECM]
1.
Perform "Neutral mode" procedure with GDS. (Refer to "Immobilizer" in BE group)
2.
Insert the key and turn it to the IGN ON and OFF position. Then the ECM key register process is completed automatically.
[In the case of installing new ECM]
-
Insert the key and turn it to the IGN ON and OFF position.
Then the ECM key register process is completed automatically.
1.
Install in the reverse order of removal.

ECM installation nut:
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
ECM bracket installation nut/bolt:
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 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.
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).
Engine Control Module (ECM) Schematic Diagrams
ECM Terminal And Input/Output signal ECM Terminal Function Connector [C500-A] Pin No.DescriptionConnected to1Injector (Cylinder #3) [High] control outputInjector (Cylinder #3)2Injector (Cylinde ...

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Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Components and Components Location
Component Location 1. Start Stop Button(SSB)2. FOB key3. Trunk lid switch4. Body control module (BCM)5. Interior antenna 16. Interior antenna 27. Smart key unit8. Trunk antenna9. Door handle & door antenna10. Bumper antenna ...

Hyundai Sonata LF 2014-2019 Service Manual: Description and Operation
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