Hyundai Sonata: Engine Control Module (ECM) Repair procedures - Engine Control System - Engine Control / Fuel SystemHyundai Sonata: 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).
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