Hyundai Accent: Engine Control System / Engine Control Module (ECM)

- ECM Terminal and Input/Output signal [M/T]

ECM Terminal Function (M/T)

ECM Terminal Function (A/T)

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 1Ω

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 Procedure in Basic Inspection Procedure)

• If you replace the PCM, you must perform oil pressure characteristics back up & input (TCU Replacement).(Refer to Automatic Transaxle System - "Automatic Transaxle Control System")

• When replacing the ECM, the vehicle equipped with immobilizer must be performed the procedure as below.

1)Perform "ECM neutralization mode" procedure with GDS.(Refer to Body Electrical System - "Immobilizer System")

2)Insert the key and turn it to the IGN ON and OFF position. Then the ECM key register process is completed automatically.

– 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.Remove the battery.(Refer to Engine Electrical System - "Battery")

3.Disconnect the ECM connector (A).

4.Remove the bracket installation bolts & nut (A), and then remove the ECM (B).

ECM Installation bolt & nut :7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)

5.Remove the installation nuts (A), and then remove the ECM (B) from the bracket.

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

• When replacing the ECM, the vehicle equipped withthe immobilizer must be performed procedure as below.

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")

– 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.

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.

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

1. Installation is reverse of removal.

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 1Ω

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.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)

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

1.Turn the ignition switch OFF.

2.Connect the GDS to Data Link Connector (DLC).

3.Turn the igntion switch ON.

4.Select "Vehicle, Model Year, Engine, System".

5.Select "Vehicle S/W Management".

6.Select "Write VIN".