Hyundai Santa Fe: Engine Control System / Engine Control Module (ECM). Repair procedures

Hyundai Santa Fe (TM) 2019-2024 Service Manual / Engine Control/Fuel System / Engine Control System / Engine Control Module (ECM). Repair procedures

Removal
  
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 the immobilizer must be performed procedure as below.
[In the case of installing used ECM]
1)
Perform "ECM Neutral mode" procedure with diagnostic tool.
(Refer to Body Electric System - "Immobilizer System")
2)
After finishing "ECM Neutral mode", perform "Key teaching" procedure with diagnostic tool.
(Refer to Body Electric System - "Immobilizer System")
[In the case of installing new ECM]
Perform "Key teaching" procedure with diagnostic tool.
(Refer to Body Electric System - "Immobilizer System")
  
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 diagnostic tool.
(Refer to Body Electric System - "Smart Key")
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 the ignition switch OFF and disconnect the battery negative (-) terminal.
2.
Remove the air cleaner assembly.
(Refer to Engine Mechanical System - "Air Cleaner")
3.
Disconnect the ECM connector (A).

4.
Remove the mounting bolt (A) and nuts (B), and then remove the ECM (C).

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 diagnostic tool.
(Refer to Body Electric System - "Immobilizer System")
2)
After finishing "ECM Neutral mode", perform "Key teaching" procedure with diagnostic tool.
(Refer to Body Electric System - "Immobilizer System")
[In the case of installing new ECM]
Perform "Key teaching" procedure with diagnostic tool.
(Refer to Body Electric System - "Immobilizer System")
  
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 diagnostic tool.
(Refer to Body Electric System - "Smart Key")
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 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 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, 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)
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.
Turn OFF the ignition switch.
2.
Connect the diagnostic tool to Data Link Connector (DLC).
3.
Turn ON the ignition switch.
4.
Select "Vehicle, Model Year, Engine, System".
5.
Select "Vehicle S/W Management".
6.
Select "Write VIN".

7.
Input the VIN.
  
Before inputing the VIN, confirm the VIN again because the programmed VIN cannot be changed.

    Engine Control Module (ECM). Schematic diagrams

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    ETC (Electronic Throttle Control) System

    ..

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    Engine oil pressure warning light. Low fuel level warning light

    Engine oil pressure warning light

    This warning light illuminates:

    When the engine oil pressure is low.

    If the engine oil pressure is low:

    1. Drive carefully to the nearest safe location and stop your vehicle.

    2. Turn the engine off and check the engine oil level (For more details, refer to “Engine Oil” section in chapter 9). If the level is low, add oil as required.

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