Engine Controls - Warm Ambient Temp. Cold Start Stumble
Group: ENGINE ELECTRICALNumber: 04-36-004
Date: APRIL, 2004
Model: 2001-2003 ELANTRA
Subject
2001-2003 ELANTRA ECM REPROGRAMMING FOR WARM AMBIENT COLD START STUMBLE (WACSS) AND ENGINE HESITATION AT APPROXIMATELY 3800 RPM
DESCRIPTION:
Some 2001-2003 MY Elantra vehicles may experience one or both of the following symptoms:
1. Warm ambient cold start stumble (WACSS). When the weather is hot and humid, the engine may hesitate for a short time after an initial cold start (typically, the first start in the morning).
2. Engine hesitates at 3800 to 4000 rpm.
This bulletin describes a procedure for updating the Engine Control Module (ECM) to correct the above conditions by using the Hi-Scan Pro.
VEHICLES AFFECTED:
^ Model: 2001-2003 ELANTRA vehicles
^ Affected vehicle production date range:
- 4 Door: Produced through June 14, 2003
- 5 Door: Produced through June 10, 2003
ECM REPROGRAMMING SPECIFICATIONS:
ERASING ECM ADAPTATION VALUES BEFORE REPROGRAMMING:
Before reprogramming the ECM, first erase ECM adaptation values by following the procedure below:
1. Using the Hi-Scan Pro with the SOL System Card Installed, choose the HyundaiDiagnostic Menu.
2. Choose the correct model.
3. Choose the engine menu.
4. Choose the correct model year.
5. Choose menu number 10 for "RESETTING ADAPTIVE VALUES."
6. With the key in the "ON" position and the engine not running, press the F1 button to reset the adaptation values.
CAUTIONS DURING REPROGRAMMING:
1. Conduct reprogramming with the ignition key in the "ON" position.
2. Be careful not to disconnect any cables connected to the vehicle or Hi-Scan Pro during reprogramming.
WARNING:
If reprogramming is interrupted, the manual update procedure must be used.
3. Do not start the engine during reprogramming.
4. Do not turn the ignition key off during reprogramming.
5. When the reprogramming is completed, turn off the ignition key for 20 seconds before starting the engine.
REPROGRAMMING PROCEDURE:
NOTE:
Verify that the vehicle is affected by identifying the vehicle production date.
AUTOMATIC UPDATE PROCEDURE:
1. Install the Data Link Connector (DLC) cable to the Hi-Scan Pro main body and tighten the 2 bolts securely.
2. Remove the current software card from the Hi-Scan Pro and insert the reprogramming software card with the new ECM program into the Hi-Scan Pro top slot.
3. Plug the DLC cable from the Hi-Scan Pro into the data link connector (16 pin connector) under the driver's side instrument panel.
4. Turn the ignition to the ON position.
5. Turn the Hi-Scan Pro ON and press ENTER.
6. Select option "36. XD 2.0 WACSS & HESITATION IMPROV." and press ENTER.
7. Select option "01. XD 2.0 WACSS & HESITATION [AUTO MODE]" and press ENTER.
8. Enter "1229" as the password for automatic update mode and press ENTER.
9. The Hi-Scan Pro will establish communication and check the ECM ID. The Hi-Scan Pro will reprogram the ECM automatically.
NOTES:
^ The Hi-Scan Pro detects the current ECM ID (affected) and assigns the new ECM ID (target) and displays them on the Hi-Scan Pro screen.
^ If the Hi-Scan Pro does not download the program, use the Manual Update Procedure following this section.
^ Check the ECM IDs displayed on the Hi-Scan Pro screen to verify that the correct ECM software is being downloaded by referring to the "ECM Specifications Table" shown on page 2 of this bulletin.
WARNING:
Do not interrupt the reprogramming at any time. The ECM will be rendered inoperative if the program does not download completely.
10. When the "REPROGRAMMING COMPLETED" message is displayed, the ECM reprogramming process is complete.
11. Turn the ignition to the OFF position for 20 seconds and then start the engine and check for proper operation.
12. Check for diagnostic trouble codes using the Hi-Scan Pro with the system software card. Erase all trouble codes.
MANUAL UPDATE PROCEDURE:
NOTE:
In the event that option "01. XD 2.0 WACSS & HESITATION [AUTO MODE]" fails to download the new ECM program, option "02. XD 2.0 WACSS & HESITATION [ERROR MODE]" must be used.
NOTE:
Confirm all connections are established as shown in the "AUTOMATIC UPDATE PROCEDURE" before continuing.
1. Turn the ignition to the ON position.
2. Turn the Hi-Scan Pro ON and press ENTER.
3. Select option "36. XD 2.0 WACSS & HESITATION IMPROV." and press ENTER.
4. Select option "02. XD 2.0 WACSS & HESITATION [ERROR MODE]" and press ENTER.
5. Choose the vehicle type which is correct for your vehicle by using the "ECM Specifications Table shown on page 2 of this bulletin. Then press ENTER.
6. Select the correct password for the manual update mode which is correct for the vehicle specification by referring to the chart. Then press ENTER.
WARNING:
Be sure to input the correct password. If an incorrect password is selected, the correct program will not be downloaded.
7. Wait until the reprogramming is completed.
NOTE:
Check the ECM ID displayed on the Hi-Scan Pro screen to verify that the correct ECM software is being downloaded by referring to the "ECM Specifications Table" shown in this bulletin.
8. When the "REPROGRAMMING COMPLETED" message is displayed, the ECM reprogramming process is complete.
9. Turn the ignition to the OFF position for 20 seconds and then start the engine and check for proper operation.
10. Check for diagnostic trouble codes using the Hi-Scan Pro with the system software card. Erase all trouble codes.
EXPLANATION OF ERROR MESSAGE:
1. "INVALID PASSWORD": Please enter the correct password again.
2. "REPROGRAMMING ERROR, PLEASE WAIT FOR RETRY": An error occurred during reprogramming, the Hi-Scan Pro will retry the reprogramming automatically.
3. "THIS ECM IS DIFFERENT TYPE": The ECM on this vehicle is not the type subject to this reprogramming procedure.
4. "ALREADY REPROGRAMMED": This reprogramming has previously been done on this vehicle.
5. "REPROGRAM ERROR, PLEASE CHECK THE SYSTEM": In this case, you must reprogram manually after selecting the menu option "02. XD 2.0 WACSS & HESITATION [ERROR MODE]".
WARRANTY INFORMATION: