Engine Controls - Cold Start Rough Idle/MIL ON/DTC P0300
Group: ENGINE ELECTRICALNumber: 07-36-004-1
Date: AUGUST, 2007
Model:
2007 ACCENT
Subject:
ECM UPDATE - ROUGH IDLING DURING INITIAL COLD START-UP PERIOD AND MAY SET DTC P0300
THIS BULLETIN SUPERSEDES TSB 07-36-004
DESCRIPTION:
This bulletin provides the procedure to update the ECM software of some 2007 ACCENT (MC) 1.6L vehicles, which may experience rough idling during the initial cold start-up period and illuminate the check engine light with a DTC P0300.
NOTE:
Please be aware that this update does not address other potential causes for misfire. This update only addresses the brief roughness that may occur within 40 seconds after the start of a cold engine, after which the engine idle would return to normal.
If the vehicle has a misfire condition all the time with check engine light flashing, or the misfire has been occurring during driving with warm engine, this TSB's ECM reflash will not be a solution. You must diagnose for other causes of misfire.
APPLICABLE VEHICLES:
^ Model: 2007 model year ACCENT (MC) 1.6L vehicles.
^ Applicable vehicle production date range: From start of 2007 ACCENT (MC) production to 11/20/06.
NOTE:
Verify the ECM ROM ID version before attempting to upgrade the vehicle's ECM software. Refer to the ROM ID Information Table below.
ROM ID INFORMATION TABLE
CAUTIONS DURING REPROGRAMMING:
1. Make sure the battery has reasonable charge. If the vehicle has been in storage for days run the engine at idle for at least 15 minutes to assure an adequate battery charge for reliable reprogramming results.
2. Perform reprogramming with the ignition key in the ON position.
3. Turn off all lights (Do not leave headlight switch in auto mode.) and all accessories (including heater/air conditioner/blower, radio, heated seats, rear defroster, etc.) to make certain the battery will not be discharged during reprogramming.
4. Be careful not to disconnect any cables connected to the vehicle, the GDS or the Hi-Scan Pro during reprogramming.
5. Do not start the engine during reprogramming.
6. Do not turn the ignition switch OFF during reprogramming.
ECM REPROGRAMMING PROCEDURE:
GDS INSTALLATION PROCEDURE
WARNING:
Make sure that the battery symbol indicator at the bottom right tray of the GDS laptop shows at least 25% so there will be enough power to handle the reprogram; if it has less, charge the GDS laptop by connecting the power adaptor cable for at least 1/2 hour or leave it connected during the reprogram procedure if possible.
1. Connect the USB cable between the GDS laptop USB port and the VCI.
NOTE:
When performing the reprogramming using the GDS, wireless communication between the VCI and GDS laptop cannot be used; you must connect the USB cable between the GDS laptop and the VCI.
2. Connect the VCI cable to the vehicle's DLC connector; to access the vehicle's connector you must remove the front cover below the steering wheel to the left.
3. Turn on the VCI and GDS laptop, and then perform reprogramming in accordance with the instructions of the below procedure:
AUTOMATIC REPROGRAMMING PROCEDURE:
Internet Update:
Touch the Internet Update to check that your GDS has Local Version 1.25 or higher. Here's an example of an Internet Update available to Server Version 1.25 with the current GDS Local Version at 1.24 so the Download Start button is available to conduct the internet update:
1. Enter the vehicle information either automatically by pressing the VIN Auto Detect button or, if it does not work, manually enter the vehicle model, model year, and select ENGINE as the system:
2. Select ECU Upgrade:
3. Select Auto Mode then ENGINE at the left ECU Upgrade column and you will get the screen shown.
4. After touching OK it will read the ROM ID as shown.
5. After the Current ROM ID is displayed select Upgrade Event # 85 as shown.
6. After touching the Upgrade button touch OK on the screen.
7. The vehicle battery voltage is checked to make sure it's at least 12 volts as required to assure reliable reprogramming results. Touch OK on this screen if the results indicate Voltage is OK.
WARNING:
If voltage is below 12 volts then touch Cancel; run the engine for 10 minutes at idle and touch OK again at the previous screen to check that battery voltage then exceeds 12 volts.
8. Reprogramming will begin and progress of the reprogramming will appear on the bar graph as shown.
9. When 100% is reached on the bar graph it is not finished; you must then wait until the next screen which indicates reprogramming is complete.
10. Check for any engine or transmission section diagnostic trouble codes (DTCS) and erase any trouble codes present.
11. Turn the vehicle ignition switch OFF for about 20 seconds and then start the engine to confirm proper operation of the vehicle.
MANUAL REPROGRAMMING PROCEDURE:
CAUTION:
^ Manual reprogramming must be performed only when automatic reprogramming fails.
^ If automatic reprogramming fails, turn the ignition switch OFF for about 20 seconds, place it back in the ON position and then perform manual reprogramming.
1. Within the ECU Upgrade screen select Manual Mode followed by ENGINE in the left column, then select Upgrade Event # 85 and referring to the above table select the appropriate ECU part number and touch OK.
2. Enter the appropriate Password from the above table and then touch OK.
3. The battery voltage must be above 12 volts for reliable reprogram results so if the result is good then touch OK otherwise touch cancel and run the engine at idle for 10 minutes to recharge the battery and then retry.
4. Reprogramming will occur until 100% is indicated in the bar graph. Wait for the follow-up final screen to indicate actual completion.
5. Check for any engine or transmission section diagnostic trouble codes (DTCS) and erase any trouble codes present.
6. Turn the vehicle ignition switch OFF for about 20 seconds and then start the engine to confirm proper operation of the vehicle.
WARRANTY INFORMATION