Engine Controls - Rough Idle/Stall/MIL/DTC P2177/P2187

Discussion in '2007' started by JustROLLIN, Jan 7, 2009.

  1. JustROLLIN

    JustROLLIN Guest

    Bulletin No.: 01-022/08

    Last Issued: 04/02/2008

    Subject:
    ROUGH IDLE, LACK OF POWER, AND/OR MIL ON WITH DTC P2177/P2187 (FUEL SYSTEM LEAN)

    BULLETIN NOTE This bulletin supersedes the previous bulletin issued on 03/27/08. The REPAIR PROCEDURE has been revised.

    APPLICABLE MODEL(S)/VINs
    2007-2008 Mazdaspeed3 vehicles with VINs lower than JM1BK**** ** 859606 (produced before November 22, 2007)

    2006-2007 Mazdaspeed6 vehicles

    2007-2008 CX-7 vehicles with VINs lower than JM3ER**** ** 196510 (produced before November 19, 2007)

    DESCRIPTION

    Due to low fuel pressure at the high-pressure fuel pump, some vehicles may experience the following:

    ^ Rough idle, stall, and/or hesitation under cold conditions.

    ^ Intermittent lack of power during acceleration when the engine gets hot.

    ^ MIL turns on with DTC P2177/P2187 (fuel system too lean at off idle).


    This is caused by a delayed fuel pressure build-up from the high pressure fuel pump. There are two main reasons for this:

    1. The drive current from the PCM is not enough for some fuel pumps.

    2. Some fuel pumps have slower response.


    To fix the problem, the PCM software and the specification of the high-pressure fuel pump have been changed.

    Customers having this concern should have their vehicle repaired using the following repair procedure.

    REPAIR PROCEDURE

    1. Reboot the IDS to clear memory before reprogramming.

    2. Using IDS 51.9 or later software, reprogram the PCM to the latest calibration (refer to "Calibration Information" table) by following the "Module Reprogramming" procedure.

    NOTE: ^ Always update the IDS tool first, then follow on-screen instructions to download the needed calibration file for PCM reprogramming.

    ^ It is not necessary to remove any fuses or relays during PCM reprogramming when the IDS screen prompts you to do so. You may accidentally stop power to one of the PCM terminals and cause the PCM to be blanked, or you may receive error messages during the IDS reprogramming procedure.

    ^ IDS shows the calibration part numbers after programming the PCM. Please be aware that PCM calibration part numbers and file names listed in any Service Bulletin may change due to future releases of IDS software, and additional revisions made to those calibrations for service related concerns.

    ^ When reprogramming a PCM, IDS will always display the "latest" calibration P/N available for that vehicle. If any calibration has been revised/updated to contain new information for a new service concern/issue, it will also contain all previously released calibrations.

    ^ When performing this procedure, we recommend that a battery charger be installed on the vehicle battery and turned ON to a maximum charge of no more than 20 AMPS to keep the vehicle battery up to capacity. If you exceed 20 AMPS, it could damage the VCM.


    3. For vehicles built before April 7, 2007 that are experiencing the conditions as noted in this service bulletin after the PCM calibration update, perform a Warranty Vehicle Inquiry using your eMDCS System and inspect Warranty Claim Inquiry Detail for high-pressure fuel pump replacement.

    ^ If no prior history of replacement, replace the high-pressure fuel pump. Refer to MS3 online instructions or Workshop Manual section 01-14 FUEL PUMP UNIT REMOVAL/INSTALLATION.

    ^ If the history indicates part number L3K9-13-35ZB was used during a repair, use the illustration shown above to inspect the production date of the high-pressure fuel pump. Replace it if the production date is before March 26, 2007.
    CAUTION: When replacing the high-pressure fuel pump, it is very important to make sure that the tension collar is present before reinstalling the pump. Failure to do so will result in excessive engine noise and the subsequent failure of the high-pressure fuel pump and its cam lobes.

    4. After performing the PCM reprogramming procedure, verify the repair by starting the engine and making sure there are no MIL illumination or abnormal warning lights present.

    NOTE: ^ If any DTCs should remain after performing DTC erase, diagnose the DTCs according to the appropriate Troubleshooting section of the Workshop Manual.

    ^ After PCM reprogramming, it is no longer necessary to road test the vehicle to "relearn" KAM (Keep Alive Memory).

    5. Fill out an "Authorized Modifications" label (P/N 9999-95-AMDC-97) with the new PCM calibration information, your dealer code, and today's date.

    6. Place the "Authorized Modifications" label on the "A" pillar below the tear tag in the driver door jamb.
     

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