CX-7 AWD L4-2.3L Turbo (2008)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine Controls - Rough Idle/Stall/MIL/DTC P2177/P2187
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.
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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
