A/T Controls - Power Reduction When Climbing a Hill
Bulletin No.: 05-008/08Last Issued: 5/23/2008
Subject:
REDUCTION IN POWER WHEN CLIMBING A STEEP HILL
APPLICABLE MODEL(S)/VINS
2007-2008 CX-7 vehicles with VINs lower than JM3 ER**** ** 215746 (produced before May 1, 2008)
2007-2008 CX-9 vehicles with VINs lower than JM3 TB**** ** 159178 (produced before May 1, 2008)
DESCRIPTION
Some customer may complain that the vehicle power is reduced suddenly when climbing a steep hill. After a couple of minutes of idling, the symptom disappears. No DTC is stored.
The TCM limits the torque at lower load than required to protect the ATX causing the reduction in power. As a mass-production change the TCM programming has been modified and DTC P1783 has been established for the torque limitation at high ATF temperature.
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 B54.4 or later software, reprogram the TCM 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 TCM reprogramming.
^ It is not necessary to remove any fuses or relays during TCM reprogramming when the IDS screen prompts you to do so. You may accidentally stop power to one of the TCM terminals and cause the TCM to be blanked, or you may receive error messages during the IDS reprogramming procedure.
^ IDS shows the calibration part numbers after programming the TCM.
^ Please be aware that TCM 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 TCM, 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. After performing the TCM 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 TCM reprogramming, it is no longer necessary to road test the vehicle to "relearn" KAM (Keep Alive Memory).
CALIBRATION INFORMATION
WARRANTY INFORMATION
NOTE:
^ This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
^ This repair will be covered under Mazda's New Vehicle Limited Warranty term.
^ Additional diagnostic time cannot be claimed for this repair.
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