Engine Controls - Rough Idle/Hesitation
TSB: 01-015/06
2006 MAZDA6 - 2.3L - ENGINE HESITATION OR ROUGH IDLE
APPLICABLE MODEL(S)/VINS
2006 Mazda6 with 2.3L meeting Federal and Mexico specifications (produced February 27, 2006 or later).
2006 Mazda6 with 2.3L and A/T meeting CA specifications (produced March 6, 2006 or later).
DESCRIPTION
A hesitating occurs on A/T vehicles under the following conditions:
- Just after re-starting a hot engine in a high elevation area and/or a high ambient temperature condition (113 degrees Fahrenheit or higher). This is caused by improper ignition timing control for high elevation and high ambient temperatures.
- When starting with a cold engine (coolant temperature less than 86 degree Fahrenheit). This is caused by a lean air-fuel mixture for a cold start.
- When starting at a creeping speed or lower with a half warmed-up engine (coolant temperature is 104 140 degrees Fahrenheit), and your foot is lightly placed on the accelerator pedal. This is caused by a lean air-fuel mixture just after the variable valve timing (VVT) started operating on Federal and Mexico specification vehicles or improper engine rpm control when the advanced warm-up system is operating on CA specification vehicles.
A rough idle occurs under the following conditions:
- When the A/C is turned on and/or the power steering is operated on vehicles with M/T or A/T meeting Federal or Mexico specifications. This is caused by improper compensation of the engine rpm for the A/C and power steering systems.
- When the A/C is turned on, then off within 10 seconds on vehicles with A/T and auto A/C meeting CA specifications. This is caused by actual engine rpm not meeting the specification when the A/C is switched on, then off in such a short time.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Reboot the PDS/IDS to clear memory before reprogramming.
2. Using PDS/IDS 42.6 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 PDS/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 PDS/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 PDS/IDS reprogramming procedure.
- PDS/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 PDS/IDS software, and additional revisions made to those calibrations for service related concerns.
- When reprogramming a PCM, PDS/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 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).
4. 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.
5. Place the "Authorized Modifications" label on the "A" pillar below the tear tag in the driver door jamb.
CALIBRATION INFORMATION
NOTE: The PCM Calibration Part Numbers listed above are provided for PCM reprogramming purposes only. These are not necessarily the same Mazda part numbers used to order an actual PCM through the Mazda Parts System. It is not necessary to order a PCM as part of this repair procedure.
WARRANTY INFORMATION
NOTE:
- This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair. Refer to the Warranty Wizard for warranty term information.
- Additional diagnostic time cannot be claimed for this repair.