A/T - 1-2, 2-3, 3-2 Shift Shock: Overview
TSB: 05-008/072002-2003 MPV - SHIFT SHOCK - TRANSMISSION CONTROL MODULE (TCM) REFLASH
NOTE:
This bulletin replaces 05-001/04. Please update your records accordingly.
BULLETIN NOTE
This bulletin supersedes the previous bulletin 05-001/04 issued 5/20/04. The DESCRIPTION and REPAIR PROCEDURE have been revised.
APPLICABLE MODEL(S)/VINS
All 2002 - 2003 MPV with VINs up to JM3LW28**30367821
DESCRIPTION
The vehicle's automatic transaxle (ATX) may exhibit shift shock while the engine warms from cold to normal operating temperature. The symptom is intermittent, it does not occur all the time. The shift shock usually occurs during 1-2 or 2-3 upshifts, or 3-2 part throttle downshifts.
In most cases, the cause of the shift shock is from the TRANSMISSION CONTROL MODULE (TCM) software calibration. An updated software calibration is available on the Mazda Service Support System (MS3) to correct the shifting concerns.
Customers having this concern should have their vehicle repaired according to the following repair procedure.
VEHICLE PRE-INSPECTION
Inspect the vehicle for a "Port Campaign" rework sticker affixed to the underside of the hood.
NOTE:
^ If a "Port Campaign" rework sticker with the number "04/B0/02" is affixed to the hood, the TCM Re-flash has already been performed at the port. DO NOT re-flash the TCM. Use M-MDS to check for DTCs and repair the ATX according to the workshop manual.
^ If there is no "Port Campaign" rework sticker affixed to the hood, perform the TCM Re-flash. Proceed to the "REPAIR PROCEDURE".
REPAIR PROCEDURE
1. Check transaxle fluid level and add fluid as needed.
2. Road test the vehicle to confirm the concern.
3. Use M-MDS to check for DTCs.
^ If DTC(s) are retrieved, follow the troubleshooting procedures in the Workshop Manual for specific DTCs. If the shift shock concern is still present after repairs are made, proceed to Step 4.
4. Write down the customer's radio station pre-sets.
5. Disconnect the negative battery cable.
6. Remove the TRANSMISSION CONTROL MODULE (TCM) from the vehicle according to the Workshop Manual (Section 05-17 TCM REMOVAL/INSTALLATION).
7. Re-flash the TCM according to the following procedures:
NOTE:
M-MDS WILL NOT BE USED to perform TCM reflash. A desktop PC with internet access and one available serial port is required.
^ If PC does not already have flashing software installed, proceed to "PROCEDURE 1: INSTALLING FLASHING SOFTWARE". Flashing software only needs to be installed one (1) time on the PC.
^ If using flash kit and flashing software for the first time (after software has been installed), proceed to "PROCEDURE 2: FIRST TIME TCM RE-FLASH".
^ If PC has flashing software installed and "PROCEDURE 2: FIRST TIME TCM RE-FLASH" has been competed at least one (1) time, proceed to "PROCEDURE 3: QUICK RE-FLASH" for fast re-flashing.
NOTE:
Complete Steps 8-16 below, AFTER the TCM has been reflashed.
8. Reinstall the reprogrammed TCM according to the Workshop Manual (Section 05-17 TCM REMOVAL/INSTALLATION).
9. Reconnect the negative battery cable.
10. Road test the vehicle and allow the transaxle to shift through all gears up and down with light throttle, then 1/2 throttle, then full throttle.
11. Bring the vehicle to a stop.
12. Place the gear selector in the "3" position and confirm a 2nd gear start and upshift to 3rd gear; stop again.
13. Place the gear selector in "2" position and confirm that 2nd gear is held and no upshift occurs.
14. Verify the repair by repeating Step 10, five to six additional times.
15. Reset the customer's radio station pre-sets.
16. Return the vehicle to the customer.
PART(S) INFORMATION
WARRANTY INFORMATION
NOTE:
^ Repairs performed outside the 48 month/50,000 mile New Vehicle Limited Warranty will require DCSM or DSA authorization.
^ Additional diagnostic time cannot be claimed for this repair.
Disclaimer