A/T - Slipping/DTC's P0734/P0735 or P0729

TSB: 05-016/06

2005 - 2006 MAZDA6 3.0L - TRANSAXLE SLIPPAGE - DTCS P0734 / P0735 OR P0729 MAY BE PRESENT

APPLICABLE MODEL(S)/VINS
2005 - 2006 Mazda6 3.0L vehicles produced before Feb. 24, 2006 equipped with a 6-Speed (AW6A-EL) Automatic Transaxle

DESCRIPTION

Some vehicles may experience transaxle slippage in the following manner:

^ Slippage (engine run up) or shock when depressing the accelerator fully (kick-down) from steady driving in 4th, 5th, or 6th gear.

^ Slippage (engine run up) or shock when accelerating and shifting up to 4th, 5th, or 6th gear.

NOTE:
^ After slippage occurs, DTCs P0734, P0735, or P0729 related to gear errors may be stored in memory as the transaxle is fixed in 5th gear emergency mode.

^ The symptom normally appears when the ATF is at normal operating temperature.

Due to excessive wear of the valve guide hole on the solenoid modulator valve No. 2 (which controls C2 clutch pressure), the C2 clutch pressure becomes too low. The length of modulator valve guide has been extended at mass-production.

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

REPAIR PROCEDURE

1. Verify customer concern.

^ If slippage (engine run up) or shock occurs when depressing the accelerator fully (kick-down) from steady driving in 4th, 5th, or 6th gear, proceed to Step 2.

^ If slippage (engine run up) or shock occurs when accelerating and shifting up to 4th, 5th, or 6th gear, proceed to Step 2.

^ If other symptoms are found, refer to the Workshop Manual (section 05-02) for further troubleshooting.

2. Inspect ATF condition.

^ If ATF does not smell burnt, and there are no (small or large) metal specks found in the ATF, proceed to Step 3.

^ If ATF does smell burnt, and there are (small or large) metal specks found in the ATF, proceed to Step 4.

3. Replace Control Valve Body according to Workshop Manual (section 05-17 CONTROL VALVE BODY REMOVAL/INSTALLATION [AW6A-EL]).

NOTE:
It is not necessary to drain the engine coolant, disconnect the lower radiator hose, or remove the front crossmember during control valve body replacement.

4. Replace automatic transaxle according to Workshop Manual (section 05-17 AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [AW6A-EL]).

5. Verify repair.





PART(S) INFORMATION





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.





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