Engine, A/T Controls - Hesitation On Acceleration/Harsh Shiftin: Overview

Classification: AT12-004B

Reference: ITB12-023B

Date: November 14, 2012

2011 G25; SHIFT RESPONSIVENESS ISSUES

This bulletin has been amended to change the first sentence of the IF YOU CONFIRM statement. Discard and previous versions.

APPLIED VEHICLE: 2011 G25 (V36)

APPLIED ENGINE: VQ25

APPLIED TRANSMISSION: 7 speed

IF YOU CONFIRM
That the customer has experienced or is experiencing:

^ Harsher than expected down shifts when coasting to a stop.

^ Hesitation/lag when accelerating after coasting.

^ Hesitation/lag or harsher than expected down shifts when coming to a stop and accelerating again (rolling stop).

^ Engine rev matching during moderate to heavy braking.

NOTE:
This is normal ASC (Adaptive Shift Control) operation that can be removed from normal drive mode, but will remain in sport mode.

ACTION

CAUTION:
There are two different possible ECM reprograms based on which generation of TCM is in the vehicle. TCM must be reprogrammed first.

^ Reprogram TCM first, then using new TCM part number select matching ECM reprogram using Consult III plus. See procedure.





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