Engine, A/T Controls - Hesitation On Acceleration/Harsh Shiftin: Overview
Classification: AT12-007AReference: ITB12-064A
Date: November 14, 2012
EX AND FX; SHIFT RESPONSIVENESS ISSUES
This bulletin has been amended to change the first sentence of the IF YOU CONFIRM statement. Discard and previous versions.
APPLIED VEHICLES: 2011 EX35 (J50)
2009 - 2011 FX35 (S51)
APPLIED ENGINE: VQ37VHR
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:
Engine rev matching is normal operation of the ASC (Adaptive Shift Control) in normal drive mode and sport mode. The ECM and TCM reprogramming in this bulletin will remove engine rev matching from ASC in normal drive mode, but it will remain as part of the ASC in sport mode.
ACTION:
1. Refer to step 6 in the SERVICE PROCEDURE to confirm this bulletin applies to the vehicle you are working on.
2. If this bulletin applies, reprogram the ECM and TCM.
CLAIMS INFORMATION
IMPORTANT:
The purpose of ACTION (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire SERVICE PROCEDURE as it contains information that is essential to successfully completing this repair.