ECM - Poor Throttle Response/Downshift
ENGINEEG003-01
April 27, 2001
Title:
THROTTLE RESPONSE AND DOWNSHIFT QUALITY IMPROVEMENTS
Models:
'01 IS 300
Introduction
To improve throttle response and 5-2 downshift time, the Engine Control Module (ECM) calibration has been revised and the TRAC ECU has been changed.
Applicable Vehicles
^ 2001 model year IS 300 vehicles.
Production Change Information
ECM Calibration Number Information
Parts Information
NOTE:
Authorized Modifications Labels may be ordered in packages of 25 from the Materials Distribution Center (MDC) through TDN Dealer Support Materials System, or by calling the MDC at 1-800-622-2033.
Warranty Information
Applicable Warranty*:
This repair is covered under the Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle's in-service date.
* Warranty application is limited to correction of a problem based upon a customers specific complaint.
Repair Procedure
Flash Reprogram ECM:
Flash reprogram the Engine ECM (using calibration ID number 35301200) to improve throttle response under the following conditions.
^ From a stop (starting out), sudden accelerator pedal application to approximately 25 to 40 % opening.
^ From coasting at 15 to 25 MPH or at a steady cruise of 15 to 25 MPH, 50 to 70 % accelerator pedal application (to cause a 5-2 downshift).
Follow procedures outlined in TSIB No. SS001-01, ECU Flash Reprogramming Process, and flash reprogram the engine ECM with calibration file update 35301200.
After flash reprogramming the ECM, enter the required information on the Authorized Modifications Label and affix it to the vehicle at the location shown.
Replace TRAC ECU:
Replace the TRAC ECU to improve throttle response under the following conditions.
^ From a stop (starting out), sudden accelerator pedal application at or near Wide Open Throttle (WOT).
^ From low speed, at or near WOT accelerator pedal application while turning.
Remove lower finish panel and related HVAC duct work (below steering column) and access the TRAC ECU. Remove and replace the TRAC ECU.
NOTE:
Check "Service History" for the affected vehicle to assure that the TRAC ECU has not already been replaced.