Engine Controls - Engine RPM Decrease Above 40 MPH
T-SB-0124-11September 6, 2011
Momentary RPM Decrease Above 40 MPH and/or Reduced Engine Braking
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
Introduction
Some 2011 Corolla or Matrix vehicles may exhibit one or both of the following conditions as a result of fuel cut logic:
^ Momentary engine RPM decrease (300 - 700 RPM) while cruising at speeds above 40 MPH.
^ A feeling of reduced or slightly delayed engine braking when releasing the accelerator pedal at highway speeds.
Follow the repair procedure in this bulletin to address this condition.
Warranty Information
Calibration Information
Parts Information
Required Tools & Equipment
Repair Procedure
1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1. Confirm if the ECM (PCM) calibration has been updated. If the calibration ID listed is NOT the latest ECM (PCM) calibration - go to step 2.
2. Flash reprogram the ECM (PCM).
NOTE
^ The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.
^ For details on how to use the GR8 Battery Diagnostic Station, refer to the located on the Technical Information System (TIS), Diagnostics - Tools & Equipment - Battery Diagnostics.
Follow the procedures outlined in TSB No. T-SB-0004-10, "Techstream ECU Flash Reprogramming Procedure" and flash the ECM (PCM) with the NEW calibration file update.
3. Install the Authorized Modifications Label.
A. Using a permanent marker enter the following information on the label:
^ ECM part number [Refer to the Parts Information section for the CURRENT PART NUMBER]
^ Calibration ID(s) [Refer to the Calibration Identification Chart for the NEW CALIBRATION ID]
^ Dealer Code
^ Repair Date
^ Change Authority [This TSB number]
B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the MDC P/N 00451-00001-LBL.
4. Test drive the vehicle to confirm proper vehicle operation.