Engine Controls - Highway Speed Rocking Sensation
ENGINEEG030-07
REVISED
Title:
"ROCKING" FEELING AT HIGHWAY
SPEED (AROUND 70 MPH)
Models:
'06 - '07 Highlander HV
June 8, 2007
TSB REVISION NOTICE:
^ July 24, 2007: The T1 code in the Warranty Information table has been updated.
Previous versions of this TSB should be discarded.
Introduction
Under certain circumstances, 2006 - 2007 model year Highlander HV owners may experience a back and forth "rocking" feeling while maintaining the vehicle at a constant highway speed around 70 mph. The Hybrid Vehicle (HV) ECU logic has been updated to help improve this condition.
NOTE:
For 2006 model year vehicles where the owner is experiencing a back and forth "rocking" feeling at a constant speed around 40 mph but NOT at highway speed around 70 mph, perform TSB No. EG057-06, "'Rocking' Feeling Around 40 MPH" instead of this bulletin. The calibration update in this bulletin addresses BOTH issues for vehicles exhibiting the "rocking" feeling around 40 and 70 mph.
Applicable Vehicles
^ 2006 model year Highlander HV vehicles.
^ 2007 model year Highlander HV vehicles produced BEFORE the Production Change Effective VINs shown below.
Production Change Information
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Hybrid Vehicle Component Warranty.
This warranty is in effect for 96 months or 100,000 miles, whichever occurs first, from the vehicle's in-service date.
* Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Parts Information
^ The HV ECU should NOT be replaced as part of this repair procedure.
^ Authorized Modification Labels may be ordered in packages of 25 from the Materials Distribution Center (MDC) through the Dealer Daily Dealer Support Materials System, or by calling the MDC.
Required Tools & Equipment
^ Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE).
^ The Toyota Diagnostic Tester and CAN Interface Module may also be used to perform the service procedures listed in this bulletin.
^ The GR8 Battery Diagnostic Station (P/N 00002-MCGR8) supersedes the Automatic Trickle Charger (P/N 00002-YA122-01) and Fast Battery Chargers (Associated P/N ASE6OO3 and Christie P/N CAPPDQ). P/N 00002-YA122-01, ASE6OO3, and CAPPDQ are now obsolete.
Calibration ID Information
NOTE:
There are different calibration files for vehicles with and without transaxle oil coolers. In order to determine the configuration of your vehicle, shine a flashlight into the left front bumper cover vent. If the vehicle is equipped with a cooler, it will be easily visible.
Calibration Identification Chart
Repair Procedure
1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1. Confirm if the HV ECU and ECM (PCM) calibrations have been updated. If the calibration IDs are NOT the latest calibrations go to step 2.
2. Flash Reprogram the HV ECU and the ECM (PCM).
NOTE:
^ The GR8 Battery charger 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 GR8 Instruction Manual located on the Technical Information System (TIS), Diagnostics - Battery.
Follow the procedures outlined in TSB No. SSOO2-07, "Techstream ECU Flash Reprogramming Procedure, " and flash the ECM (PCM) with the NEW calibration file update.
NOTE:
^ Anytime the HV ECU is reprogrammed, the engine ECM (PCM) MUST also be reprogrammed, even if the engine ECM (PCM) has the "New Calibration ID".
^ If ONLY the engine ECM (PCM) Calibration ID matches the "Current Calibration ID" shown in the Calibration Identification Chart in this TSB, proceed with flash reprogramming.
^ If BOTH the engine ECM (PCM) and HV ECU Calibration IDs match the "New" calibration IDs shown in the Calibration Identification Chart, this vehicle has already been reprogrammed. Refer to TIS for diagnostic procedures applicable to any stored DTCs.
3. Start the engine and warm it up to normal operating temperature before test-driving.
4. Test-drive the vehicle to confirm proper vehicle operation (and proper laser cruise control operation, if equipped).
5. Install the Authorized Modifications Label.
A. Using a permanent marker, enter the following information on the label:
^ ECM (PCM) 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): EG030-07
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.
6. Calibration update is complete.
The effect of the NEW calibration may become more apparent after several days of driving as the ECM (PCM) "learned values" are re-established from the customer's driving.