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Canada - Engine Controls - Highway Speed Rocking Sensation






Bulletin
TSB2777

Issue Date
June 20, 2007

Market
Canada

Title
"ROCKING" FEELING AT HIGHWAY SPEED AROUND 112 KM/H

Component
ENGINE ELECTRICAL

Models
'06 - '07 Highlander HV

TSB REVISION NOTICE:
- August 21, 2007: The T1 code in the Warranty Information table has been updated.
Previous versions of TSB should be discarded.

INTRODUCTION:

Under certain circumstances, 2006 - 2007 model year Highlander HV owners may experience a back and forth "rocking" feeling while attempting to maintain the vehicle at a constant highway speed around 112 km/h. 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 65 km/h but NOT at highway speed around 112 km/h, perform TSB2656, "Rocking' Feeling Around 65 km/h (40 MPH)" instead of this bulletin. The calibration update in this bulletin addresses BOTH issues for vehicles exhibiting the "rocking" feeling around 65 km/h and 112 km/h.

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:






PARTS INFORMATION:

NOTE:
- The HV ECU should NOT be replaced as part of this Repair Procedure.
- Authorized Modification Labels may be ordered in packages of 25 from your facing PDC.






REQUIRED SSTs:

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 Midtronics Battery charger MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash programming the vehicle.

Follow the procedures outlined in TSB2758 "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 the Technical Information System (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 so 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): 2777

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 00451-00001-25.

6. Calibration update is complete.

NOTE:
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.

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.
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