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Canada - Engine Controls - Rocking Feeling at 40 MPH






Bulletin
TSB2656R

Issue Date
October 23, 2006

Market
Canada

Title
"ROCKING" FEELING AROUND 65 KM/H (40 MPH)

Component
ENGINE ELECTRICAL

Models
'06 Highlander HV

TSB REVISION NOTICE:
- August 21, 2007: The T1 code in the Warranty Information table has been updated.
- December 18, 2006: Part numbers for the HV ECU have been updated in the Parts Information table. The Calibration IDs in Figure 2 have been updated. The Note below Figure 2 has been updated.
Previous versions of TSB should be discarded.

INTRODUCTION:

Under certain circumstances, 2006 model year Highlander HV owners may experience a back and forth "rocking" feeling while attempting to maintain the vehicle at a constant speed around 65 kph (40 mph). The Hybrid Vehicle (HV) ECU logic has been updated to help improve this condition.

APPLICABLE VEHICLES:
- 2006 model year Highlander HV vehicles produced BEFORE the Production Change Effective VINs shown below.






PRODUCTION CHANGE INFORMATION:






WARRANTY INFORMATION:






PARTS INFORMATION:






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). If NOT the latest Calibration - go to step 2.







2. Connect the Diagnostic Tester to the vehicle and select CURRENT ECU CAL from the ECU REPROGRAM MAIN MENU. Determine the vehicle's current ECU calibration (see Figure 2).
- The sample screen prints are the 13.4a software version and may differ from subsequent software versions

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 "Previous Calibration ID" as shown in the Calibration Identification Chart in the TSB, proceed with flash reprogramming.
- If BOTH the engine ECM (PCM) and HV ECU Calibration ID matches the "New Calibration ID" as shown in the Calibration Identification Chart, this vehicle has already been programmed. Refer to ETAS for diagnostic procedure applicable to any stored DTCs.

3. If the ECU calibration ID is NOT the same as the "New Calibration ID" listed previously, proceed to Flash Reprogram ECM (PCM).
4. Flash Reprogram HV ECM (PCM).

NOTE:
A battery charger MUST be connected to the battery and set at a medium charge setting during the Flash Reprogram procedure in order to maintain battery voltage above 11.4 volts and prevent damage to the ECM (PCM).

Follow the procedures outlined in TSB0941, "ECU Flash Reprogramming Process," and flash the ECM (PCM) with the NEW calibration file update.

NOTE:
If the "Check Engine" light is ON when the ignition is turned back on to begin the reprogramming process, a scan tool cable problem exists, Refer to TSB0959, "ECU Flash Reprogramming Error Message."

5. Start the engine and warm it up to normal operating temperature before test--driving.
6. Test--drive vehicle to confirm proper vehicle operation and to complete the ECM learning process.
7. Enter the required information on the Authorized Modification Label and affix it to the vehicle at the location shown in Figure 1. The Authorized Modification Label is available through your facing PDC, P/N 00451-00001-LBL.
8. Calibration update is complete.

NOTE:
- Select premium unleaded gasoline with an Octane Rating of 91 or higher for optimum engine performance.
- 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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