Canada - Engine Controls - Engine Overheating at Highway Speeds

Bulletin
2548

Issue Date
July 13, 2006

Market
Canada

Title:
3MZ-FE ENGINE OVERHEATING

Component
ENGINE MECHANICAL

Models
'04 - '06 Solara

INTRODUCTION:
If the shifter is accidentally placed in the "S" position (manual shift mode) and driven at freeway speeds for extended periods of time in 3rd gear under certain atmospheric conditions, the engine can overheat causing damage to the engine and transmission. A revised ECM (SAE term: Powertrain Control Module/PCM) calibration has been developed to automatically upshift the transmission to 4th gear in "S" mode to prevent overheating from occurring.

APPLICABLE VEHICLES:
- 2004 - 2006 model year Solara vehicles equipped with the V6 engine and produced BEFORE the Production Change Effective VIN shown below.







PRODUCTION CHANGE INFORMATION:







WARRANTY INFORMATION:







PARTS INFORMATION:







REQUIRED SSTs:







CALIBRATION IDENTIFICATION CHART:

REPAIR PROCEDURE:
1. If the vehicle has been operated under overheat conditions, repair all mechanical components damaged due to engine and transmission overheating.







2. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1.
Confirm if ECM (PCM) calibration has been updated. If NOT the latest ECM (PCM) calibration - go to step 3.







3. 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 seen are the 13.3a software version and may differ from subsequent software versions

NOTE:
- If Calibration ID matches "Previous Calibration ID" as shown in Calibration Identification Chart, proceed with flash reprogramming.
- If Calibration ID matches "New Calibration ID" as shown in Calibration Identification Chart, this vehicle has already been programmed.

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

FLASH REPROGRAM PROCEDURE:

Flash Reprogram ECM (PCM)
1. Remove the 10A ECU-IG fuse from the driver's side Junction Block assembly. This action prevents possible activation of the ABS relay, resulting in ECM Reprogramming failure.







NOTE:
ECU damage may occur if the 10A fuse is NOT removed.

2. Follow the procedures outlined in Toyota TSB No. 0941, "ECU Flash Reprogramming Process," and flash the ECM (PCM) with new calibration file update.
3. Reinstall the 10A ECU-IG fuse in the driver's side Junction Block assembly.
4. Follow the procedures outlined in TSB No. 2133, "Entering VIN During ECM (PCM) Replacement and/or DTC P0630," and write the VIN to the ECM (PCM).
5. Start the engine and warm it up to normal operating temperature before test-driving.
6. Test drive vehicle to confirm proper vehicle operation.
7. Enter the required information on the Authorized Modifications Label and affix it to the vehicle the location shown in Figure 1. The Authorized Modifications Label is available through the PDC, P/N 00451-00001-25
8. Calibration update is complete.