Canada - Engine Controls - Idle Hunting in Sub-Freezing Temp

Bulletin
TSB2754

Issue Date
April 25, 2007

Market
Canada

Title
"IDLE HUNTING" IN SUB-FREEZING AMBIENT AIR TEMPERATURES

Component
ENGINE ELECTRICAL

Models
'03 - '04 COROLLA & MATRIX (MTM)

INTRODUCTION:

Some 2003 - 2004 model year Corolla and Matrix vehicles may exhibit an "idle hunting" condition after the vehicle has been cold soaked in sub-freezing ambient air temperatures. During this condition the engine idle will "hunt" or fluctuate instead of maintaining a constant fast idle speed. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to correct this condition.

APPLICABLE VEHICLES:
- 2003 - 2004 model year Corolla and Matrix (2WD) vehicles equipped with manual transmission.






PARTS INFORMATION:






WARRANTY INFORMATION:






REQUIRED SSTs:






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 ECM (PCM) calibration has been updated. If the calibration listed is NOT the latest ECM (PCM) 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 calibrations (see Figure 2).
- The sample screen prints are the 14.0a software version and may differ from subsequent software versions.

NOTE:
- If the Calibration ID matches the "Previous Calibration ID" as shown in the Calibration Identification Chart in this TSB, proceed with flash reprogramming.
- If the Calibration ID matches the "New Calibration ID" as shown in the Calibration Identification Chart, this vehicle has already been programmed. Refer to E-TAS for diagnostic procedures 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 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 TSB2064, "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. 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): TSB2754

B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the PDC, P/N 00451-00001-25.

6. Start the engine and warm it up to normal operating temperature before test-driving.
7. Test drive vehicle to confirm proper vehicle operation.
8. Calibration update is complete.

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.