July 11th, 2010 · No Comments
Some customers may complain of excessive sulfur dioxide odor on 2003–2004 model year Corolla vehicles under the following conditions:
– Stop and go driving.
– Heavy acceleration.
In order to reduce the sulfur dioxide odor, the Electronic Control Module (ECM) (SAE term: Powertrain Control Module/PCM) fuel cut control logic has been modified and a new catalyst is provided. Follow the repair procedure to reflash the ECM and replace the catalytic converter assembly.
ECM Reprogram Procedure
1. Check for the Authorized Modification Label affixed to the vehicle in the location shown in Figure 2 on page 5. If there is no label present, proceed to step 2.
2. Connect the Diagnostic Tester to the vehicle and select “CURRENT ECU CAL” from the “ECU REPROGRAM MAIN MENU.” To determine the vehicle’s current ECM calibration, see Figure 1 shown below.
3. Proceed to Flash Reprogram the ECM (PCM) by following the procedures in TSB No. SS002–01 titled “ECU Flash Reprogramming Process,” for 2001 and later applicable models.
NOTE: Errors during the flash reprogramming process can PERMANENTLY DAMAGE the vehicle’s ECM (PCM). In order to minimize this risk follow the steps below:
– Make sure that the current battery voltage is no less than 11.4 volts.
– Install a battery charger and set on a low setting to assure that the battery voltage DOES NOT FALL BELOW 11.4 VOLTS during the reprogramming.
– If battery’s state of charge is in question, test with SST No. 00002–MP815–T, “Midtronics Battery Tester.”
– Confirm that the engine hood is up, parking brake is set and all accessories are OFF (i.e., audio system, A/C, interior lights, headlights, etc).
– DO NOT perform the reprogramming process until the engine room temperature is 158_F (70_F) or less.
– Confirm cable connections between the vehicle and the Diagnostic Tester are secured.
– In case of Error Message “Cannot Go To Reprogram Mode,” refer to TSB No. SS004–01 “ECU Flash Reprogramming Error Message.”
– Do not interrupt the vehicle during the reprogramming process, keep all doors closed.
4. Select the proper ECM (PCM) calibration file for the model year vehicle and reprogram the ECM (PCM).
5. Start the engine and warm up the vehicle to normal operating temperatures before test–driving.
6. Test drive vehicle to confirm proper operation and to readjust the ECM (PCM) “Learned Values.” S Drive the vehicle using light to moderate acceleration in mostly stop and go type driving. Allow the vehicle to shift fully through all gears and at various shifter positions.
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Related Tags: applicable models, battery charger, battery voltage, cable connections, calibration, catalytic converter, catalytic converter assembly, control logic, corolla, electronic control, headlights, midtronics, powertrain, powertrain control module, question test, room temperature, sst, sulfur dioxide, toyota corolla, volts