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03-04 Toyota Matrix (1ZZ-FE) M.I.L. On DTC P0420 Technical Service Bulletin

July 11th, 2010 · No Comments

Some 2003 – 2004 model year Matrix vehicles equipped with a 1ZZ–FE engine may exhibit a M.I.L. “ON” condition with Diagnostic Trouble Code P0420 (Catalyst System Efficiency Below Threshold) stored in the Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM). Follow the repair procedure to reflash the ECM (PCM) and replace the catalytic converter assembly.
NOTE: The repair procedure in this TSB is the same as TSB No. EG017–04 “Excessive Sulfur Dioxide Odor.” This repair should only be performed once.
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,
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.
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.”
- 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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