M.I.L. "ON" DTC P0420 Models:
'02 - '04 Camry (2AZ-FE) (Non PZEV)
July 1, 2004
TSB REVISION NOTICE :
July 27, 2004: The OP Code in the Warranty Information table has been changed from Combo A to Combo B.
July 7, 2004: The Parts Information, Warranty Information, Applicable Vehicles and the Note in the Introduction have been changed.
All previous versions of this TSB should be discarded.
Some 2002 - 2004 model year Camry vehicles equipped with the 4 cylinder (2AZ-FE) engine may exhibit a M.I.L. ON" condition with Diagnostic Trouble Code (DTC) P0420 (Catalyst System Efficiency Below Threshold, Bank 1) in the Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM). The ECM (PCM) logic has been modified and a redesigned catalyst has been provided.
NOTE :The repair procedure in this TSB is similar to TSB No. EG013-04 "Excessive Sulfur Dioxide Odor." The recalibration of the ECM (PCM) should only be performed ONCE.
2002 - 2004 model year Camry vehicles equipped with the 2AZ-FE engine (non PZEV) and automatic transmission produced BEFORE the ProductionChange Effective VINs shown.
ECM Reprogram Procedure
1. Check for the Authorized Modification Label affixed to the vehicle in the location shown in Figure 2. 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 (PCM) calibration, see Figure 1.
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-L, "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°C) 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-O1 "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."
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.