Canada - Engine Controls -MIL ON/DTC's P0031/P2238 Set

Bulletin
TSB2085R

Issue Date
September 28, 2004

Market
Canada



Title
M.I.L. "ON" DTC P0031 AND/OR P2238

Component
ENGINE ELECTRICAL

Models
'04 Camry

TSB REVISION NOTICE:
May 10, 2007: Applicable Warranty Information has been updated.
April 29, 2005: The Flash Reprogram Procedure has been updated to include instructions for removal of the 10A ECU-IG fuse.
Previous versions of this TSB should be discarded.

INTRODUCTION:

Under certain driving conditions, some 2004 model year Camry vehicles with 2AZ-FE engines may exhibit a M.I.L. "ON" condition with one or both of the following DTCs:
- P0031 - Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
- P2238 - Oxygen Sensor Pumping Current Circuit Low (For A/F Sensor) (Bank 1 Sensor 1)

The A/F sensor manufacturing process and the Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic have been modified to improve these conditions.

CAUTION:
Version 12.01a or later Diagnostic Tester software is required.

APPLICABLE VEHICLES:
- 2004 model year Camry vehicles.






WARRANTY INFORMATION:






PARTS INFORMATION:

NOTE:
- Authorized Modification Labels may be ordered in packages of 25 from your facing PDC.






REQUIRED SSTS:

NOTE:
Additional Diagnostic Tester Kits, CAN Interface Modules, Program Cards, or other SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.






CALIBRATION IDENTIFICATION CHART:

REPAIR PROCEDURE:

For DTC P0031 and/or P2238:

1. Replace Bank 1 Sensor 1 A/F Sensor.
2. Perform ECM (PCM) recalibration (see Calibration Procedure) with New Calibration ID as shown above in Calibration Information table.

CALIBRATION PROCEDURE:

Verify Vehicle Condition.







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's DLC3 connector and select CURRENT ECU CAL from the ECU REPROGRAM MAIN MENU. Determine the vehicle's current ECU calibration (see Figure 2).

NOTE:
If the Calibration ID matches the "Current 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 the 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).

FLASH REPROGRAM PROCEDURE:

Flash Reprogram ECM (PCM)







1. Remove the 10A ECU-IG fuse from the Instrument Panel Junction Block assembly. This action prevents possible activation of the ABS relay, resulting in ECM Reprogramming failure.

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

2. Follow the procedures outlined in TSB2064, "ECU Flash Reprogramming Process,"and flash the ECM (PCM) with new calibration file update.
3. Reinstall the 10A ECU-IG fuse in the Instrument Panel Junction Block assembly.
4. Enter the required information on the Authorized Modifications Label and affix it to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the MDC, P/N 00451-00001-25.
5. Calibration update is complete.