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

Bulletin
TSB2084

Issue Date
September16, 2004

Market
Canada



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

Component
ENGINE ELECTRICAL

Models
'04 Highlander (2AZ-FE)


Under certain driving conditions, some 2004 model year Highlander vehicles with 2AZ--FE engines may exhibit a M.I.L. "ON" condition with one or both of the following DTC's.
- 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 11.0a or later Diagnostic Tester software is required.

APPLICABLE VEHICLES:
- 2004 model year Highlander vehicles equipped with 2AZ-FE engines produced BEFORE the Production Change Effective VIN shown below.






PRODUCTION CHANGE INFORMATION:






WARRANTY INFORMATION:






PARTS INFORMATION:






REQUIRED SSTS:






CALIBRATION INFORMATION:

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:







1. Check for the Authorized Modification Label affixed to the vehicle in the location shown in Figure 1. Confirm if ECM (PCM) calibration has been updated. If 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 Calibration ID matches "Current Calibration ID" as shown, proceed with flash reprogramming.
- If Calibration ID matches "New Calibration ID" as shown, this vehicle has already been reprogrammed. Refer to Repair Manual or ETAS for diagnosis.

3. If ECU calibration ID is not the same as the "New Calibration ID" listed previously, proceed to Flash Reprogram ECM (PCM).

Flash Reprogram ECM (PCM)

1. Follow the procedures outlined in TSB No. 0941 "ECU Flash Reprogramming Process,"and flash the ECM (PCM) with new calibration file update.
2. 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 PDC P/N 00451--00001-25.
3. 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.