Engine Controls - MIL ON/O2 Sensor DTC's Set
ENGINEEG008-05
Title:
M.I.L. "ON" DTC P0031, P0051, P2238, AND/OR P2241
Models:
'04 - '05 Solara (V6)
February 17, 2005
Introduction
Under certain driving conditions, some 2004 and 2005 model year Solara vehicles may exhibit a M.I.L. "ON" with at least one of the following DTCs:
^ P0031 (Oxygen Sensor Heater Control Circuit Low [Bank 1, Sensor 1])
^ P0051 (Oxygen Sensor Heater Control Circuit Low [Bank 2, Sensor 1])
^ P2238 (Oxygen Sensor Pumping Current Circuit Low (for A/F Sensor) [Bank 1, Sensor 1])
^ P2241 (Oxygen Sensor Pumping Current Circuit Low (for A/F Sensor) [Bank 2, 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.
NOTE:
^ Version 12.01a or later Diagnostic Tester software is required to perform this procedure.
^ Before proceeding, verify the ECM (PCM) calibration has NOT been updated by checking for the Authorized Modifications Label (shown in step 2 of the Repair Procedure).
Applicable Vehicles
^ 2004 model year Solara vehicles equipped with 3MZ-FE engine.
^ 2005 model year Solara vehicles equipped with 3MZ-FE engine produced BEFORE the Production Change Effective VINs shown below.
Production Change Information
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle's in-service date.
* Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Parts Information
Required SSTs
Calibration Identification Chart
NOTE:
^ Although the calibration description in the Calibration Update Wizard and on the Diagnostic Tester reads "04 Solara," these calibrations apply to 2004 and 2005 model year Solara vehicles produced before the Production Change Effective VINs shown in this TSB.
^ 2004 model year Solara vehicles, which have been flash reprogrammed using the procedures in this TSB, will contain upgraded 2005 model year OBD II logic. Refer to the 2005 model year Solara Repair Manual information on the Technical Information System (TIS) when checking Powertrain Diagnostic Trouble Codes (DTCs) on 2004 model year vehicles that have been reprogrammed.
Repair Procedure
1. Replace both Bank 1, Sensor 1 and Bank 2, Sensor 1 air fuel ratio sensors.
2. Check for the Authorized Modifications 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 3.
3. Connect the Diagnostic Tester to the vehicle and select CURRENT ECU CAL from the ECU REPROGRAM MAIN MENU. Determine the vehicle's current ECU calibration (see Figure 2).
- The sample screen prints seen below are the 12.01 a software version and may differ from subsequent software versions.
NOTE:
^ If Calibration ID matches "Previous Calibration ID" as shown in Calibration Identification Chart, proceed with flash reprogramming.
^ If Calibration ID matches "New Calibration ID" as shown in Calibration Identification Chart, this vehicle has already been programmed. Refer to TIS for diagnostic procedures applicable to any stored DTCs.
4. If 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 TSB No. SS002-01, "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. Follow the procedures outlined in TSB No. EG045-04, "Entering VIN During ECM (PCM) Replacement and/or DTC P0630," and write the VIN to the ECM (PCM).
5. 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-LBL.
6. The repair is complete. Test drive vehicle to confirm normal operation.