Engine Controls - MIL ON/O2 Sensor DTC's Stored
ENGINEEG002-05
REVISED
Title:
M.I.L. "ON" DTC P0031, P0051, P2238, AND/OR P2241
Models:
'04 RX 330
February 9, 2005
TSIB REVISION NOTICE:
February 14, 2005: Part numbers for Air Fuel Ratio Sensors have been updated.
The previous TSB should be discarded.
Introduction
Under certain driving conditions, some 2004 model year RX 330 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.
^ A 2005 model year Brake Actuator Assembly must be installed on vehicles equipped with laser cruise control due to the use of 2005 model year software in the new ECM/PCM calibration.
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 1 of the Repair Procedure).
Applicable Vehicles
2004 model year RX 330 vehicles.
Warranty Information
Applicable Warranty*:
This repair is covered under the Lexus 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
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.
4. If ECU calibration ID is not the same as the "New Calibration ID" listed previously, proceed to Flash Reprogram ECM (PCM).
5. Flash Reprogram ECM (PCM)
A. Follow the procedures outlined in TSIB No. SS001-01, "ECU Flash Reprogramming Process," and flash the ECM (PCM) with the new calibration file update.
B. 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. Follow the procedures outlined in TSIB No. EG012-04, "Entering VIN During ECM (PCM) Replacement and/or DTC P0630," and write the VIN to the ECM (PCM).
7. For vehicles NOT equipped with laser cruise control, the repair is complete. Test drive vehicle to confirm normal operation.
8. For vehicles equipped with laser cruise control, a new Brake Actuator Assembly (with VSC ECU) must be installed at the time of recalibration. If vehicle is equipped with laser cruise control, use the Parts Information table on page 2 to order the correct part (2WD or 4WD) and follow the instructions listed on TIS: 2004 model year RX 330 Repair Manual: Brake: ABS & Traction Actuator Assy: Replacement to replace the Brake Actuator Assembly (with VSC ECU).
9. Follow the procedures outlined in TSIB No. BR001-04, "Zero Point Calibration," to calibrate the sensors affected by the Brake Actuator Assembly replacement.
10. Test drive to confirm normal vehicle and laser cruise control operation.