Canada - Engine Control - MIL ON DTC's P0031 P0051 P2238/P2241
BulletinTSB2078R
Issue Date
March 28, 2005
Title
M.I.L. "ON" DTC P0031, P0051, P2238 AND/OR P2241
Component
ENGINE ELECTRICAL
Models
'04 RX330
REVISION NOTICE:
- January 09, 2006: Part numbers for Air Fuel Ratio Sensors have been updated.
- May 19, 2005: Calibration Identification Chart updated.
Previous versions of this TSB should be discarded.
Under certain driving conditions, some 2004 model year RX330 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 RX330 vehicles.
WARRANTY INFORMATION:
PARTS INFORMATION:
REQUIRED SSTS:
CALIBRATION INFORMATION:
REPAIR PROCEDURE:
1. Replace both Bank 1, Sensor 1 and Bank 2, Sensor 1 air fuel ratio sensor.
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 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 are the 12.01a 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 TSB No. 0435, "ECU Flash Reprogramming Process," and flash the ECM (PCM) with 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 PDC, P/N 00451-00001-25.
6. Follow the procedures outlined in TSB No. 2046, "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, use the Parts Information table to order the correct part and follow the instructions listed on ETAS: 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 TSB No. 0665, "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.
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.