Canada - Engine Control - MIL ON DTC's P0172/P0175

Bulletin
TSB2786

Issue Date
March 15, 2010

Title
M.I.L. "ON" DTC P0172 & P0175

Component
ENGINE ELECTRICAL

Models
'07 IS250

TSB SUPERSESSION NOTICE

The information contained in this TSB supersedes the information for 2007 model year IS 250 in TSB Nos. 2387 and 2396.
TSB Nos. 2387 and 2396 are now obsolete.

INTRODUCTION:

Under certain driving conditions, some 2007 model year IS250 vehicles with 4GR-FSE engines may exhibit a M.I.L. "ON" condition with one or both of the following Diagnostic Trouble Codes (DTCs):
- P0172 (System Too Rich [Bank 1])
- P0175 (System Too Rich [Bank 2])

The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to reduce the possibility of this condition occurring. Refer to the following repair procedure to address customer concerns.






APPLICABILITY:






WARRANTY INFORMATION:






PARTS INFORMATION:






CALIBRATION IDENTIFICATION CHART:






REQUIRED TOOLS & EQUIPMENT:

REPAIR PROCEDURE:






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 ID listed is NOT the latest ECM (PCM) calibration - go to step 2.
2. Flash Reprogram the ECM (PCM).

NOTE
- The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.
- For details on how to use the GR8 Battery Diagnostic Station, refer to the GR8 Battery Diagnostic Station Instruction Manual located on ETAS/TIS library > Tools > tools and equipment > GR8 Battery Diagnostic Station Instruction Manual.

Follow the procedures outlined in TSB No. 2401, "Techstream ECU Flash Reprogramming Procedure", and flash the ECM (PCM) with the NEW calibration file update.

3. Install the Authorized Modifications Label.
A. Using a permanent marker, enter the following information on the label:
- ECM part number [Refer to the Parts Information section for the CURRENT PART NUMBER]
- Calibration ID(s) [Refer to the Calibration Identification Chart for the NEW CALIBRATION ID]
- Dealer Code
- Repair Date
- Change Authority [This TSB number]

B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the PDC, P/N 00451-00001-25.

4. Change the engine oil and filter.

Refer to the Repair Manual within E-TAS / TIS library:
- Division: Lexus
- Model: IS250
- Year: 2007
- Service Category: Engine/Hybrid System
- Section: Lubrication
- Keyword: 4GR-FSE Lubrication: Oil Filter (for 4WD) / (for 2WD): Replacement

5. Test drive the vehicle to confirm proper vehicle 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.