Engine Controls - MIL ON/DTC's P0175/P0172 Set
L-SB-0041-09April 20, 2009
M.I.L. "ON" DTC P0172 & P0175
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
The information contained in this TSIB supersedes the information for 2007 model year IS 250 in TSIB Nos. EGOO2-07 and EGOO6-07.
Introduction
Under certain driving conditions some 2007 model year IS 250 vehicles with 4GR-FSE engines may exhibit a M.l.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.
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 vehicles in-service date.
^ Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Parts Information
NOTE
^ The ECM (PCM) should NOT be replaced as part of the repair procedure.
^ Authorized Modification Labels may be ordered in packages of 25 from the Materials Distribution Center (MDC) through Dealer Daily - Dealer Support Materials Orders.
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).
^ 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 located on the Technical Information System (TIS), Diagnostics - Battery
Follow the procedures outlined in TSIB No. SS002-07, "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 TSIB 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 MDC P/N 00451-00001-LBL.
4. Change the engine oil and filter.
Refer to TIS 2007 model year IS 250 Repair Manual:
Engine/Hybrid System - Lubrication - "4GR-FSE Lubrication: Oil Filter (for 4WD) / (for 2WD) Replacement"
5. Test drive the vehicle to confirm proper vehicle operation.