Engine Controls - MIL ON/DTC's P0172/P0175 Set
L-SB-0032-09March 26, 2009
M.I.L. "ON" DTC P0172 & P0175
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
Introduction
Under certain driving conditions some 2008 - 2009 model year IS 250 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.
Warranty Information
^ 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
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. SS002-007, "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 applicable model year IS 250 Repair Manual:
^ 2008 IS 250:
Engine/Hybrid System - Lubrication - "4GR-FSE Lubrication: Oil and Oil Filter (for 4WD) / (for 2WD): Replacement"
^ 2009 IS 250:
Engine/Hybrid System - Lubrication - "4GR-FSE Lubrication: Oil and Oil Filter (for 4WD) / (for 2WD): Replacement"
5. Test drive the vehicle to confirm proper vehicle operation.