Canada - Engine Control - MIL ON DTC P0172/P0175
Bulletin2400
Issue Date
May 10, 2007
Title
M.I.L. "ON" DTC P0172 & P0175 (ONLY)
Component
ENGINE ELECTRICAL
Models
'06 GS 300
INTRODUCTION:
Under certain driving conditions, some 2006 model year GS 300 vehicles may exhibit a M.I.L. "ON" with at least one 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 and PCV (Positive Crankcase Ventilation) valve have been modified to improved this condition.
NOTE:
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:
- 2006 model year GS 300 vehicles.
PARTS INFORMATION:
WARRANTY INFORMATION:
REQUIRED TOOLS & MATERIAL:
REQUIRED SSTs:
CALIBRATION IDENTIFICATION CHART:
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. Replace the PCV valve.
Refer to the Repair Manual within E-TAS / TIS library:
- Division: Lexus
- Model: GS300
- Year: 2006
- Service Category: Engine/Hybrid System
- Section: Emission Control
- Keyword: 3GR-FSE Emission Control: Ventilation Valve: Removal
- Keyword: 3GR-FSE Emission Control: Ventilation Valve: Installation
3. Flash Reprogram ECM (PCM).
NOTE:
The Midtronics Battery charger MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash programming the vehicle.
Follow the procedures outlined in TSB2401, "Techstream ECU Flash Reprogramming Procedure," and flash the ECM (PCM) with the NEW calibration file update.
4. Install the Authorized Modifications Label.
A. Using a permanent marker, enter the following information on the label:
- ECM (PCM) 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): TSB2400
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.
5. Change the engine oil and oil filter.
Refer to the Repair Manual within E-TAS / TIS library:
- Division: Lexus
- Model: GS300
- Year: 2006
- Service Category: Engine/Hybrid System
- Section: Lubrication
- Keyword: 3GR-FSE Lubrication: Oil Filter (for 4WD) / (for 2WD): Components
- Keyword: 3GR-FSE Lubrication: Oil Filter (for 4WD) / (for 2WD): Replacement
6. Start the engine and warm it up to normal operating temperature before test-driving.
7. The repair is complete. Test drive the vehicle to confirm normal 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.