Engine Controls - Hesitation On Acceleration/DTC P2119
L-SB-0033-08 Rev1June 6, 2008
Hesitation on Acceleration
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
TSIB REVISION NOTICE
^ December 23, 2008 Rev1:
^ The Production Change Information table has been updated.
^ Part numbers have been updated in the Parts Information table.
^ Calibration IDs and ECM part numbers have been updated in the Calibration Information table.
Any previous printed versions of this service bulletin should be discarded.
Introduction
Some vehicles may exhibit a hesitation on acceleration and in some cases set Diagnostic Trouble Code (DTC) P2119 (Throttle Actuator Control Throttle Body Range/Performance). To enhance the smoothness of acceleration the Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) calibration has been revised. In some instances, the replacement of the cylinder heads may also be required. Use the following repair procedure to address the customer's concern.
Production Change Information
This TSIB applies to vehicles produced BEFORE the Production Change Effective VINs shown.
Warranty Information
APPLICABLE WARRANTY
^ Op Code EG8017: This repair is covered under the Lexus Federal Emission Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle's in-service date.
^ Op Code 110011: This repair is covered under the Lexus Powertrain Warranty. This warranty is in effect for 72 months or 70,000 miles, whichever occurs first, from the vehicle's 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 System, or by calling the MDC.
Calibration Information
Required Tools & Equipment
NOTE
Additional SSTs may be ordered by calling SPX/OTC.
Repair Procedure
1. Attach a Techstream unit and test drive the vehicle. Record all data duplicating the concern. Review the Knock Correct Learn Value, and the Ignition (IGN) Advance.
2. If the Knock Correct Learn Value drops from 17.0 CA to below 12.0 CA, and the IGN Advance goes to a negative degree value while duplicating the concern:
^ Vehicles produced BEFORE the Group 1 VIN break in the Production Change Information table go to step 3.
^ Vehicles produced BETWEEN the Group 1 and Group 2 VIN breaks in the Production Change Information table go to Repair Procedure A.
If the values are comparable to a known good vehicle, the concern may NOT be related to this TSIB diagnose the concern per the Technical Information System (TIS) depending upon symptoms.
3. Check the condition of the spark plugs.
^ If the spark plugs appear normal go to Repair Procedure A.
^ If one or more of the spark plugs has a brown residue on the porcelain and electrode go to Repair Procedure B.
Repair Procedure A
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.
If the calibration ID listed IS the latest ECM (PCM) calibration verify the spark plugs again for a brown residue. If no residue is found, diagnose per TIS depending upon symptoms.
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 Instruction Manual 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. Start the engine and warm it up to normal operating temperature before test driving.
5. Test drive the vehicle to confirm that the hesitation is NO longer present.
Repair Procedure B
1. Perform Repair Procedure A.
2. Replace the cylinder head assemblies for the left and right banks.
Refer to TIS, 2007 or 2008 model year LS 460 Repair Manual:
2007 LS 460:
^ Engine/Hybrid System Engine Mechanical "1UR-FSE Engine Mechanical: Cylinder Head Gasket (for Bank 1): Removal and (for Bank 2): Removal"
^ Engine/Hybrid System Engine Mechanical "1UR-FSE Engine Mechanical: Cylinder Head: Disassembly and Reassembly"
^ Engine/Hybrid System Engine Mechanical "1UR-FSE Engine Mechanical: Cylinder Head Gasket (for Bank 1): Installation and (for Bank 2): Installation"
2008 LS 460:
^ Engine/Hybrid System Engine Mechanical "1UR-FSE Engine Mechanical: Cylinder Head Gasket (for Bank 1): Removal and (for Bank 2): Removal"
^ Engine/Hybrid System Engine Mechanical "1UR-FSE Engine Mechanical: Cylinder Head: Disassembly and Reassembly"
^ Engine/Hybrid System Engine Mechanical "1UR-FSE Engine Mechanical: Cylinder Head Gasket (for Bank 1): Installation and (for Bank 2): Installation"
3. Reconnect the negative () battery terminal.
4. Re-initialize any affected power systems.
^ 2007 model year: Refer to TSIB No. PD007-07, "Power System Initialization During PDS".
^ 2008 model year: Refer to TSIB No. L-SB-004108, "Power System Initialization During PDS".
5. Test drive the vehicle to confirm that the hesitation is NO longer present.