Engine Controls - Intermittent No Start Condition
ENGINEEG011-07
REVISED
March27, 2007
^ July 10, 2007: The Production Change Information section has been added.
^ May 8, 2007: 2007 model year has been added to Applicable Vehicles. Part numbers and calibration data for 2007 model year have been added to the Parts Information table and the Calibration Identification Chart. The Diagnostic Tester software references have been updated to the latest version.
Previous versions of this TSB should be discarded.
Introduction
Some 2005 - 2007 model year Tacoma vehicles equipped with a 1GR-FE engine may exhibit an intermittent ~no start" condition. Improvements have been made to the Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) calibration to reduce the possibility of this condition occurring. Please use the following procedure to update the calibration.
Applicable Vehicles
^ 2005 - 2007 model year Tacoma vehicles equipped with 1GR-FE engine produced BEFORE the Production Change Effective VIN shown below.
Production Change Information
Warranty Information
This repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 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.
Required SSTs
Parts Information
Calibration Identification Chart
Inspection Procedure
1. If the vehicle is currently exhibiting a "no start" condition, refer to the Technical Information System (TIS) for the diagnostic procedure.
^ 2006 model year Tacoma Repair Manual, Engine/Hybrid System - Engine Control System - "1GR-FE Engine Control System: SF1 System: Basic Inspection".
NOTE:
When the intermittent "no start" condition is related to the ECM (PCM) issue, there will be NO injector pulse during cranking on the first starting attempt. After one ignition key cycle, the vehicle will start.
2. If the vehicle exhibits the above conditions, flash reprogram the ECM (PCM) following the repair procedure below.
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 listed is NOT the latest ECM (PCM) calibration go to step 2.
2. Connect the Diagnostic Tester to the vehicle and select CURRENT ECU CAL from the ECU REPROGRAM MAIN MENU. Determine the vehicle's current ECU calibrations (see Figure 2).
- The sample screen prints seen below are the 14.1 a software version and may differ from subsequent software versions.
3. If the ECU calibration ID is NOT the same as the New Calibration ID" listed previously, proceed to Flash Reprogram ECM (PCM).
4. Flash Reprogram ECM (PCM)
NOTE:
^ The GR8 Battery charger 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 charger please refer to the GR8 Instructions Manual, located on TIS, Diagnostics - Battery.
Follow the procedures outlined in TSB No. SS002-01, "ECU Flash Reprogramming Process, " and flash the ECM (PCM) with the NEW calibration file update.
NOTE:
If the "Check Engine" light is ON when the ignition is turned back ON to begin the reprogramming process, a scan tool cable problem exists. Refer to TSB No. SS004-01, "ECU Flash Reprogramming Error Message."
5. Start the engine and warm it up to normal operating temperature before test-driving.
6. Test-drive vehicle to confirm proper vehicle operation.
7. 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): EG011-07
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.
8. Calibration update is complete.