Engine Controls - MIL ON/DTC P0456 Set

T-SB-0080-12

June 5, 2012

MIL "ON" DTC P0456

Service Category
Engine/Hybrid System

Section
Engine Control

Market
USA





Applicability

Introduction

Some 2005 - 2011 model year Tacoma vehicles with a 1GR-FE engine may exhibit a MIL "ON" condition with Diagnostic Trouble Code (DTC) P0456 - Evaporative Emission Control System Leak Detected (Very Small Leak) - when no leak is present. The Engine Control Module/ECM (SAE term:
Powertrain Control Module/PCM) logic has been modified to reduce the possibility of this condition occurring. Use the following repair procedure to address this condition.











Warranty Information











Parts Information








Calibration Information





Required Tools & Equipment

Repair Procedure

1. Using TIS Techstream, check for stored DTCs. If only DTC P0456 is present, proceed to step 2.

2. Clear DTCs.

3. Confirm that the fuel cap is tight. If it is loose, tighten the cap and finish the repair. If it is not loose, go to step 4.





4. 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 5.

5. 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 Service Bulletin T-SB-0064-10, "Techstream ECU Flash Reprogramming Procedure", and flash the ECM (PCM) with the NEW calibration file update.

6. 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 SB 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.

7. Using Techstream, run the Automatic EVAP system check.

System Select > Engine and ECT > Utility > EVAP System

^ PASS - Repair is complete.

^ FAIL - Refer to the Repair Manual for EVAP system diagnosis.

Refer to the Technical Information System (TIS), applicable model year Tacoma Repair Manual:

^ 2005Tacoma:

Engine/Hybrid System - Engine Control - "SFI System (1GR-FE): EVAP Inspection Procedure"

2006/2007/2008/2009/2010/2011(to 12/2010)/2011(from 12/2010) Tacoma:

Engine/Hybrid System - Engine Control - "1GR-FE Engine Control System: SFI System: EVAP System"

8. Test drive the vehicle to confirm proper vehicle operation.

© 2012 Toyota Motor Sales, USA