Engine Controls - MIL ON/DTC's P0171/P0441/P0455
T-SB-0001-09January 6, 2009
M.I.L. "ON" DTC P0171, P0441, and/or P0455
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
Introduction
Some 2008 model year Corolla and Matrix vehicles equipped with a 1ZZ-FE engine may exhibit a M.I.L. "ON" condition with one or more of the Diagnostic Trouble Codes (DTCs) P0171 P0441 or P0455 stored in the Engine Control Module or ECM (SAE term: Powertrain Control Module/PCM).
Please use the following procedure to repair the vehicle.
Warranty Information
APPLICABLE WARRANTY
^ This repair is covered under the Toyota 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.
^ Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Parts Information
Required Tools & Equipment
^ Additional TIS Techstream units may be ordered by calling Approved Dealer Equipment (ADE).
Additional SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.
Inspection Procedure
Some 2008 model year Corolla and Matrix vehicles will set a M.I.L. "ON" DTC P0171, P0441, and/or P0455 as a result of the Purge VSV being continuously grounded by the ECM (PCM) instead of the normal duty cycled ground.
1. Confirm normal operation of the Purge VSV
Refer to the Technical Information System (TIS), 2008 model year Corolla/Matrix Repair Manual:
^ Corolla / Matrix: Engine/Hybrid System - Engine Control - "1ZZ-FE Engine Control System: SF1 System: EVAP System"
2. If the Purge VSV operates correctly per the Repair Manual diagnostics, replace the ECM (PCM).
3. If the Purge VSV does NOT operate correctly, follow the diagnostic procedures in the Repair Manual to repair.
Repair Procedure
1. Replace the ECM (PCM).
Refer to TIS, 2008 model year Corolla/Matrix Repair Manual:
^ Corolla / Matrix: Engine/Hybrid System - Engine Control - "1ZZ-FE Engine Control System: ECM: Removal"
^^ Corolla / Matrix: Engine/Hybrid System - Engine Control - "1ZZ-FE Engine Control System: ECM: Installation"
2. Register the VIN into the replacement ECM (PCM).
Refer to TIS, 2008 model year Corolla/Matrix Repair Manual:
^^ Corolla / Matrix: Engine/Hybrid System - Engine Control - "1ZZ-FE Engine Control System: SFI System: Registration"
3. Perform the Automatic EVAP System Check and verify that NO pending DTCs set.