Canada - Engine Controls - MIL ON/DTC P0420 Set

Bulletin
1301

Issue Date
January 8, 2004

Market
Canada

Title:
M.I.L. "ON" DTC P0420

Model
'01 PRIUS

TSB REVISION NOTICE:
- April 25, 2007: The Applicable Warranty box in the "Warranty Information" section has been updated, the ECM part number of the Parts Information table has been updated, and note has been added to the Parts Information table.
Previous versions of this TSB should be discarded.

INTRODUCTION:
Some 2001 model year Prius vehicles may experience a M.I.L. "ON" with DTC P0420 due to an Electronic Control Module (ECM) (SAE term: Powertrain Control Module/PCM) software logic error. The ECM logic has been modified to prevent the M.I.L. "ON" condition. Follow the repair procedures described to improve this condition.

APPLICABLE VEHICLES:
2001 model year Prius vehicles produced BEFORE the Production Change Effective VIN shown.







PRODUCTION CHANGE INFORMATION:







PARTS INFORMATION:







WARRANTY INFORMATION:







REQUIRED SSTS:

NOTE*:
- Additional Diagnostic Tester Kits, CAN Interface Modules, Program Cards, or other SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.

REPAIR PROCEDURE:
1. Follow the P0420 DTC diagnosis. Refer to the ETAS 2001 Prius Repair Manual: Section: Diagnostics; Subsection: Engine; Page: Circuit Inspection (P0420).
2. If B1S2 readings indicate a defective catalytic converter, replace the catalytic converter.
3. Verify engine ECM (PCM). If ECM part number is 89661-47030, replace the engine ECM (PCM).

NOTE:
- ECM (PCM) replacement applies to part number 89661-47030 ONLY.
- Maintain steady throttle during cruise while performing Confirmation Driving Pattern found in the Repair Manual.
- In some instances, both the catalytic converter and ECM (PCM) will need to be replaced.

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.