Hybrid Controls - MIL ON/Multiple Hybrid Codes Set
ENGINEEG058-06
REVISED
Title:
MASTER, HYBRID, & M.I.L. "ON" DTC
P0A94, INFORMATION CODE 588 &
DTC P0A78, INFORMATION CODE
279 OR 306
Models:
'04 - '06 Prius
October 23, 2006
^ May 30, 2007: The TSB title has been changed ("DTC P0A78, Information Code 279 or 306" added). A note has been added to the Introduction. The Applicable Warranty section in Warranty Information has been updated.
Previous versions of this TSB should be discarded.
Introduction
Some 2004 - 2006 model year Prius vehicles may experience a M.I.L. "ON" condition with DTC P0A94, information code 588 (DC/DC Converter Performance). The Hybrid Vehicle Control ECU logic has been improved to address this condition.
NOTE:
If DTC P0A78 with information code 279 or 306 is also present, then ONLY apply this TSB - do NOT apply TSB No. EG025-05, "M.I.L. 'ON' DTC P0A60, P0A63, P0A72 P0A78, or POA7A".
Applicable Vehicles
^ 2004 - 2006 model year Prius vehicles produced BEFORE the Production Change Effective VINs shown below.
Production Change Information
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Hybrid Vehicle System Component Warranty. This warranty is in effect for 96 months or 100,000 miles, whichever occurs first, from the vehicle's in-service date.
For California specification vehicles sold, registered, and operated in California, Connecticut**, Maine, Massachusetts, New Hampshire**, New Jersey**, Rhode Island**, and Vermont, this repair is covered under the California Emission Warranty, which is in effect for 180 months or 150,000 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. Vehicles starting with 2005 model year.
Parts Information
Required SSTs
Repair Procedure
Remove and replace the HV ECU.
Refer to the Technical Information System (TIS):
^ 2004 or 2005 model year Prius Repair Manual: Engine/Hybrid System: Hybrid Control System: Hybrid Vehicle Control ECU: Replacement
^ 2006 model year Prius Repair Manual: Engine/Hybrid System: P112 Hybrid Vehicle Control: Hybrid Vehicle Control ECU: Removal & Installation.