Hybrid Controls - MIL ON/DTC's P0AC0/P0A1F/P0A7F/P0AFA
T-SB-0166-09May 28, 2009
M.I.L. "ON" DTC P0AC0, P0A1F, P0A7F, and/or P0AFA
Service Category
Engine/Hybrid System
Section
Hybrid/Battery Control System
Market
USA
Applicability
Introduction
Some vehicles may exhibit a M.I.L. "ON" condition with one or more of the following Diagnostic Trouble Codes (DTCs):
^ P0AC0 - Hybrid Battery Pack Current Sensor Circuit Range/Performance
^ P0A1F - Battery Energy Control Module
^ P0A7F - Hybrid Battery Pack Deterioration
^ P0AFA - Hybrid Battery System Voltage Low
Improvements have been made to the HV ECU and battery ECU hardware to correct these conditions.
Production Change Information
This TSB applies to vehicles produced BEFORE the Production Change Effective VINs shown.
Parts Information
Warranty Information
APPLICABLE WARRANTY
^ This repair is covered under the Toyota Hybrid Vehicle System 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 (starting with '05 MY), Maine, Massachusetts, New Hampshire (starting with '05 MY), New Jersey (starting with '05 MY), New York, Oregon (starting with '08 MY), Rhode Island (starting with '05 MY), and Vermont, this repair is covered under the California Emissions Warranty. This warranty 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.
Required Tools & Equipment
NOTE
Additional TIS Techstream units may be ordered by calling Approved Dealer Equipment (ADE).
Inspection Procedure
1. Using TIS Techstream check for Diagnostic Trouble Codes (DTCs).
2. Are only codes P3000 (Information Code 123) P0AC0, P0A1F, P0A7F or P0AFA present?
^ YES - Continue to step 3.
^ NO - Diagnose other DTC(s) first.
3. Review the Freeze Frame Data (FFD) for P3000 (Information Code 123) P0AC0, P0A1F, P0A7F or P0AFA DTC(s). Inspect the Battery State of Charge (Figure 1) and Battery Block Voltages 1-14 (Figure 2).
4. Is the Battery State of Charge 0.0% or do ALL Battery Blocks equal 0.00V?
^ YES - Proceed to step 5.
^ NO - This TSB does NOT apply.
For additional diagnostics refer to the Technical Information System (TIS) applicable model year Prius Repair Manual:
^ 2004 / 2005 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "Hybrid Control System: Diagnostic Trouble Code Chart"
^ 2006 / 2007 / 2008 / 2009 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "P112 Hybrid Vehicle Control: Hybrid Control System: Diagnostic Trouble Code Chart"
5. Clear the DTC(s) and road test the vehicle.
Do the DTC(s) reset?
^ YES - This TSB does NOT apply.
For additional diagnostics refer to TIS applicable model year Prius Repair Manual:
^ 2004 / 2005 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "Hybrid Control System: Diagnostic Trouble Code Chart"
^ 2006 / 2007 / 2008 / 2009 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "P112 Hybrid Vehicle Control: Hybrid Control System: Diagnostic Trouble Code Chart"
^ NO - Perform the Repair Procedure.
Repair Procedure
1. Replace the HV ECU.
For complete disassembly and reassembly procedures refer to TIS applicable model year Prius Repair Manual:
^ 2004 / 2005 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "Hybrid Vehicle Control ECU: Replacement"
^ 2006 / 2007 / 2008 / 2009 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "P112 Hybrid Vehicle Control: Hybrid Vehicle Control ECU: Removal"
^ 2006 / 2007 / 2008 / 2009 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "P112 Hybrid Vehicle Control: Hybrid Vehicle Control ECU: Installation"
2. Replace the battery ECU.
For complete disassembly and reassembly procedures refer to TIS applicable model year Prius Repair Manual:
^ 2004 / 2005 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "Battery ECU Assy: Replacement"
^ 2006 / 2007 / 2008 / 2009 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "P112 Hybrid Battery Control: Battery ECU: Removal"
^ 2006/ 2007 / 2008 / 2009 Prius:
Engine/Hybrid System - Hybrid/Battery Control System - "P112 Hybrid Battery Control: Battery ECU: Installation"