Hybrid Cooling System - DTC P1121 Set/MIL ON
ENGINEEG024-05
REVISED
Title:
M.I.L. "ON" DTC P1121
Models:
'04 - '06 Prius
May 19, 2005
TSB REVISION NOTICE:
^ November 3, 2006: 2006 model year has been added to Applicable Vehicles.
The VINs in Production Change Information have been updated. The TIS references have been updated.
^ May 8, 2006: The Parts Identification section has been removed - All parts (P/N 16670-21010) are now countermeasure parts. Previous versions of this TSB should be discarded.
Introduction
Some customers with 2004 - 2006 model year Prius vehicles may experience a M.I.L. "ON" condition with DTC P1121, Coolant Flow Control Valve Position Sensor Stuck.
The coolant flow control valve has been improved to prevent this condition.
Applicable Vehicles
^ All 2004 - 2005 model year Prius vehicles.
^ 2006 model year Prius vehicles produced BEFORE the Production Change Effective VINs shown below.
Production Change Information
Parts Information
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Comprehensive Warranty. This warranty is in effect for 36 months or 36,000 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 SSTs
Repair Procedure
1. Remove engine under cover LH.
2. Drain engine coolant per instructions found on the Technical Information System (TIS), 2004 or 2005 model year Prius Repair Manual, Engine/Hybrid System - Cooling - "1NZ-FXE: Engine Coolant: Replacement".
3. Mark upper coolant hose (hose to heater core). Take note on original location of all coolant hoses.
NOTE:
Installation of the coolant hoses in the wrong location may result in cooling system malfunction.
4. Remove electrical connector on coolant flow control valve.
5. Remove all three coolant hoses on coolant flow control valve.
6. Remove coolant flow control valve from vehicle body.
7. Install replacement coolant flow control valve in reverse order of removal.
8. Install engine under cover LH.
9. Add engine coolant per instructions found on TIS, 2004 or 2005 model year Prius Repair Manual, Engine/Hybrid System - Cooling - "1NZ-FXE: Engine Coolant: Replacement".