Engine Controls - MIL ON/DTC P0125 Stored in Memory
T-SB-0088-08June 6, 2008
M.I.L. "ON" DTC P0125
Service Category
Engine/Hybrid System
Section
Engine Control
Market
USA
Applicability
Introduction
Some customers may report a M.I.L. "ON" condition that occurs after operating the vehicle for extended times in "Ready ON" mode with the transaxle in the Park position.
The following Diagnostic Trouble Code (DTC) may be found: P0125 "1nsufficient Coolant Temperature for Closed Loop Fuel Control". The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to improve this condition. Use the following repair procedure for applicable vehicles.
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
Calibration Identification Chart
Required Tools & Equipment
Diagnostic Procedure
Since other factors can cause the DTC P0125 "Insufficient Coolant Temperature for Closed Loop Fuel Control" condition eliminate other possible causes prior to performing the detailed repair procedure that follows.
^ General trouble areas:
^ Engine thermostat
^ Coolant leaks
^ Improper engine coolant type or contamination
Refer to the Technical Information System (TIS):
2004 or 2005 model year Prius Repair Manual Engine/Hybrid System - Engine Control - "SFI System: P0125 Insufficient Coolant Temperature For Closed Loop Fuel Control"
2006 or 2007 model year Prius Repair Manual Engine/Hybrid System - Engine Control - "1NZ-FXE Engine Control System: SFI System: P0125 Insufficient Coolant Temperature For Closed Loop Fuel Control"
2. Connect TIS techstream to DLC3.
3. Place the car in the "IG-ON" mode (push the Power button twice when the car is OFF - Do NOT depress the brake pedal).
Repair Procedure
1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1. Confirm if the ECM (PCM) calibration has been updated. If the calibration ID listed is NOT the latest ECM (PCM) calibration - go to step 2.
2. Connect TIS techstream to DLC3.
3. Place the car in the "IG-ON" mode (push the Power button twice when the car is OFF - Do NOT depress the brake pedal).
4. Flash Reprogram the ECM (PCM).
^ The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.
^ For details on how to use the GR8 Battery Diagnostic Station, refer to the located on TIS, Diagnostics - Battery
Follow the procedures outlined in TSB No. SS002-07, "Techstream ECU Flash Reprogramming Procedure", and flash the ECM (PCM) with the NEW calibration file update.
5. Install the Authorized Modifications Label.
A. Using a permanent marker enter the following information on the label:
^ ECM part number [Refer to the Parts Information section for the CURRENT PART NUMBER]
^ Calibration ID(s) [Refer to the Calibration Identification Chart for the NEW CALIBRATION ID]
^ Dealer Code
^ Repair Date
^ Change Authority [This TSB number]
B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the MDC P/N 00451-00001-LBL.
6. Start the engine and warm it up to normal operating temperature before test driving.
7. Test drive the vehicle to confirm proper vehicle operation.
8. Calibration update is complete.