Engine, A/T Controls - A/T Temp Light When Towing In Cold Temps

T-SB-0224-12

November 13, 2012

A/T Oil Temperature Light ON When Towing in Sub-Freezing Temperatures (AB60E/F)

Service Category
Drivetrain

Section
Automatic Transmission/Transaxle

Market
USA





Applicability

Introduction

Some 2010 - 2011 model year Tundra vehicles equipped with the AB60E/F transmission and towing package may illuminate the A/T oil temperature warning light when towing in sub-freezing ambient temperatures. The Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) logic has been modified to address this condition.





Warranty Information





Parts Information





Calibration Information





Required Tools & Equipment

Repair Procedure

1. Confirm the condition.

2. Does the A/T oil temperature warning light illuminate when towing in sub-freezing ambient temperatures?

^ YES - Continue to step 3.

^ NO - This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.





3. Is the vehicle equipped with the towing package? (See Figure 1.)

HINT

To confirm if the vehicle is equipped with the towing package check for the A/F oil thermostat on the side of the transmission as shown in Figure 1.

^ YES - Continue to step 4.

^ NO - This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.





4. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 2. Confirm if the ECM (PCM) calibration has been updated. If the calibration ID listed is NOT the latest ECM (PCM) calibration - go to step 5.

5. Flash reprogram the ECM (PCM).

NOTE

^ 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 GR8 Instruction Manual located on the Technical Information System (TIS), Diagnostics - Battery

Follow the procedures outlined in Service Bulletin No.T-SB-0064-10, "Techstream ECU Flash Reprogramming Procedure", and flash the ECM (PCM) with the NEW calibration file update.

6. Start the engine and warm it up to normal operating temperature before test driving.

7. Reset the transmission memory then test drive the vehicle and confirm proper operation.

Refer to the Technical Information System (TIS) applicable model and model year Repair Manual:

^ 2010 Tundra:
Drivetrain - Automatic Transmission/Transaxle - Automatic Transmission: Automatic Transmission System: Initialization"

^ 2011 Tundra:
Drivetrain - Automatic Transmission/Transaxle - Automatic Transmission: Automatic Transmission System: Initialization"

8. 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 SB number]

B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 2. The Authorized Modifications Label is available through the MDC P/N 00451-00001-LBL.

© 2012 Toyota Motor Sales, USA