Tire Monitor System - 'Lost Communication With ECU' Mssg

L-SB-0025-09

March 12, 2009

Tire Pressure Monitoring System (TPMS) Tire Registration and "Lost Communication with ECU"

Service Category
Suspension

Section
Tire Pressure Monitoring

Market
USA





Applicability

Introduction

The purpose of this bulletin is to provide procedures on Tire Pressure Monitoring System sensor registration when "Lost Communication With ECU" appears on the Techstream display. This condition may occur when trying to register one or more sensors. Follow the procedures in this bulletin to properly register TPMS sensors.





Warranty Information








Required Tools & Equipment

Additional TIS Techstream units may be ordered by calling Approved Dealer Equipment (ADE).

NOTE
Additional SSTs may be ordered by calling 1-800-933-8335.

Repair Procedure

1. Connect TIS Techstream to the vehicle.

2. Turn the ignition switch to the "IG-ON" position.

3. Select the datalist for the Tire Pressure Monitoring System.

4. Check and set all tire pressures to specification with an accurate tire pressure gauge and compare the information to what is displayed on the datalist.

5. After checking the tire pressure, record the TPMS sensors ID numbers.

6. With the vehicle set to "IG-ON" mode, disconnect the TIS Techstream.





7. Using Jumper wire or equivalent, connect terminals TC and CG at the DL3 connector for at least 30 seconds. Do not cycle the ignition switch to "OFF" position during this step. (LX470 use TC and E1 at DLC1)

8. Once 30 seconds have passed, with the vehicle still in "IG-ON" mode, remove the jumper wire.

9. Connect TIS Techstream and begin the registration process.

NOTE
If "Lost Communication With ECU" appears during the registration process, then terminals TC and CG were not connected properly or the key was cycled during this process.

10. After registration has been performed leave TIS Techstream connected and confirm that the tire pressures are reading correctly and the threshold pressures show a difference of 5 to 7psi less than the inflation pressure. For vehicles with a TPMS reset switch press and hold the reset switch to begin the initialization process.

11. After tire pressures and thresholds pressures display on the datalist adjust all tire pressures in relation to the expected changes in ambient temperatures.

Please refer to TSIB L-SB-0154-08 for tire inflation pressure compensation and adjustment procedures.