This document summarizes 16 design limitations of the Toyota Techstream diagnostic tool. The limitations include issues like registration security warnings, misleading diagnostic trouble code descriptions, monitor test failures, confusing PID displays, and communication errors when the laptop is moved or vibrated. Workarounds are provided for some of the limitations, such as ignoring security warnings or upgrading firmware. The document also provides links to additional information on troubleshooting oxygen sensor issues on certain Toyota models.

1. TOYOTO Techstream Design Limitations (SOLVED)
Here is the Toyota Techstream FAQ collections II , supported by a friend from a forum. Hopes it
helps you all.
Device to use:
Toyota Techstream from http://www.wobd2.com/wholesale/mini-vci-for-toyota-tis-
techstream-v7.00-744.html
Design Limitations
1. Registration Security Warning
2. DTC P1121 description misleading
3. Monitor for O2 sensor fails consistently
4. Confusing PIDs Displayed in TPMS ECU
5. Monitor Function Unavailable
6. Powertrain DTCs with FFD Have No Designation
7. Confusing Door Courtesy Light Values
8. Fatal Errors with Tire Pressure Monitor System
9. Cannot Connect Using Generic OBDII
10.HL AutoLeveling Active Test Inapplicability and Errors
11.EVAP System Check Failure
12.Single and Multi Freeze Frame Data Display is Erratic
13.Health Check DTC Clear All Failure
14.Unable to Perform VIN Write Unless Exiting the Application
15.Immobilizer/Smart Key Reset Abnormal Operation

2. 16.Vibration or Movement Causes Comm Errors
Design Limitations
Registration Security Warning
• Vehicle: N/A
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: Techstreams with Internet Explorer version 8 will
encounter a Security Warning pop-up during the Software
Registration process.
• Work Around: Click "No" to proceed normally, clicking "Yes"
will take longer to complete.

3. DTC P1121 description misleading
• Vehicle: 2004-2009 Toyota Prius
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: Due to the Prius now sharing an ECU with 5LE
equipped vehicles, the DTC now reads, "Throttle/Pedal
Position Sensor/Coolant Valve Position Sensor Circuit Stuck",
whereas it previously read, "Coolant Flow Control Valve
Position Sensor Circuit Stuck".
• Work Around: Refer to the TIS Repair Manual for the
relevant portion of the DTC.

4. Monitor for O2 sensor fails consistently
• Vehicle:
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: Monitor for O2 sensor consistently fails resulting in a
“complete/incomplete fail”. This is a result of an ECU bug
inherent to this vehicle (410-041). In most cases, the O2 Sensors are
functioning properly even if a “complete/incomplete fail” result
is seen. Verify O2 sensor operation by other processes to determine if
further diagnosis is required.

5. Confusing PIDs Displayed in TPMS ECU
• Vehicle: Vehicles NOT equipped with a factory optional 5th
TPMS sensor, i.e. some 2013 RAV4s and 2014 Highlanders.
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: PIDs indicating the presence of a 5th TPMS
sensor are displayed in the Data List and Health Check results
on vehicles allegedly not equipped with a 5th sensor. These
vehicles may come equipped with an optional 5th sensor, and
this can be physically verified by inspecting the spare tire.

6. Monitor Function Unavailable
• Vehicle: 2013 FR-S
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIM)
• Description: Function not available for this vehicle. The
button is grayed out (810-007).

7. Powertrain DTCs with FFD Have No Designation
• Vehicle: All
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: When viewing Trouble Codes or saved Health
Check data, Powertrain DTCs with FFD may have no
designation as to what type of FFD is saved.

8. Confusing Door Courtesy Light Values
• Vehicle: 2008-2011 Sienna
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: Parameters “FR and FL Door Courtesy”
in the Main Body ECU Datalist will display an “ON”
value when those doors are closed. Siennas with a L/O date of
November 2011 (2012MY) and forward will display values
logically; consistent with the rear doors.

9. Fatal Errors with Tire Pressure Monitor System
• Vehicle: 2012 Camry, 2013 GS350, and possibly other
vehicles
• Device(s): Techstream Lite (Mongoose VIM)
• Description: When using Techstream Lite with firmware
version v01.02.06 or lower, viewing the Datalist and using other
functions in the Tire Pressure Monitor System ECU will cause
fatal errors.
• Work Around: If you are using firmware v01.02.06 or lower,
upgrade your firmware to v01.02.07 (choose either 32-bit or 64-
bit OS, depending on your specs) or use Full Techstream.

10. Cannot Connect Using Generic OBDII
• Vehicle: All, including other makes/brands of vehicle
• Device(s): Techstream Lite (Mongoose and/or Mongoose Pro
VIMs)
• Description: When using a Mongoose VIM to connect
Techstream to a vehicle via Generic OBDII, the result is an
error window that displays "Cannot establish communication
with the ECU."
HL AutoLeveling Active Test Inapplicability and Errors
• Vehicle: 2010 Prius
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: Due to an ECU bug, inapplicable Active Tests
may display. Furthermore, the Drive Leveling Motor Active
Tests may fail to execute, resulting in an error.

11. EVAP System Check Failure
• Vehicle: 2006 LS430
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: Attempting to perform EVAP System Check will
result in error screen and the function will be inoperable.
Please refer to the repair manual for instructions on manually
inspecting the Evap System.

12. Single and Multi Freeze Frame Data Display is Erratic
• Vehicle(s): All
• Device(s): Techstream and Techstream Lite (Mongoose
and/or Mongoose Pro VIMs)
• Description: Given the same DTC and same
year/make/model vehicle, FFD display can be very erratic,
sometimes displayed as Single Frame and sometimes as Multi
Frame.
• Status: Under investigation. If you encounter this issue,
please press the F12 key to create an Error Report.

14. Health Check DTC Clear All Failure
• Vehicle: 2009-2010 Corolla, xD
• Device(s): Techstream and Techstream Lite (Mongoose VIM)
• Description: When using the Clear All DTC function from the
Health Check Screen, with IG ON and engine not running, the
progress indicator will loop continuously until the DTCs clear
(after 5 or 6 minutes). This also occurs when clearing DTCs of
the EMPS System. This issue can be avoided by having the
engine running while clearing DTCs.
Unable to Perform VIN Write Unless Exiting the
Application
• Vehicle: 04MY Vehicles reprogrammed with a 05MY
Calibration
• Device(s): Techstream and Techstream Lite (Mongoose VIM)
• Description: Unable to perform VIN Write on a 04MY Vehicle,
after reprogramming the Engine and ECT ECU with a 05MY
Calibration file. Since it is very difficult for the software to
identify a 04 Vehicle after updating with a '05 Calibration file,

15. you must exit out of the application and reconnect to utilize the
VIN write function.
Immobilizer/Smart Key Reset Abnormal Operation
• Vehicle: All
• Device(s): Techstream and Techstream Lite (Mongoose VIM)
• Description: When performing an Immobilizer or Smart Key
Reset, errors or abnormal operation may occur if Java software
is not installed, has become corrupt, or version is too old.
Installing the latest version of Java (v1.6 - Update 7, minimum)
from http://www.java.com will resolve this issue.
Vibration or Movement Causes Comm Errors
• Vehicle(s): All
• Device(s): Techstream (when using the VIM via USB - no
backpack) and Techstream Lite (Mongoose and/or Mongoose
Pro VIMs)
• Description: Certain laptops with HDD vibration protection
software experience intermittent communication loss when the
laptop is jerked or moved, which forces the user to restart
Techstream.

16. • Status: Issue is under investigation.
• Work Around: Though each PC is different, at your own risk,
the HDD vibration protection software may be adjusted to be
less sensitive, which may increase the risk of HDD damage
during abrupt movement or if the PC is dropped.
Ps. Toyota Techstream Open Issues (SOLVED)
http://blog.wobd2.com/2015/09/22/toyota-techstream-open-issues-
solved/
SO350 O2 sensor
http://www.wobd2.com/wholesale/ao2-ptb-1810-oxygen-sensor-o2-sensor.html