• Power Supply Mode is used 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 TIS, Diagnostics – Tools & Equipment –
Battery Diagnostics.
Figure 7.

A

B

C

D

E

F

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

3. Click the appropriate calibration ID and reprogram the vehicle’s ECU with Techstream.
A. After reviewing the procedures outlined in the selected Service Bulletin, click the appropriate
calibration ID link by matching the vehicle’s current calibration ID to the Previous Calibration
ID in the Calibration Identification Chart.
NOTE
• Calibration files are embedded as live links in the Service Bulletin.
• Some vehicles require special preparation — please review the selected Service
Bulletin carefully.
Figure 8. New Image in Process

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

B. Click Open to load calibration file information.

Figure 9.

NOTE
Techstream pulls calibration files as needed
to ensure the latest calibration file is used.
Do NOT save calibrations locally on the
hard drive or other media.

NOTICE
Errors during the flash reprogramming process can permanently damage the vehicle ECU.
Minimize the risk by following the steps below.
• Battery voltage MUST NOT FALL BELOW 11.8 volts during reprogramming. Confirm
battery voltage is higher than 11.8 volts, but be sure voltage DOES NOT RISE ABOVE
16.0 volts during reprogramming.
• Turn OFF all vehicle accessories (e.g. audio system, A/C, interior lights, DRL, etc.). Do
NOT add to or significantly change the vehicle’s electrical load while reprogramming.
• Confirm the hood is open and ensure under hood temperature does NOT exceed 158◦F
(70◦C).
• Confirm cable connections between the vehicle and Techstream are secure.
• Do NOT disconnect or turn off Techstream or vehicle ignition during reprogramming.
• Set parking brake.
• Complete ALL flash calibration updates provided for each ECU.
• If the battery’s state of charge or capacity are in question, test with SST. No.
00002-V8150-KIT “Digital Battery Analyzer,” and follow Service Bulletin No. PG001-06,
“Battery Maintenance for In-Stock Vehicles & Pre-Delivery”, or the appropriate
“Maintenance for HV & Auxiliary Batteries” Service Bulletin.
• 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
TIS, Diagnostics – Tools & Equipment – Battery Diagnostics.

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

C. Click Next to start the calibration
update process.

Figure 10.

D. Confirm the following:
• PC is connected to VIM.
• VIM is connected to DLC3 connector.
• Ignition is ON and engine is OFF or “READY” OFF (hybrid vehicles).
Then click Next.
Figure 11. Using Techstream 2.0 or Techstream Lite

1

1

Select Correct Device Tool (“Mongoose MFC,” “MongoosePro MFC,” or “MongoosePro MFC2” [green])

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

E. Verify correct current calibration and new calibration information. Then click Next.
NOTE
• The total number of calibration IDs in the calibration file corresponds to the number of
reprogrammable processors in the ECU.
• Each calibration file may contain up to three separate calibrations.
• Figure 12 shows an example of the update procedure for a two-processor ECU.
Figure 12.

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Operation Procedure (Continued)

F. Turn ignition OFF. Then click Next.
Figure 13.

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

G. Confirm the following:
• Ignition is ON and engine is OFF or “READY” OFF (hybrid vehicles).
• Hood is open.
• All accessories are OFF.
• Battery voltage is above 11.8 volts.
NOTICE
Verify the vehicle is connected to a battery charger before continuing — If battery
voltage falls below 11.8 volts, ECU damage may occur.

Then click Start.
Figure 14.

NOTE
If key cycle is NOT done properly, reprogramming will stop at 10% and Cal 1 will fail to load.

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

H. Do NOT disturb the vehicle during flash reprogramming.
NOTE
• ECU flash reprogramming may take anywhere from 3 – 30 minutes per calibration file.
• Reprogramming time will vary depending on model and ECU communication
protocol. Vehicles using CAN communication protocol will reprogram much faster
(2 – 7 minutes).
Figure 15.

NOTE
• If vehicle requires only ONE calibration update, then proceed to step N in this bulletin.
• If vehicle requires a SECOND calibration update, then continue as follows:
• For serial communication vehicles, go to step I.
• For CAN communication vehicles, go to step K.

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

I. When Cal 1 has completed the update process, turn ignition OFF for a minimum of
10 seconds. Then click Next.
Figure 16.

1

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

J. Turn ignition to the ON position. Then click Start.
Figure 17.

NOTE
If key cycle is NOT done properly, reprogramming will stop at 10% and Cal 2 will fail to load.

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Operation Procedure (Continued)

K. Do NOT disturb the vehicle during flash reprogramming.
Figure 18.

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

L. Turn ignition OFF for a minimum of 10 seconds. Then click Next.
Figure 19.

1

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

M. Turn ignition to the ON position. Then click Next.
Figure 20.

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

N. Confirm all calibrations were updated as specified in the Service Bulletin. Then click Finish.
Figure 21.

NOTE
On some models, DTCs may set as a result of reprogramming. If DTCs are present, clear
codes and run the Health Check again. Troubleshoot any remaining Current, Pending, or
History codes. Permanent codes will not be cleared using Techstream. Permanent codes
do not illuminate the MIL and do not require troubleshooting. They will clear during normal
driving once the Universal Trip Drive Pattern is performed.

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Techstream ECU Flash Reprogramming Procedure

Operation Procedure (Continued)

4. Attach the Authorized Modifications Label.
A. Using a permanent marker or ball point pen, complete the Authorized Modifications Label
and attach to the vehicle. The Authorized Modifications Label is available through the MDC,
P/N 00451-00001-LBL.
Figure 22.

1
2

3

4

5

1

Replacement ECU Part Number

4

Date Completed

2

Calibration ID(s)

5

Service Bulletin or Campaign Number

3

Dealer Code

B. Attach the label under the hood in the location determined by the specific Service Bulletin
or Campaign.
NOTE
Wait 60 – 90 seconds for ink to set before handling.

© 2016 Toyota Motor Sales, USA