Pass-Thru programming allows the scan tool to remain connected to the terminal and to the vehicle throughout the programming process. The vehicle must be in close proximity to the terminal while using Pass-Thru.

Performing the Pass-Thru Procedure

IMPORTANT: The TIS supports service programming with the Tech 2 scan tool only.

Launch the TIS application at the terminal.
Select the Service Programming System.
Highlight the following information on the Select Diagnostic Tool and Programming Process screen:
- Select Diagnostic Tool-Select Pass-Thru
- Select Programming Process-Identify whether an existing module is being reprogrammed or a module is being replaced with a new one.
- Select ECU Location-Select vehicle
Select Next.
Complete all terminal-directed data on the Preparing for Communication/Determine Vehicle screen until Next is highlighted.

IMPORTANT: In order to reduce the potential for signal loss, the RS-232 cable should not be more than 25 feet long.

Select Next.
Follow the instructions on the Preparing for Communication screen.
Select Next.

IMPORTANT: The correct VIN must be entered if the vehicle identification number (VIN) does not appear correctly.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Pass-Thru Programming

Use the Manual With the Right Hardware

When to See a Mechanic

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