Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Manual Determination
If the EPROM is damaged then the "Basic part number" and "Programmed part number" indicated on the label of the control module that is located on the cover of the module must be entered "manually" via the touch screen on the tester so that the replacement part numbers can be determined.
This procedure is followed if "NO" is selected for the answer to the question "Is old EPROM still installed?"
During a manual determination you will need to:
- Enter the part number for a basic (programmable) control module.
- Enter the VIN number of the vehicle.
- Enter the part number of a programmed control module
Once the correct numbers are entered, the tester searches a "master list" for the proper replacement part number and will display either that part number or the message "no substitute found."
Regardless of which process is used if the replacement part does not match the part number displayed and "expected" by the program on the tester, programming will not occur. You need to obtain the proper replacement part.
At no time during the determination or programming process should you turn off the ignition, disconnect the control module or tester/interface.
Once the EPROM is programmed by way of the "Automatic" or "Manual" determination process it contains the operating program for the engine and the associated operational data or characteristic maps. In the event a basic replacement control module is installed, the EPROM installed in the control module will be programmed in the same manner.
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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.