A programming power supply holds the car's 12V system at a steady voltage while a module is being flashed or coded. During programming the ignition is on and many modules are awake, so a battery alone can sag, and a voltage drop can interrupt the download and leave a module unusable. You need one whenever you flash or code modules, or leave a car on for a long update.
Why does voltage matter during programming?
Programming a module can take from a few minutes to well over an hour. For that time the ignition is on, control modules are awake and the car is drawing current, but the engine is not running, so nothing is charging the battery. As the battery drains, voltage falls. Many modules and scan tools stop the job below a set voltage, and if the download is interrupted halfway, the module can be left with incomplete software and may need recovery or replacement.
How is it different from a battery charger?
A workshop charger is built to charge a battery, and its output follows the battery through charging stages. A programming power supply is built to hold a set voltage and supply current as the car's load changes, with or without a battery connected. For flashing, steady voltage matters more than charging speed.
When do you need one?
Use a stable supply whenever the job is long or the cost of failure is high:
- Module programming flashing new software into an ECU, TCU or body module.
- Online programming and J2534 jobs files download during the job and the car stays awake throughout.
- Coding and module replacement especially on cars that wake many modules at once.
- Long updates and tests any time the ignition must stay on for an extended period.
How do you connect and use it?
Follow the carmaker's and tool maker's procedure for the car in front of you. In general: connect the supply to the battery or the car's jump-start points before you start the job, switch off lights and other loads, close the doors, keep the scan tool's cable and Wi-Fi connection stable, and do not disconnect anything until the tool says the programming is finished. Voltage targets differ by carmaker, so use the figure in the procedure, not a rule of thumb.
What should you look for in one?
Check the output current is enough for a modern car with many modules awake, that voltage stays steady as the load changes, and that it can also help in the bay in other ways. The THINKCAR THINKPPS 150 that CSKA supplies is described as providing stable power for module programming, with fast charging for AGM, GEL and EFB batteries, battery activation and repair, a 400A jump start and exhibition mode.
Questions
Can I just leave a battery charger connected while programming?
It is better to use a supply made for programming. A charger is designed to charge a battery, not to hold a steady voltage as the car's load changes, so check what the carmaker and the tool maker require.
Do I need a power supply for a short coding job?
Short jobs carry less risk, but a low battery can still stop a job part-way. Many workshops connect a supply for every programming or coding job so they never have to wonder.
What happens if voltage drops during programming?
The tool may stop the job, or the download may be interrupted. Depending on the module, that can leave it without working software until it is recovered or replaced, which is why a stable supply is worth connecting first.
Talk to CSKA
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