Guides to original ECU files
How to find your ECU's numbers, how reads differ, what is inside a WinOLS map pack — written to help you pick the right file, without the sales talk.
What is an original ECU file, and why do tuners need the stock read?
The stock read is the factory software of one exact ECU version. Here is what is inside it, how it differs from a modified file, and why workshops look for it before anything else.
Read the guide How-to · 5 min readHow to find the HW and SW number of your ECU
The car tells you the ECU type; the numbers tell you the file. Where to find the hardware and software number on Bosch, Denso, Continental/Siemens and Delphi units, and how to search with them.
Read the guide How-to · 4 min readHow to check you have the right original before writing it
Writing the wrong software to an ECU can leave a vehicle that does not start. A short checklist for before you buy and before you write, using nothing more than WinOLS or a hex editor.
Read the guide Explained · 4 min readWhy ECU file sizes differ between tools and read methods
"My read is 2 MB, the original is 4 MB" is one of the most common questions. File size depends on what was read and how it was saved; here is what really tells you whether two files match.
Read the guide Explained · 4 min readECU read methods explained: OBD, bench and boot mode
OBD, bench or boot — the method decides which memory ends up in the file. What each one reads, what it needs, and why it matters when you compare your read with an original.
Read the guide ECU families · 4 min readBosch EDC17 explained: variants, processors and finding the right file
EDC17 is the diesel ECU family behind a huge share of common-rail engines from the late 2000s on. What the name and variant codes mean, what is inside, and how to find the original for yours.
Read the guide ECU families · 4 min readToyota and Lexus Denso ECU numbers explained: 89661, 89663 and calibration IDs
Toyota part numbers look cryptic until you know the pattern. What 89661 and 89663 numbers are, why the calibration ID matters more than the label, and how to find the right Denso original.
Read the guide WinOLS · 5 min readWhat a WinOLS map pack is, and how to import a CSV map pack
A map pack names and describes the maps in one exact software version — it does not change a single value. What is in one, how it differs from a damos, and the WinOLS workflow for importing it.
Read the guide WinOLS · 5 min readHow map axes and factors work in a WinOLS map pack
An ECU stores plain integers; a map definition turns them into rpm, bar and Nm. How factors, data organisation, byte order and axes work — and how to see at a glance whether a map reads right.
Read the guide Reference · 6 min readECU file and WinOLS glossary: the terms explained
A2L, CVN, data organisation, count word, boot mode… Short, plain definitions of the terms you meet around ECU files, reading tools and WinOLS map packs.
Read the guideHave your HW or SW number?
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