# Why aren't pre-injection maps showing up as 16×16 in EDC17 CP44 — and how do I find them? **URL:** \ **Category:** Q&A Sessions\ **Tags:** diesel, winols, edc17, bosch, q-and-a, pre-injection, edc17cp44, 8-bit-maps, map-search\ **Created:** [May 9, 2026, 4:34am UTC](https://community.tunersguild.com/t/why-arent-pre-injection-maps-showing-up-as-16x16-in-edc17-cp44-and-how-do-i-find-them/133 "2026-05-09T04:34:37Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![ThomasPirowski](https://dub1.discourse-cdn.com/flex018/user_avatar/community.tunersguild.com/thomaspirowski/32/10_2.png) [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Post date:** [May 9, 2026, 4:34am UTC](https://community.tunersguild.com/t/why-arent-pre-injection-maps-showing-up-as-16x16-in-edc17-cp44-and-how-do-i-find-them/133/1 "2026-05-09T04:34:37Z")
If you searched an EDC17 CP44 file for pre-injection maps and the 16×16 shape from your training doesn’t appear, you’re not searching wrong. In this ECU pre-injection is stored as **8-bit values with 16-bit axes**. A default 16-bit scan can’t render them. Switch to 8-bit, set a reference line around 15, and walk the file from the start. There are few 8-bit maps in this ECU, so the candidates surface quickly. > 📹 **This is the text summary.** Members at our May 2026 Q&A live saw me find these maps on Marek’s actual binary in WinOLS — opening properties, switching bit-width, setting the help line, and walking through the candidates. For the full Bosch EDC17 context, see our [Bosch EDC17 tuning guide →](https://tunersguild.com/blog/bosch-edc17-tuning-guide/?utm_source=forum&utm_medium=kb&utm_campaign=qa-live-2026-05-05&utm_content=pillar). **[Register free for our next Open Q&A →](https://tunersguild.com/q-and-a/?utm_source=forum&utm_medium=kb&utm_campaign=qa-promo&utm_content=open-cta)** — live with me, agenda forming. * * * ## The question — from Q&A live 2026-05-05 **Marek** asked, sharing his binary file: > _“In the last meeting on Teams you talked about the maps Pre Injection, Main Injection, Post Injection — in that file it is clear as you showed it. But when I try to find those maps in the EDC17 CP44 file I am not sure if those maps are correct. Can they have slightly higher values, for example, or maps of a different size than 16×16?”_ The expectation that pre-injection is 16×16 is the source of the trouble. In EDC17 CP44 the bit-level shape is different. * * * ## Why 16-bit search doesn’t find them In EDC17 CP44, pre-injection quantity maps are stored as **8-bit values with 16-bit axes**. Scan the binary in 16-bit and the values just won’t read as anything logical: > _“If we do not see anything logical [in 16-bit view] — this is too small. Then we are just told that they are coded 8-bit.”_ (~40:08) This is not a bug. It’s how this ECU stores pre-injection. Switch the search to 8-bit and the maps surface. * * * ## The 8-bit walkthrough The workflow I ran on Marek’s file: ### 1. Go to the beginning of the file, switch to 8-bit view > _“Go to the beginning of the file, switch to 8-bit. The values should be about 14 to 20.”_ (~40:18) When stored 8-bit, pre-injection quantity values sit in the range 14–20. ### 2. Set a help line (reference line) around 15 In WinOLS: right-click → Properties → check the help line option → set to ~15. The reference line gives a visual anchor while scrolling through the 8-bit zone. ### 3. Walk the file — look for 8-bit values with 16-bit axes > _“The axes are always 16-bit and the values are 8-bit. There are not many maps with 8-bit values, so I simply go through the file and look for occurrence of the 8-bit maps with 16-bit axes.”_ (~40:39) This combination — 8-bit values, 16-bit axes — is uncommon in EDC17 CP44. Few other map types share that profile, so candidates are easy to spot. ### 4. Confirm with the conversion factor > _“And the conversion factor is 0.08 — so now you have milligram per cycle for the pre-injection.”_ (~41:14) In WinOLS Properties → Conversion, factor **0.08** converts the raw 8-bit value to **milligram per cycle**. A raw 15 becomes 1.2 mg/cyc — the unit and order of magnitude expected for pre-injection quantity. * * * ## Two groups, sometimes more — always check > _“There are two of them. Usually there are more than two — so you should always check if there are more. In this particular car we have two groups.”_ (~41:30) Marek’s binary had two pre-injection groups. Other applications of EDC17 CP44 can ship more. Always check the full 8-bit zone before deciding the search is done. * * * ## Tuning: +20% across all groups > _“I will do all of them by adding 20% to that 8-bit. Add 20% — that will be absolutely enough. Or you can try more, of course it will probably be even better.”_ (~41:50) Edit every group by the same percentage — that’s what _“do all of them”_ means in practice. +20% is the starting point Thomas demonstrated; he noted you can push further if needed. The same %-scaling principle applies on Delphi DCM 6.2 (see [KB-09 →](https://community.tunersguild.com/t/why-does-my-peugeot-hdi-with-dcm-6-2-ecu-have-100-duplicate-maps/98)) and on EDC17C46 driver-wish pairs (see [KB-08 →](https://community.tunersguild.com/t/why-wont-my-edc17c46-start-after-changing-the-driver-wish-map/82)). It’s not CP44-specific — it’s the same rule whenever a map family ships in multiple copies. * * * ## What this means for tuning Pre-injection maps in EDC17 CP44 aren’t hidden — they’re stored in a bit-width that 16-bit default search can’t render. Knowing the layout ( **8-bit values + 16-bit axes** , factor 0.08, range 14–20) is what makes the search work. The tuning rule on top is unchanged: identify all groups, scale the whole family by the same percentage. * * * ## Related on Tuners Guild - **The same +% rule on Delphi:** [KB-09 Why does my Peugeot HDI with DCM 6.2 ECU have 100+ duplicate maps?](https://community.tunersguild.com/t/why-does-my-peugeot-hdi-with-dcm-6-2-ecu-have-100-duplicate-maps/98) — synchronous percentage scaling on a different platform - **How pre-injection sits in the 4-tell method:** [KB-01 How do I distinguish pre-injection from post-injection maps in EDC17?](https://community.tunersguild.com/t/how-do-i-distinguish-pre-injection-from-post-injection-maps-in-edc17/119) — distinguishing pre vs post once you’ve found the maps - **Bosch EDC17 generic context:** [Bosch EDC17 tuning guide →](https://tunersguild.com/blog/bosch-edc17-tuning-guide/?utm_source=forum&utm_medium=kb&utm_campaign=qa-live-2026-05-05&utm_content=pillar) - **DCM 6.2a pre-injection community thread (different ECU, similar question):** [DCM6.2a pre-injection maps — C4 Grand Picasso FL](https://community.tunersguild.com/t/dcm6-2a-pre-injection-maps-c4-grand-picasso-fl/96) - **EGR off and the DPF stops regenerating:** [The +20% post-injection rule — full article on the blog](https://tunersguild.com/blog/egr-off-dpf-post-injection-rule/?utm_source=forum&utm_medium=kb&utm_campaign=blog-forum-crosslink&utm_content=kb-12) — the post-injection side of the same map family - **Full diesel calibration workflow:** [Chip Tuning Diesel — Practice course](https://tunersguild.com/courses/chip-tuning-diesel/?utm_source=forum&utm_medium=kb&utm_campaign=qa-live-2026-05-05) * * * ## Want the full EDC17 family workflow? EDC17 CP44 is one variant in a wide family — CP01, CP02, CP14, CP44, CP46, CP74 each ship slightly different bit-widths and map layouts for the injection chain. Our Chip Tuning Diesel Practice course covers the search workflow for the most common variants, including which maps are 16×16, which are 16×8, and which need the 8-bit trick from this post. **[See the Chip Tuning Diesel course →](https://tunersguild.com/pricing/?utm_source=forum&utm_medium=kb&utm_campaign=qa-live-2026-05-05)** * * * ## Your turn Found pre-injection maps in a **different EDC17 variant** (CP02, CP14, CP46, CP74) or a **non-Bosch diesel ECU** that needed an 8-bit (or other unusual bit-width) trick? Post your case: 1. ECU variant + car 2. Bit-width of values vs axes 3. Conversion factor that produced sane mg/cycle numbers 4. How many groups you found Cross-variant comparisons help everyone build a faster mental map of where bit-widths shift across the EDC17 family. * * *