Denso 89661, Nissan 23710, Isuzu 8980 and Mitsubishi 1860A: Reading Denso ECU Part Numbers

Nissan Navara, no start after the engine was swapped from a donor. ECU label: 23710-EB360, then E20KU4C_, then T2F2H61BA3. The donor’s box reads 23710-EB310 with E20KU4C_ and T2F2H61B13. Same hardware, different calibration, and the immo data inside doesn’t match the car. This is a typical Denso case: the box is fine, the numbers look nearly identical, and the difference that matters is hidden in the last block.

Denso numbers by car maker

Denso itself prints a 275xxx-xxxx reference on the case (275800-xxxx on many of the later boxes, with an MB-prefixed number on some older Mitsubishi-fitted units), but on the outside label you’ll usually be working from the car maker’s own number. The families you’ll see most:

• Toyota and Lexus: 89661-xxxxx. The five characters after the dash encode model and calibration; the Denso 275xxx number sits beside it. Two Corollas a year apart can differ in the last two characters only.
• Nissan and Infiniti: 23710-xxxxx. From the catalogue: 23710-EB360 and 23710-EB310 (Navara, YD25), 23710 EC01C and 23710 EB31B (Pathfinder), 23710 EB315 (Navara). Note that 23710 is Nissan’s part group for the engine ECU whoever built it; a Qashqai SID310 is listed as 23710HX43C 23701HX63D, and that one is Continental, not Denso.
• Isuzu: 8980xxxxxx, ten digits. D-Max, NPR and F-series use Transtron (an Isuzu and Fujitsu Ten joint venture) hardware, listed under the same numbering: 8980774127 with 98074887 (F-series), 8982241424 with 98224142 (D-Max), 8980412646 with 98081068 (NPR), and an older NPR as 8975261961 with 97527001. The eight-digit second number is the software.
• Mitsubishi: 1860Axxx, 1860 followed by a letter and three characters, next to the Denso E6T board code.
• Mazda, Suzuki, Subaru, Honda: their own numbers, with the Denso 275xxx reference underneath.

The calibration block: where Nissan hides the difference

On Nissan Denso labels, the third block (E20KU4C_, E30QUD_, E20MU4C_) is the hardware/software family and the fourth (T2F2H61BA3, T2E0P61B45, T2H1P61B25) is the calibration identifier. Two Navaras can share 23710-EB3xx and E20KU4C_ and still carry different T-codes. The T-code is what we match on, and it’s what you should read out with Consult or a KESS3/Autotuner ident before ordering, because the sticker is often faded or missing on a used box.

How to match a file, step by step

1. Photograph the label, then read the ECU ident through OBD. Compare the two; a reflashed box can hold newer software than the label says.
2. Search the car maker number (23710, 8980, 89661, 1860A) in the catalogue. Our product titles list it straight after the model.
3. If several results come back, match the second block: the Nissan T-code, the Isuzu eight-digit software, the Toyota calibration suffix.
4. Check what the file is: a plain DUMP is a stock read, an IMMO OFF DUMP has the immobiliser disabled. Both exist for most of the Navara and D-Max references above.
5. Read the ECU fully before writing anything. Denso boxes with SH7058/SH7059 processors need a bench read on most tools (KTAG, Flex, New Trasdata); later ones with RH850 need boot or a tool with a specific licence (Autotuner, and FoxFlash on some).

Why does my Toyota file not fit even though 89661 matches?

Because Toyota reuses the 89661 root across a model and only the suffix changes with market and gearbox. A manual and an automatic Hilux can differ in the last character. Send the full number, and the Denso 275xxx number as well if it’s readable.

Is a Denso immo off file enough on a Nissan?

For the engine ECU, yes: on the YD25 Navara and Pathfinder it removes the NATS check inside the ECU. The BCM will still complain about the key, but the engine runs. For a proper repair with original keys you’d pair the ECU to the BCM with Consult instead; see our NATS pairing guide.

What about Isuzu Transtron immo?

The D-Max immo lives in the Transtron ECU EEPROM. An IMMO OFF DUMP for 8982241424 or 8982485291 is written on the bench; some tools handle the later ones via OBD, but a bench read first is the safe route.

Files for these are under the Denso and Transtron model pages, and by brand under Nissan. If your number isn’t there, upload the read and a label photo via the request form and we’ll look for it.