Actia AS 19.300 LN, AS 19.300 ST, AS 26.300 FT, AS 26.300 LN, AS 26.300 SN 2008 Diagnostics Manual

If you’ve ever plugged a scan tool into a truck and spent twenty minutes scrolling through wrong menus, you know what I’m talking about. That’s time you don’t get back. This 121-page document from Actia is the factory applications list for the Multi-Diag system covering the Actia AS 19.300 LN, AS 19.300 ST, AS 26.300 FT, AS 26.300 LN, and AS 26.300 SN models built in 2008. It tells you exactly which electronic systems are reachable and what you can do to them. No guesswork.

What This Diagnostics Manual Actually Contains

This isn’t a repair manual with torque specs or wiring diagrams. It’s the table that tells your Multi-Diag tool which ECUs are on each truck and what functions the tool supports. For every model, you get system type (Brakes – Anti-lock Braking System, Engine – Electronic Diesel Control, Retarder), a system reference number (like 0100020676), and a matrix of available actions: Diagnosis (D), Measure Values (MV), Component Actuation (A), ECU Data (DE), Parameters (P), Calibration (C), and Reset (R). The 121 pages cover exactly this for the five models listed – and nothing more.

3 Models, 5 Configurations – One Reference

The AS 19.300 comes in LN and ST variants. The AS 26.300 comes in FT, LN, and SN. Each has its own set of system references. For example, the AS 26.300 LN brakes use reference 0100020674; the AS 19.300 ST brakes use 0100020679. You cannot swap these. The 2008 production year is locked in – this manual applies only to that year’s software and hardware. If you’re working on a 2009 truck, you need a different list.

Diagnostic Functions: Beyond Reading Codes

Look at the OCR excerpt: for the AS 19.300 LN brakes, every function box is checked – D, MV, A, DE, P, C, R. That means you can diagnose, measure live sensor data, actuate solenoids, read ECU identification, view and modify parameters, perform calibrations (e.g., after ABS sensor replacement), and reset fault memory. That’s the full suite. The Multi-Diag tool uses standard OBD protocols; you can read about On-board Diagnostics (OBD) to understand the underlying communication. But this document gives you the exact system reference to punch in – without it, you’re picking from a generic list that may or may not match.

OEM Data vs. Aftermarket Lists

I’ve seen aftermarket databases that claim to cover these Actia trucks but list the wrong system reference or miss the retarder entirely. That’s a waste of a service call. This is the original factory document from Actia, dated 2008. The system references like 0304160676 for the AS 19.300 LN engine EDC – that’s not something a third party guessed. It’s from the manufacturer. If you’re serious about diagnostics, you use OEM data. Period. For comparison, check out the Maxitpms TS601 Diagnostics Manual – OEM TPMS & OBDII Guide if you work on TPMS systems – same principle of factory data. If you need similar coverage for other brands, the Magneti Marelli LINEA Diagnostics Manual – Factory ECU & Sensor Guide covers a different line. And for heavy-duty multiplexing, the Launch HD_ASTRA, HD_BENZ, HD_BREMACH, HD_CUMMINS, HD_DAF 2010 Diagnostics Manual is another resource. But for these Actia trucks, this is the one.

Who Needs This 121-Page Document

DIYers who own a 2008 Actia truck and have access to a Multi-Diag tool – you need this. Fleet mechanics who maintain a mix of these models – you need this. Shop owners who want to stop wasting techs’ time scrolling through menus – you need this. The manual is 121 pages of pure reference data. No fluff. No theory. Just the system reference numbers and the function matrix. Keep it on your tablet in the bay. When a truck comes in with a retarder fault, you look up the model, find the retarder line, note the reference – 0600210676 for the AS 19.300 LN – and you’re in the right menu in seconds.

Does this manual include wiring diagrams?

No. This is an applications list only. No wiring or repair procedures.

Can I use this with any scan tool?

No. This document is specifically for the Actia Multi-Diag diagnostic tool. It lists the system references that the tool uses to identify and communicate with the ECUs. If you own a Multi-Diag and work on Actia trucks from 2008, you need this list to navigate the software. Without it, you’re scrolling blind. The list breaks down by model and system – for example, the AS 19.300 LN engine EDC has reference 0304160676. Punch that in and you get direct access to parameters, actuation, and resets. Third-party scanners have their own databases. This is pure OEM.

If you’re tired of wasting diagnostic time, get the OEM list. Download the Factory Manual from AutoRepairManuals and keep it on your tablet in the bay. (The retarder section alone is worth the price if you’ve ever fought a reset sequence.) For anyone working on a manual transmission version of these trucks, the Manual Transmission article on Wikipedia gives basics, but not OEM data – that’s what this manual delivers for the electronics.