Description

Alfa Romeo/mercedes-benz/audi 145, 146, 147, 156, 159 2008 Diagnostics Manual

I spent twenty-eight years turning wrenches in San Antonio, and if there’s one thing that burns my ass it’s a guy chasing an intermittent misfire with a generic scanner and guessing which protocol his ECU speaks. You pull a 1.9L JTD Diag into the bay, you need to know whether it’s communicating on K-Line or CAN, and you need that answer before you touch a wire. That’s why this Alfa Romeo/mercedes-benz/audi 145, 146, 147, 156, 159 2008 Diagnostics Manual sits on my bench. It’s a factory document – 57 pages, printed in 2008 – that lays out exactly which Bosch ECU (EDC 15C5, EDC 16C39, ME 2.8, etc.) lives in each variant, plus the diagnostic norm (OBD II, EOBD, K-Line/CAN) for every engine. No aftermarket guesswork.

Engine Control Units Covered: Bosch EDC and ME Systems

This manual covers the Bosch EDC 15C5, 15C6, 15C7, 16C8, 16C39, 15P, 15V, 15VM, 15P+ and Bosch ME 2.8, 2.7.1, 7.5, 9.1, 9.5.10, MED 17.5, MED 17.5.5. Alfa models 145, 146, 147, 156, 159 with JTD engines get full tables. Mercedes-Benz C32, E55, SL55, and Audi A2, A3 with TDI or TFSI are also included. Each row on page 1 gives you the exact ECU type and whether the system uses OBD II, EOBD, K-Line, or CAN. That’s the first thing you check before plugging in any scan tool.

Diagnostic Norms and Protocols Listed

On the first page you’ll see “Diagnose Norm” column with entries like “OBD II;K-Line” or “EOBD;K-Line/CAN”. That tells you the compatible communication protocol. If you’re working on a 147 1.9 JTD 16V (EDC 16C8), it’s EOBD with K-Line/CAN – not straight OBD II. Grab a generic code reader that only does OBD II and you’ll get nothing. That’s why I keep a dedicated K-Line interface for these jobs. The manual doesn’t waste space telling you which tool to buy; it gives the raw data so you can make that call yourself.

What Injection and Ignition Systems Are Included?

Alfa 145 and 146 run the 1.9l JTD with EDC 15C5 on OBD II / K-Line. Alfa 147 splits into 8V and 16V variants with EDC 15C7 or 16C8. The 156 gets both 1.9 and 2.4 JTD in various ECU versions. The 159 and 159 Sportwagon use EDC 16C39. Mercedes entries cover the M113 and M112 engines with ME 2.8 or 2.7.1, and Audi covers the 1.4 TDI PD and 1.8 TFSI with MED 9.1 or 17.5. If your car uses a Bosch ECU from this era, check the table. The manual covers over forty engine-ECU combinations in those 57 pages.

57 Pages – What You Actually Get

This isn’t a repair manual. It’s a diagnostics reference. No step-by-step for swapping a water pump. What you get is the factory spec on which diagnostic system each model uses, the Bosch control unit number, and the pin-level data you need to pull DTCs and read live data. The document is scanned from the original German Siemens/Bosch publication, so the tables are exact. I’ve seen third-party books that try to condense this into a one-page chart and inevitably get the protocol wrong for a 156 2.4 JTD. This gives you the full OEM table.

Trust Only Factory Diagnostics Data

I’ve had techs bring me aftermarket diagnostics guides that claim “universal” coverage. Those books list a single protocol for all Alfa 147s, but the manual shows two different EDC versions depending on JTD variant (8V vs 16V). That mismatch sends you chasing ghosts. The factory table on page 1 is the only source I trust. For the Mercedes models, it also shows whether the older “Diag alt” protocol (K-Line) or the newer Rund-G is used – a detail missing in most generic references. Automotive Industry Overview and On-board Diagnostics (OBD) are good background, but for your specific Bosch ECU, you want the original table.

Is This Manual Right for Your Job?

If you’re a home-garage guy trying to diagnose a no-start on a 2001 Alfa 156 1.9 JTD, this manual tells you that the EDC 15C5 speaks OBD II over K-Line. Get the right adapter and you can read codes. If you’re a pro who needs to verify the CAN bus protocol on a 159 1.9 JTDM before running an oscilloscope test, the table has that. For Mercedes: models like W203 C30 CDI (EDC 15C6) or W220 S55 (ME 2.8) are all listed. Audi A3 1.8 TFSI with MED 9.1 or MED 17.5 appears twice because of different calibration years. No guesswork.

FAQ

Can I use this manual for a 156 2.4 JTD 16V?

Yes. The manual lists the 156 2.4l JTD 16V with Bosch EDC 16C8 and EOBD with K-Line/CAN. It’s on the table.

Is this manual in English?

The original document is in German. However, the technical data (ECU part numbers, protocol abbreviations, pin labels, and DTC codes) is language-agnostic. If you can read “EDC 16C39” and “OBD II” you’ll get everything you need. The table headers are in German (“Hersteller”, “Modell”, “Motor”, “Steuergerät Typ”, “Diagnose Norm”) but with basic context you’ll navigate it fine. For wiring diagrams and further diagnostics, you may want to pair it with an English-language vehicle-specific manual, but for Bosch ECU identification and protocol selection, this is the fastest reference I own.

If you’re tired of guessing pinouts and scanning with the wrong protocol, this is the factory key. Maxitpms TS601 Diagnostics Manual – OEM TPMS & OBDII Guide covers TPMS and OBDII on US-market cars, while Magneti Marelli LINEA Diagnostics Manual – Factory ECU & Sensor Guide handles Italian ECUs. For heavy-duty truck diagnostics, see Launch HD_ASTRA, HD_BENZ, HD_BREMACH, HD_CUMMINS, HD_DAF 2010 Diagnostics Manual. But for your Alfa 145-159, Mercedes C/E/SL, or Audi A2/A3 Bosch systems, this 2008 manual is the one to open first. Access the Factory Manual and get back to fixing.