A motronic55 install might save some time making a harness, but you must always verify the harness reasonably carefully.
This involves
- measurement of all used pins
- mostly DVM ohm-mode
- sometimes voltage mode
- visual inspection
- the injector part of the harness receives much heat. Insulation might be worn. It's better to fix ASAP, than to risk engine damage.
Documents and files to use
- [ motronic-AAN-ECxx.xls pinout spreadsheet]
- this is the most important docs, so you know pinout and function mapping. In MegaTune you will see names like EC36pin10 while you have it wired to some motronic pin. While you do the measurements, write the measured value and the pin you used, and any notes you think appropriate
- firmware 1.1.23.zip from [here]
- temperature calibration tables from EasyTherm
- coolant: NTC type 1900_256 or 2063_256 is a very good starting point
- MAT: PTC type 260_425 is a good starting point
- MegaTune (1.1.12 or later)
- latest v3gui.exe also [available here], useful for firmware upgrade and config dump. Use the latest (currently 2007-08-03)
- AAN starting config and tables
- note that better tuned fuel and ignition was made for 3B engine (and successfully applied to AAN as well), see MembersPage/MarcellGal/PowerAndTraction
- normally you have some preference at the time of order, like MembersPage/TeppoKalske (page bottom). Also consider that the crew who built and tested your device might have updated it!
Sensor measurements
Measure sensor resistance against AANpin30.
Take note of the temperature. If the engine is stopped for hours, the coolant and MAT will be close to ambient temperature.
Injector and idle-air output measurements
Measure injector and idle air pins against AANpin37 (that is the flyback pin, same function as EC36pin23 in standard VEMS docs)
- inj cyl1
- inj cyl2
- inj cyl4
- inj cyl5
- inj cyl3
Grounds
Measure that grounds are strongly (max 0.1 Ohm) connected inside the VEMS ECU.
- AANpin10
- AANpin19
- AANpin24
- AANpin30 sensor ground
- AANpin48 trigger ground
You can measure that most are connected in the harness, but at least AANpin30 (sensor ground) and AANpin... trigger ground are likely not connected.
Trigger
This step assumes you successfully made all the above steps.
This needs ignition on.
The secondary trigger crankhome-VR is already reversed. Resistance=...
WBO2 Rcal
Resistance between pin2 and pin6 of the 6pin WBO2 connector.
Eg. 117.5 Ohm (CORRECT this to actual value)