VemsAudiAan (2007-10-08 19:51:29)

A motronic55 install might save some time making a harness, but you must always verify the harness reasonably carefully.

This involves

Make your own page for your measurements like MembersPage/TormasiAudiAan, using this as a template. Steps:


Documents and files to use


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)


Ignition outputs

Check the spreadsheet (link above) with all the pins.

So this is old standard (with AANpin1 and AANpin23 swapped as in the original doc, only very few were made this way):\n

h[1]=00 48 36 24 12 00 00 00
h[2]=36 46 56 40 66 50 50 50

good:\nÿ2ÿ

If in doubt, just remove 1 sparkplug high-voltage wire at a time. make a small 1mm gap to ground (with a wire or a sparkplug) and issue the mdn.. spark-test to see if the right cylinder fires


Grounds

Measure that grounds are strongly (max 0.1 Ohm) connected inside the VEMS ECU.

Measure ECU pins: verify that all the above grounds are connected inside the ECU.

Measure that first 3 are connected in the harness. AANpin30 (sensor ground) and AANpin48 trigger ground are likely not connected inside the harness.


Trigger

The secondary trigger crankhome-VR MUST BE reversed. Can be done in the connector on the firewall.

Measure trigger resistance against AANpin48.

Reversing crankhome-VR polarity

Location of the trigger plug:

stik_trigger_morm_2.jpg

Wiring crank home normal:

stik_trigger_morm.jpg

Swap the red and violet wire:

stik_trigger_morm_1.jpg

The wire is swapped:

stik_trigger_byttet.jpg

HALL signal


WBO2 on SSC5 male standard - applies to audi AAN and 3B (also to BMW):

WBO2 on SSC4 male obsolete standard - was used before 2007-08 but than SSC5 became standard