VemsAudiAan (2007-08-14 14:33:49)

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

This involves

Use this template for your measurements.


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 bad:\nÿ1ÿ

good:\nÿ2ÿ


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.

This step assumes you successfully made all the above steps.

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