haltech mapsensor change-offer to pay for switch

[Jörgen Karlsson]

Hi

I can't do the switch for logistical reasons.

But anyone with some electronic knowledge should be able to make
modifications for an external pressure sensor. The sensor in the ecu is
likely to be included in a three way voltage divider, the sensor in the
middle. The differential pressure over the sensor is then amplified and
converted to a ground referenced signal. With some knowledge of measurement
technique and a data sheet over either the lm324 or for the sensor itself
the signal conditioning circuit should be easy to identify. Where it
connects to the adc the trace must be cut, then only connect the external
map sensor with suitable protection and maybe a voltage divider and it is
finished.

By the way, I worked at Volvo, building cars when your car was built! Small
world?

Jörgen Karlsson
Gothenburg, Sweden


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