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Old 07-27-2006, 02:03 PM   #6
Scooby Specialist
Member#: 27108
Join Date: Oct 2002
Chapter/Region: MWSOC
Location: Detroit-ish, MI
2004 STi
2004 A4


Originally Posted by SloRice
Tony - so you piggybacked the stock MAP sensor signal off of the DTEC MAP sensor?
No, what I was doing didn't involve a DTEC at all. I was splicing the signal from the stock MAP sensor... I was just saying that it seemed to work out OK. If you do something similar with the DTEC MAP sensor, both the DTEC and the ECU should get the same MAP signal voltage.

Originally Posted by SloRice
The last picture I posted shows the wires inside the shield that go to the DTEC MAP sensor.
From the DTEC manual, it looks like the connector on the DTEC itself (goes to both BCS and MAP) is a 4-wire connector, but the connector further down the line that goes to just the MAP sensor is *also* a 4-wire connector. Odd.

If I had to guess.... the four wires at the DTEC are probably:
- power to MAP (probably 5V)
- ground for MAP
- signal from MAP
- BCS control signal (since the BCS has its own ground)

If you're going to splice into the wire at/near the MAP sensor, you can figure out which one is the signal wire with a voltmeter. Compare what you read at each wire when the key is "ON" with the engine running and not running.

From the service manual, it looks like the orange(?) wire at the factory MAP sensor is the signal wire. The other two are the power and ground for the factory sensor.
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