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016 AMM burn off details? 200 1989

posted by  Frodo on  Mon Nov 11 08:52 CST 2002
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Hi, I have a AMM that might be bad.
I bought a secondhand 240 wagon and have tried to fix all the small troubles. Seeing the aluminum tube from the airbox disconnected, I connected it to the manifoil... Guess what, now the idle are 1000-1500 rpm, if I disconnect the AMM it is a steady 800 rpm.

What I want to know is details about the burnout function, is it controlled inside the AMM? I know the ECU (LH 2.4) should be sending a 4V signal on AMM pin 4 (not sure, someone borrowed my manual), but I measure 18Kohm resistance between pin 4 and 1+2, that means the platinum-wire is not connected directly to pin 4. Is this 4V signal just a trigger to the internal burn-out circuit pouring current through the wire?

I was wondering if it was possible with a manual burnout off the car...

Measuring 3-4 ohm between pin 3 and 1+2, I think this is the wire, but I don't dare to push current into the signal output and damage some circuit.


I have opened the ECU and fuel relay and soldered all questionable pins, used contact-cleaner on all connectors from AMM to ECU.

AMM voltage is 2.3V when idling in 1100 rpm (temperature 2 degrees C), O2 signal lays below 0.5V when warm.

I have heard about adding a 0.2 ohm resistor between pin 1 and earth to test AMM. Does anyone know where pin 1 is connected to earth, I dont want to cut the wire?






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