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Air Mass Meter and Oxygen Sensor test results - do they need replacement? 200 1986

uid 27's pic
posted by  Art Benstein on  Tue Jul 29 15:18 CST 2003
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Hi David,

Again, you are absolutely right. My mistake. I forgot about the series resistor, only focusing on the memory of a discrete transistor that looked like it could dissipate 150mW at least. I'm sure it could switch that 2W (1.2W?) lamp if you had its collector directly available, but it is not, as you found out. Here's a copy of my notes now that I'm home:



You asked how it should look during driving. I've only done that for any length of time with an LH2.0 car. As you'd expect, the duty cycle varied a lot during the dynamics of acceleration. Deceleration was interesting too, because at certain engine and vehicle speeds the injectors are actually shut off for a while.

I guess if you want to run the dash light, another external transistor is in order - better than doing a resistorectomy on the ecu...

PS - I should have remembered the series resistor, as I thought at the time, the current limiter in the test LED tool wasn't even necessary in this application.
--
Art Benstein near Baltimore






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