89' 200tq: Air Temp & Hall Sensor

["mike jones" <depolom68@hotmail.com>]

I've been trying to track down a problem with the knock sensor in my 89' 
200tq. Now that I'm waiting for my new knock sensor to arrive after 
checking it's leads and connectors, I'd thought I'd check out some other 
components that would cause the check engine light to come on. I've 
checked the resistance on the air temp sensor without disconnecting it 
from the ECU. The reading I got was 500 ohms. I read that the sensor has 
to be disconnected in order to take the readings. Could this mean that 
it is not making connection with the ECU somewhere down the lines? Also 
I was wondering if anyone could tell me how to check to see if my Hall 
Sensor is in working condition.


thanks,
Mike

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