Using a Multimeter to check grounds on an ECM
06-16-2018, 07:48 PM
#1
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Using a Multimeter to check grounds on an ECM
I have an 88 vette and was attempting to check the grounds on the ECM cable connector.
I did a check on 5 pins (A12, D1, D3, D6 & D10)
My multimeter has different settings for the DC voltage
500, 200, 20, 2000m & 200m
With the key in the on position and checking each pin with the meter set to 2000m, I got 0. But when switched to 200m I got the following
1.2, 1.4, 1.0, 1.0, 1.0
I'm not very comfortable using a multimeter and don't really know what those readings mean. Is that telling me I've got a 1.4 volt drop???
Any help would be appreciated... Thanks in advance
I did a check on 5 pins (A12, D1, D3, D6 & D10)
My multimeter has different settings for the DC voltage
500, 200, 20, 2000m & 200m
With the key in the on position and checking each pin with the meter set to 2000m, I got 0. But when switched to 200m I got the following
1.2, 1.4, 1.0, 1.0, 1.0
I'm not very comfortable using a multimeter and don't really know what those readings mean. Is that telling me I've got a 1.4 volt drop???
Any help would be appreciated... Thanks in advance
06-16-2018, 08:57 PM
#2
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Thread Starter
The "m" is Millivolts. 2000 Mil ("thousand") is 2.0 Volts. 200 mil is 2/10th of a volt. Mentally move the decimal point in your reading one place to the left when on the 200mv scale to calculate the reading in decimal fractions of a volt.
1.2 = .12V ("point one two volt")
1.4 = .14V (point one four volt)
1.0 = .10V (point one; one hundred Millivolt; one tenth of a volt).
Your readings are fine as far as voltage drop is concerned.
1.2 = .12V ("point one two volt")
1.4 = .14V (point one four volt)
1.0 = .10V (point one; one hundred Millivolt; one tenth of a volt).
Your readings are fine as far as voltage drop is concerned.