Nissan Maxima ignition coil low amp probe test
Posted to Technical Tips Forum on 9/3/2008
5 Replies
I get calls and emails occasionally on this and the main
question concerns finding the "loop" to connect the low amp
probe to.
[2000 Nissan Maxima, Ignition Photo]
[2000 Nissan Maxima, Ignition Photo]
The loop shown here is only on the 2000 up, what I used to
call the "new body".
There is a loop on the other end (front) of the engine but
if you look at the wiring diagram you will see it is only in
series with the #1 coil on the B+ side. That would explain
why you can only pick up one coil :) This loop is also on
some of the "new body" cars. I don't know why it's there but
I see little use for it in diagnostics. The loop referenced
above, on the other end of the 2000 and newer cars, does not
show up in any diagram I've seen but I've never seen it fail
to be there.
You can check the older COP cars almost as easy as
the newer ones. Every one I've tested have had the ground
for all the coils in the same place.
[89 and older Maxima with coil on plug ground location]
[99 and older Maxima with coil on plug low amp
connection]
This is on the lower intake, front side of the engine. The
car I used for this was a 99 and it is ground F19 on this
car. I think it is on the right bolt but looking at my on
picture I can't say for sure. It's for sure one of these two
and it's always been a solid black wire. Just set your scope
up at 10A and 200-250MS and keep clamping around wires until
you get the pattern you're looking for, then fine tune from
there. Here are a couple of captures from this car.
[99 Maxima coils]
[1999 Nissan Maxima, Ignition waveform]
Bill from Kentucky
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