[Diy_efi] FW: [fangle] Testing an inductance coil.
Joe Boucher
boucherj at prodigy.net
Tue Aug 16 02:35:12 UTC 2005
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What I want to test is an inductance coil. I purchased an analog AirSensors
EFI unit over a year ago[Joe Boucher] at a swap meet . The kid told me the
entire kit was there. However, the temp sensor was missing. A week ago I
found a source for the part. So, I started testing.
There are some LED's in the box indicating if certain functions are working.
The only inputs are the mass air flow sensor, temperature, ignition on, tach
signal from coil, and an inductance coil wrapped around the second firing
spark plug wire. Outputs are fuel pump power, an optional fast idle signal,
and the four injectors.
I'm not sure if the inductance coil wrapped around the wire is working. All
the LED's went out, but the injectors didn't fire when I hooked up the tach
and inductance lead to the Camaro. The coil has to be oriented properly to
the wire and I think it was correct. Didn't have time (and the idea) to try
swapping the coil. The diagnostic trees in the manual list the coil has a
requirement for firing. I think. It's not a great manual.
I want to test the coil. All I have is a multi-meter. It does have a
frequency function. I used it to test the tach signal. There was a
frequency that increased and decreased with engine speed from the tach
signal. Can I use the frequency meter to see if there is a signal [Joe
Boucher] from the spark plug coil without destroying the millimeter? Or
should I set the meter to AC and 20K volts and see if there is a signal?
The injectors are fired like most with the ground bring controlled to pulse
the injector. While the unit was "on", there was not 12 volts at either of
the lines into one of the injector plugs. One initially showed a signal but
the voltage quickly decreased to 0. That doesn't seem good. I will admit
the connection to the 12 volt power source was suspect, so I will do a
better job for the next test.
My plan is to try the test again, see if the inductance coil is working, try
flipping the coil, and see if there is voltage at the injectors. If not,
the next step is to open the box and see if I can spot where the magic smoke
has escaped.
Thanks for any help.
Joe
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<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2>What I=20
want to test is an inductance coil. I purchased an analog =
AirSensors EFI=20
unit over a year ago<SPAN class=3D739481902-16082005>[Joe Boucher] =
at a swap=20
meet </SPAN>. The kid told me the entire kit was there. =
However, the temp sensor was missing. A week ago I found a source =
for the=20
part. So, I started testing.</FONT></SPAN></DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2>There=20
are some LED's in the box indicating if certain functions are =
working. The=20
only inputs are the mass air flow sensor, temperature, ignition on, tach =
signal=20
from coil, and an inductance coil wrapped around the second firing spark =
plug=20
wire. Outputs are fuel pump power, an optional fast idle signal, =
and the=20
four injectors.</FONT></SPAN></DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2>I'm=20
not sure if the inductance coil wrapped around the wire is =
working. All=20
the LED's went out, but the injectors didn't fire when I hooked up the =
tach and=20
inductance lead to the Camaro. The coil has to be oriented =
properly to the=20
wire and I think it was correct. Didn't have time (and the idea) =
to try=20
swapping the coil. The diagnostic trees in the manual list the =
coil has a=20
requirement for firing. I think. It's not a great=20
manual.</FONT></SPAN></DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2>I want=20
to test the coil. All I have is a multi-meter. It does have =
a=20
frequency function. I used it to test the tach signal. There =
was a=20
frequency that increased and decreased with engine speed<SPAN=20
class=3D739481902-16082005> from the tach signal</SPAN>. Can I use =
the=20
frequency meter to see if there is a signal <SPAN =
class=3D739481902-16082005>[Joe=20
Boucher] from the spark plug coil </SPAN>without destroying =
the=20
millimeter? Or should I set the meter to AC and 20K =
volts and=20
see if there is a signal?</FONT></SPAN></DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial><FONT =
color=3D#0000ff><FONT=20
size=3D2>The injectors are fired like most with the ground bring =
controlled=20
to pulse the injector. While the unit was "on", there was not 12 =
volts at=20
either of the lines into one of the injector plugs. One initially =
showed a=20
signal but the voltage quickly decreased to 0. That doesn't seem=20
good.<SPAN class=3D739481902-16082005> I will admit the connection =
to the 12=20
volt power source was suspect, so I will do a better job for the next=20
test. </SPAN><SPAN=20
class=3D739481902-16082005> </SPAN></FONT></FONT></FONT></SPAN></DIV=
>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2>My=20
plan is to try the test again, see if the inductance coil is working, =
try=20
flipping the coil, and see if there is voltage at the injectors. =
If not,=20
the next step is to open the box and see if I can spot where the magic =
smoke has=20
escaped.</FONT></SPAN></DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2>Thanks=20
for any help.</FONT></SPAN></DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D414124301-15082005><FONT face=3DArial color=3D#0000ff =
size=3D2>Joe</FONT></SPAN></DIV><!-- |**|end egp html banner|**| --><!-- =
|**|begin egp html banner|**| --></BODY></HTML>
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