Date: Fri, 24 Jul 1998 20:31:26 -0500
Reply-To: Darrell Boehler <midwesty@TAOS.MIDWEST.NET>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: Darrell Boehler <midwesty@TAOS.MIDWEST.NET>
Subject: digijet tool testing
Content-Type: text/plain; charset="iso-8859-1"
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Hi All,
Jim Maginel fellow listee from Cape Girardeau MO.. dropped by with his
85 vanagon this afternoon and we proceeded to open up his spare digijet
after first making sure it was functional. I had a digijet tool all made
up and ready to test so our main concern was installing the cable on his
spare ecu. We developed a plan for attaching the cable and did so. We
tested the ecu with cable and all was fine. We connected the tool to the
ecu and we had a no start. We seemed to be missing coil pulses with the
tool installed . I had wired the digijet tool coil LED the same as the
digifant tool coil LED. It turns out the transistorized ignition control
unit to digijet pin 1 has a plus driver transistor, where the digifant
coil driver is a negative driver. So a quick rewire of the coil led and
we were functional.
The digijet seems very similar to the digifant . Without the heated
oxygen sensor it takes it longer to start controlling the fuel mixture other
than that there is little difference with the exception of the ignition
system being integrated on the digifant. The tool seemed functional, we
went on a 5 mile cruise and watched for problems and found none. All
readings seem very similar to the ones I had experienced on the digifant.
Like Temp1 , temp2, oxygen, and afm all read the same voltage as the
digifant. The digijet has the same 6 digital signals the tool monitors
power to the ecu, start signal , fuel pump on, throttle switch, coil pulses
, and fuel injector pulses. Even though the digijet has a separate ecu pin
for each injector all 4 fi ecu pins are common to each.
The digijet tool Jim is testing has a built in LCD voltmeter. It is
about 3x1.5x 0.5 inches. This is a feature many listees seem to be wanting
for the digifant tool also. I find this to make the tool more convenient to
use and it seems well worth the extra cost involved. The tool has a rotary
switch that allows selection of the 4 before mentioned analog signals plus
battery voltage and a probe for testing other points selected by the vans
person. The 6 LEDs , rotary switch, a db 25 pin female connector for
probing digifant / digijet ecu pins and the LCD volt meter are all built
into the top of a 6x4x2 inch black plastic box. The tool looks good,
probably could / should be made smaller but I like the present lay out.
Jim is going to test for a while and develop a set of tool operating
voltages for the digijet and we can see what develops from there. The
digijet tool Jim is testing has about $50 worth of parts in it. I need to
locate some better prices for parts and maybe I can drive the parts cost of
the tool down some more. Any and all suggestions are always welcome and
appreciated.
Darrell Boehler
Makanda Illinois
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