[Diy_efi] RE:'94 TBI Help!
RogeranCarol
rogerancarol at cox.net
Wed Dec 8 01:28:25 GMT 2004
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Clayton:
The '94 K1500 has a 23 pin jack under the dash that acts as an interface =
between the ECM/PCM (manual/auto trans) and the instrument panel, VSS =
buffer module and VSS, fuel injector power, and the ALDL connector.
Pin-h(red) connects the ignition switch directly to the injectors. The =
ECM/PCM also connects directly to the injectors with the enable ckts; =
Pin-J(pink/blk) connects the ignition sw. direct to the ECM/PCM for 12v =
(start/run). Note that the injector and VSS ckts are buried in the main =
harness from the engine to the "ECM/PCM"; the do not go to a fire-wall =
jack.
Other ckts interfaced through this jack include tachometer(pin-A), =
system ground(pin-B), upshift indicator(pin-D), ALDL ckts pins-E,F,&B, =
service engine light(pin-G), VSS buffer ckts (pins-L,M,&N).
I didn't indicate the associated ECM/PCM pin #'s because the differ =
between a manual tran application(ECM) and autotrans app(PCM).
When doing an engine trans plant, such as you are doing, or like I just =
did--shoe-horned a '94 5.7L TBI from a K1500 into an '88 Jeep Cherokee, =
I feel you'll save yourself tons of aggravation and hours of research if =
you'll just buy the appropriate factory manual. I have GM's #NATP-9442: =
Drivability, Emissions, and Electrical Diagnosis Manual. It hourly =
discusses both the ECM and PCM applications and differences in great =
detail. Plus includes all electrical diagrams and pin-outs.
Another source for ECM/PCM wiring diagram that I found fairly accurate =
is Mitchell wiring diagrams for domestic light trucks and vans; I found =
this in the reference section of my local library.
Hope this helps
Roger
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<DIV><FONT face=3DArial size=3D2>Clayton:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The '94 K1500 has a <U>23 pin jack =
under the=20
dash</U> that acts as an interface between the ECM/PCM (manual/auto =
trans) and=20
the instrument panel, VSS buffer module and VSS, fuel injector power, =
and=20
the ALDL connector.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Pin-h(red) connects the ignition switch =
directly to=20
the injectors. The ECM/PCM also connects directly to the injectors with =
the=20
enable ckts; Pin-J(pink/blk) connects the ignition sw. direct to the =
ECM/PCM for=20
12v (start/run). Note that the injector and VSS ckts are buried in =
the main=20
harness from the engine to the "ECM/PCM"; the do not go to a fire-wall=20
jack.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Other ckts interfaced through this jack =
include=20
tachometer(pin-A), system ground(pin-B), upshift indicator(pin-D), ALDL =
ckts=20
pins-E,F,&B, service engine light(pin-G), VSS buffer ckts=20
(pins-L,M,&N).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I didn't indicate the associated =
ECM/PCM pin #'s=20
because the differ between a manual tran application(ECM) and autotrans=20
app(PCM).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>When doing an engine trans plant, such =
as you are=20
doing, or like I just did--shoe-horned a '94 5.7L TBI from a K1500 into =
an '88=20
Jeep Cherokee, I feel you'll save yourself tons of aggravation and hours =
of=20
research if you'll just buy the appropriate factory manual. I have GM's=20
#NATP-9442: <U>Drivability, Emissions, and Electrical Diagnosis =
Manual</U>. It=20
hourly discusses both the ECM and PCM applications and differences in =
great=20
detail. Plus includes all electrical diagrams and pin-outs.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Another source for ECM/PCM wiring =
diagram that I=20
found fairly accurate is Mitchell wiring diagrams for domestic =
light trucks=20
and vans; I found this in the reference section of my local=20
library.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Hope this helps</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Roger</FONT> </DIV></BODY></HTML>
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