C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

94 diagnostics

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Old Jun 25, 2013 | 11:34 PM
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Default 94 diagnostics

I have a 65 C10 truck that I have installed a 94 Corvette LT1 with a stand alone harness and programmed PCM. When I got the engine I replaced most sensors including MAF and replaced the distributor. I am having some running issues and have tried to use my scan tool but no luck. I'm using an OTC 4000E and now it shows I need a special cable#3305-86.

Anybody have a lead on one of these cables or have another idea of what to use for a scan tool?
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Old Jun 26, 2013 | 06:15 AM
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Originally Posted by 1enick72
I have a 65 C10 truck that I have installed a 94 Corvette LT1 with a stand alone harness and programmed PCM. When I got the engine I replaced most sensors including MAF and replaced the distributor. I am having some running issues and have tried to use my scan tool but no luck. I'm using an OTC 4000E and now it shows I need a special cable#3305-86.

Anybody have a lead on one of these cables or have another idea of what to use for a scan tool?
94 and 95 Corvettes are unique in that the PCM's use the first generation OBDI diagnostic protocol, the scan tool connector however is visually identical to 96 and later OBDII vehicles. I am not familiar with the OTC 4000E but do know many scan tools cannot read the older OBDI data without specific adapters and software. If your harness includes a malfunction indicator lamp (MIL) you can retrieve codes using the paper clip method, see the link below. Other options would be to acquire the correct adapter and software if it is available for your existing tool, or locate a Tech1 or other OBDI compatible scan tool.
http://www.digitalcorvettes.com/foru...56&postcount=9
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Old Jun 26, 2013 | 06:00 PM
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I've made the repairs for the codes that I had and now I need to look at some data.
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Old Jun 26, 2013 | 06:09 PM
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Another option here if you have a laptop.http://www.moates.net/gm-19851995-c-64.html
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Old Jun 26, 2013 | 10:55 PM
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Ebay has a large number of different OBD1 to OBD2 gender changers.

You have OBD1 and that is what your scan tool needs to read but it needs the gender changer to hook up to your ALDL port.

Install the changer and configure the code reader to 94, 4th VIN P,
Truck No and 8th VIN Y and away you go.
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