Cannot Read vehicle

[WillSpeed]

Hello, I did a search for my issues and tried all of the responses but still nothing.
I have an LS Gen3 swapped into my 84 Corvette and I went to read the vehicle through the VCM Editor and I keep getting a ?download boot loader request timed out?. As I said, I charged the battery, I removed fuses for the radio and a few other fuses and still get the same response. If I uncheck the box for ?Use High Speed? I get a x7f response we code instead of the time out.
Please help.

[Bill@HPTuners]

In this case we would recommend reading/flashing via bench harness, sounds like you have a wiring issue of some sort that is preventing reading.

[dhoagland]

Hello, I did a search for my issues and tried all of the responses but still nothing.
I have an LS Gen3 swapped into my 84 Corvette and I went to read the vehicle through the VCM Editor and I keep getting a ?download boot loader request timed out?. As I said, I charged the battery, I removed fuses for the radio and a few other fuses and still get the same response. If I uncheck the box for ?Use High Speed? I get a x7f response we code instead of the time out.
Please help.

Can you read it with another scanner?
Something like a Snap on that has vehicle tests and stuff. I would think if you have a harness issue nothing will communicate with it. If other scanners can communicate and command tests, clear codes, ETC... I would think your harness is good.
Just a thought

[Bill@HPTuners]

Can you read it with another scanner?
Something like a Snap on that has vehicle tests and stuff. I would think if you have a harness issue nothing will communicate with it. If other scanners can communicate and command tests, clear codes, ETC... I would think your harness is good.
Just a thought

Reading/flashing a vehicle is alot different than using a scanner or checking DTC's. Reading/flashing has much tighter restrictions because if something ain't right you can brick your pcm. You aren't bricking your ecm by reading dtc's

[WillSpeed]

Hey Bill, I went ahead and bought a bench harness. I unplugged my blue ECM connector and connected the bench harness to it. When I plugged the power into the bench harness I started hearing a clicking sound coming from the passenger side of the engine bay, not sure what the noise is. When I go to turn my vehicle over and start it, the engine spins but doesn?t start. Clicking sound still going on. What am I doing wrong?

[Bill@HPTuners]

Hey Bill, I went ahead and bought a bench harness. I unplugged my blue ECM connector and connected the bench harness to it. When I plugged the power into the bench harness I started hearing a clicking sound coming from the passenger side of the engine bay, not sure what the noise is. When I go to turn my vehicle over and start it, the engine spins but doesn?t start. Clicking sound still going on. What am I doing wrong?

That in no way sounds like a bench harness to me.

[WillSpeed]

That in no way sounds like a bench harness to me.

Hey Bill, I bought it from Amazon thinking it would work but obviously I am missing something. Some more knowledge from you is definitely in my list of needs. Lol. I went ahead and took the “bench harness” apart. It appears like there are not enough wires connected. I’m hoping my picture attached. If it didn’t, there are 4 wires in this harness. A black ground, two Orange powers, and one purple signal. I’m missing more, aren’t I?

[Bill@HPTuners]

Hey Bill, I bought it from Amazon thinking it would work but obviously I am missing something. Some more knowledge from you is definitely in my list of needs. Lol. I went ahead and took the ?bench harness? apart. It appears like there are not enough wires connected. I?m hoping my picture attached. If it didn?t, there are 4 wires in this harness. A black ground, two Orange powers, and one purple signal. I?m missing more, aren?t I?

This is what a bench harness typically looks like