No Communication with PCM

I've got a customer with a '97 f350. he had a banks chip installed. chip came loose and caused the truck to start acting up. we removed the chip and he now wants a tuner instead of a chip. we ended up get him an edge evolution programmer.

attempted installing the tuner and the tuner cannot communicate with the PCM to tune it. i tried hooking up our genesis scanner to see if it would communicate. same thing, no communication.

anybody have some advice on what we need to do? not sure if its a wiring problem or if its the PCM itself.

I would start by checking all the underhood fusebox fuses. Does the Wait-to-Start light come on? Does the CEL do its 1/4 second flash when the key is turned to Wait-to-Start or does it stay on continuously (or not come on at all)? Cheers!

Patrick Feeley said:

I would start by checking all the underhood fusebox fuses. Does the Wait-to-Start light come on? Does the CEL do its 1/4 second flash when the key is turned to Wait-to-Start or does it stay on continuously (or not come on at all)? Cheers!

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Everything operates as normal. Truck runs and drives fine.

webb06 said:

Everything operates as normal. Truck runs and drives fine.

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Does the tuner power up at all? Correct me if i'm wrong but is the OBD11 port on a OBS powered by the Cigarette lighter fuse like the SD's? I remember my old bully dog tuner wouldn't power up because that fuse was burnt out on my 7.3 SD.

Powerstroke Man 6.4 said:

Does the tuner power up at all? Correct me if i'm wrong but is the OBD11 port on a OBS powered by the Cigarette lighter fuse like the SD's? I remember my old bully dog tuner wouldn't power up because that fuse was burnt out on my 7.3 SD.

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Tuner powers up and I can scroll through everything to start tuning, once it gives me the "turn key to run" it says error cannot communicate.

Mine is doing the same thing. I will be watching this thread to see where it goes. Except mine is little more severe, truck wont start at all.

Check the cigar lighter for operation. The OBD II port gets its 12+ volts from the same fuse, most diagnostics won't work unless it sees 12+ volts at the port

old man dave said:

Check the cigar lighter for operation. The OBD II port gets its 12+ volts from the same fuse, most diagnostics won't work unless it sees 12+ volts at the port

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It's not the fuse. The tuner powers on and so does the scanner. It's something with the PCM or wiring.

Hook a scan tool to it. If the scan tool works its the PCM

96F350KID said:

Hook a scan tool to it. If the scan tool works its the PCM

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Already said the scanner can't connect either

Need a PCM

96F350KID said:

Need a PCM

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Unfortunate for the customer. He may just decide he doesn't need a tuner lol

96F350KID said:

Need a PCM

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:whs:

If this ends up being the PCM, this will be the fourth time I have seen a case like this. Everything runs and works fine/normal, except you cannot communicate to the PCM.

Try swapping in a known good PCM if you have access to one.

Justin@DP-Tuner said:

:whs:

If this ends up being the PCM, this will be the fourth time I have seen a case like this. Everything runs and works fine/normal, except you cannot communicate to the PCM.

Try swapping in a known good PCM if you have access to one.

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I'll have to see if I can track one down.

The PCM needs to be flashed and erased of all memory it has to stock then put the Edge back on. Might need local stealership to do this.

Spud Monkey said:

The PCM needs to be flashed and erased of all memory it has to stock then put the Edge back on. Might need local stealership to do this.

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How do you suggest I do that if my IDS can't even communicate with the PCM?

Guess it's time for new PCM then.