Electrical Pcm
- Thread starter Jaime Tucjer
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wmburns
SN Certified Technician
Just wondering. What model year Mustang are we dealing with?
But to answer your question. Yes, yes, and Yes. As well as it could be a ton more things in addition to what you have already mentioned.
Do you have access to an ODB2 scanner? If so this might make short work of the problem. Here's some information about an affordable windows based ODB2 scanner:
ForScan ODB2 scanner w ELM327 USB
https://www.stangnet.com/mustang-forums/resources/forscan-odb2-scanner-w-elm327-usb.57/
One sure fire way to check the PCM is to see if an ODB2 scanner will "talk" to it.
If you are looking for other methods to start trouble shooting, Here's some information on how to access the cluster diagnostic mode. This doesn't work on all model years. But the cluster diagnostic method gives a DTC code that can be looked up.
Cluster Diagnostic Mode
http://www.allfordmustangs.com/forums/v6-tech/49159-diagnostic-mode.html
But to answer your question. Yes, yes, and Yes. As well as it could be a ton more things in addition to what you have already mentioned.
Do you have access to an ODB2 scanner? If so this might make short work of the problem. Here's some information about an affordable windows based ODB2 scanner:
ForScan ODB2 scanner w ELM327 USB
https://www.stangnet.com/mustang-forums/resources/forscan-odb2-scanner-w-elm327-usb.57/
One sure fire way to check the PCM is to see if an ODB2 scanner will "talk" to it.
If you are looking for other methods to start trouble shooting, Here's some information on how to access the cluster diagnostic mode. This doesn't work on all model years. But the cluster diagnostic method gives a DTC code that can be looked up.
Cluster Diagnostic Mode
http://www.allfordmustangs.com/forums/v6-tech/49159-diagnostic-mode.html
Its a 99 mustang gt. i do have a scanner but it want hook up says cant communicate, The key is $85 just want to be sure.
wmburns
SN Certified Technician
Perhaps the fact that the ODB2 scanner won't communicate with the PCM might be a sign that the PCM isn't working...........
The PCM and the cluster have to exchange information for PATS to "prove out". It would be EXPECTED to have an "apparent" PATS issue IF the PCM is not powered up.
IMO the odds do not favor this being as simple as a bad key. If it's your intention to spend $$ on only the parts that are needed then more trouble shooting will be necessary. Do you have a Volt Ohm Meter (VOM) and are you willing to use it?
wmburns
SN Certified Technician
Check all fuses in the battery junction box located in the engine bay.
CONFIRM +12 key on power in and out of fuse F2.34, F2.2, and F2.8. Use a KNOWN good ground.
1999-2004 MY fuse panel schedule:
http://www.allfordmustangs.com/foru...r-swap-wont-fire-please-help.html#post2669271
IF no power in fuse F2.34 suspect an ignition switch problem.
If no power in fuse F2.2 and F2.8 suspect a CCRM problem.
Review the information in the crank with no start check list.
1996+ Crank with no start check list
http://www.allfordmustangs.com/forums/4-6l-tech/336452-1997-mustang-wont-ignite.html#2984838
CONFIRM +12 key on power in and out of fuse F2.34, F2.2, and F2.8. Use a KNOWN good ground.
1999-2004 MY fuse panel schedule:
http://www.allfordmustangs.com/foru...r-swap-wont-fire-please-help.html#post2669271
IF no power in fuse F2.34 suspect an ignition switch problem.
If no power in fuse F2.2 and F2.8 suspect a CCRM problem.
Review the information in the crank with no start check list.
1996+ Crank with no start check list
http://www.allfordmustangs.com/forums/4-6l-tech/336452-1997-mustang-wont-ignite.html#2984838
I understand that Ford has used several schemes behind their PATS method. Early on, it disabled only injectors, allowing the engine to crank, but obviously not start....(Nuts, IMO). Later, as on my '04 Explorer, PATS disables all start-up function, that is, no crank, and thus no spark or injection. A fast-winking theft lamp indicates a PATS disable.
imp
wmburns
SN Certified Technician
Sooooooo. Did you following the instructions in the link provided on the "cluster diagnostic mode"? If so, it would be a great help to post the DTC codes.
wmburns
SN Certified Technician
I can't help you without information. What are the results of the fuse voltage tests (mentioned in post #6)?
If unable/unwilling to get this information then perhaps some thought should be given to using the services of a professional.
If unable/unwilling to get this information then perhaps some thought should be given to using the services of a professional.
Last edited:
wmburns
SN Certified Technician
Which browser are you using? Have you tried using Chrome?
Come here for Mustang and Droid support!
IF fuse F2.34 has power even with the key out, THEN:
- bad ignition switch.
- Wiring fault such that multiple circuits are shorted together.
- you are testing the wrong fuse. Does the battery run down in this car? Because if fuse F2.34 is being powered all of the time, it would certainly run the battery down.
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