Please help new to forum! 03 Mach 1 No Communication via PCM/ECU

[BlueMach]

Hi all, I own a 2003 Mach 1 and I’m having an issue where car turns over but won’t start. No reading in my kms just - - - - - - - - (dashes) and theft light flashes. I’ve tried everything I could so I had car towed to dealership for keys to be reprogrammed but they said it couldn’t be done as there is no communication to ECU/PCM. Ford doesn’t supply new computers for this car (smh) anyway I’m trying to see if anyone has had similar issue with this. Thanks

[RedSN]

edit: missed the part where you said car turns over.

[ZR]

Look for blown fuse first.

[ZR]

Assume you've also tried your spare key?
Second most common issue, code reader in the column itself goes bad.

[BlueMach]

I’ve checked fuses, and tried both keys, dealership says computer needs replacement. They can’t get them, I’ve found some but it’s like $550 and I really hope it repairs this problem. I’m already in the hole to dealership and having to tow it twice now...

[ZR]

Was there an issue that led up to this happening?
Is the car tuned? (SCT or otherwise)

[BlueMach]

Back in 2004 I put 4:10 gears and an sct XCalibrator was used to set gear ratio

[BlueMach]

Basically I started the car it ran for 1-2 mins shut down and hasn’t started again. Just turns over, fuel pump doesn’t come on as I assume computer isn’t sending power to it.

[ZR]

Do you have power to any of the sensors?

[ZR]

Sorry to come back to fuses, did you check all the Maxi fuses under the hood as well (always suggest testing via test light vs meter)? No communication could also be ECM fuse blown, just had a Cobra in with similar symptoms that turned out to have a dead short.

[Ponyryd]

Did they actually check feeds and grounds to the computer?

[BlueMach]

Maxi fuses are ok tested with test light.
The electric fan from rad runs as soon as key is in run position. Someone said that’s a default showing pcm is bad?

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@ponyryd to be honest I don’t know if they did...

[Laffs]

Have you checked your CCRM relays?

[ZR]

or just pull plug out of it n turn key on.

[BlueMach]

@ZR when you say plug, you mean main computer plug? Or module? Thx

[Laffs]

I believe he means unplug the CCRM relay module in the passenger side front fender and see what it does.

[Ponyryd]

Maxi fuses are ok tested with test light.
The electric fan from rad runs as soon as key is in run position. Someone said that’s a default showing pcm is bad?

- - - Updated - - -

@ponyryd to be honest I don’t know if they did...

Fan will run if there’s certain hard faults I beleve.....it’s a default to protect the engine from overheating if the pcm is unable to accurately monitor the conditions.