Bizarre Code after ECM swap

[FSUSHO]

I recently swapped from the stock 93 ATX ECM to a D4U1 (wow!) from a 95 ATX. After an initial break in, the CEL flashed. So I ran through the self test procedure and pulled a code 72. Any ideas?

(Ford used 2 digit codes 89-91; 3 digits from 92 on for anyone who doesn't know why I'm confused.)

I now know why the D4U1 is a recommended upgrade. The car is much more fun with it.

 

[SHO Dude]

That's proll'y code 172.

Code 172 is a mixture code. I think it's bank 1, but I don't remember for sure.

Shouldn't have anything to do with swapping teh PCM's. Speaking of which, why would you change from H3Z to a D4U1?


Doug Lewis
[email protected]
Ford Performance Specialists
Atlanta Georgia
770-949-7191

 

[FSUSHO]

From what I've seen and read, the D4U1 has a better program for shifting points. The car definitely runs better now.

The code was definitely a 72. I checked it 4 times. A 172 would make alot of sense, it just wasn't coming out like that. I'll have to check it again. On the way home today it started giving me a CEL intermittently. If I could just get it to stay on it would be great. I was figuring it was the O2's, but who knows. After Frances I'll get a better look.

 

[ViPER1313]

On the way home today it started giving me a CEL intermittently.

Mine did the same thing when the O2s went bad.

 

[FSUSHO]

That's what I'm thinking, but without the benefit of a data streaming code reader, it's a shot in the dark. I have noticed a bit of a decline in fuel economy, but I'm a bit of a lead foot. The car doesn't appear to be running rich/lean either.

When I get time I'm going to try and hijack the harness with my multimeter and see what the range is. Unless anybody has a better idea first.

 

[Ferendon]

Get the car up to NOT (Normal Operating Temp), and let her run for a couple minutes after that. Get behind it and take a wiff of the exhaust... Not the funnest thing in the world but it can tell you alot. If you smell gas you're running rich. The car runs rich at start up to get it warm, so that's why you let it warm up to NOT. You can drive it or w/e, just make sure it's warm. A rich condition is often a result of a bad 02 sensor.

Check the code again carefully

522 (O) Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault - PNP
Transmission MLP sensor out of range in park - Transmissions

That one could be mistaken for a 72 and it's for an ATX.