Car Starts on stock ECU, not with PFC
 

Can anyone throw some ideas my way? Its a brand new PFC. The car will only crank and crank and crank. If I plug the stock ecu back it, it fires right up.

The Green/Black CAS wire has been cut, and it looks like the previous owner ran a new wire to the CAS.

Why would the car start on the stock ecu but not all on the PFC?

Having a Datalogit would make it easier to diagnose.

From memory: Go to monitor-->1 channel. Select RPM. Press "next" so that you have what looks like a chart format. When you turn the engine over (Key in start position to crank) do you see rpm rising up? There should be a line rising up.

Does the commander light up?

Yes, it does. Ill post a pic of sensor values when I get home. Ill also check the rpm.

With the stock ecu installed, these are the codes its showing

05 - Knock sensor ??????
28 - Solenoid valve (EGR) <-----disabled/removed
30 - Solenoid valve (split air bypass) <-----disabled/removed
34 - Solenoid valve (idle speed control) <-----unplugged
38 - Solenoid valve (accelerated warm up system) <-----disabled/removed

When cranking the engine, the PFC shows 0rpm, as well as the Tach.

https://www.rx7club.com/attachment.p...1&d=1333229767
https://www.rx7club.com/attachment.p...1&d=1333229786

I took out the alternator and found where the g/b CAS wires were cut and half-assed back together. i crimped new ends on and half-assed them back together again, and now the car starts, runs, and goes fast. do this readout look ok at idle? the pfc didnt seem to go through a learning process....is this because i had it mapped?

Nvm.

thewird

Hope its okay to hijack your thread a little, I have the same problem as you had in the first place but my commander doesn`t start at all and I have tried 2 PFC in the car but the stock ecu (Knight Sport ECU) it fires up.

Any ideès?

The PFC requires all four of the grounds to be in good order (4A, 4B, 4C, 4D). I have seen cars with stock ECU's run fine with one missing, then install a PFC and get nothing. So this is the place that I would start looking.

Okay, I will check them :) Thanks

According to my electrical-diagram 4D is for the Metering Oil Pump?
Do I have wrong diagram??

OMP is 3A, 4I,4J,4K,4L

I do not know what you are looking at but it is not the correct pinout for the 93 FD.