Error codes for a 2002 S8 RX7
 

I reset the ecu and checked for codes on my 2002 RX7. I managed to pull code '56' i.e. 5 long flashes followed by 6 short ones.

I know it's not on the list, but that's what I counted at least 10 times just to make sure. Got me stumped.

Anybody?

Go to the 3rd gen FAQ thread and go to the link for ECU Codes
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/

Cheers.

Like he says no code for 5-6; but then it is a totaly different ECU so maybe none of the codes mean the same.

hi! did you find what 56 means?

sorry itrust for replying so late...i found out error code 56 is a general mazda code (not rx7 specific)...the code is 'poor earth connection'..as you might well be aware of, when it comes to earth/grounding systems on cars, the problem could be anywhere..there are a few grounding points (not sure where they are on a FD) over the car and sometimes a quick rub with emery paper (on the contact surface as well) fixes the issue...i'd even suspect the stock ecu going wonky over time/heat and your FD needing a power fc injection :)

I think there are others, but factory grounds on the FD that most use are (a) on the right side of the engine at the rear of the upper intake manifold..between the engine hoist hook and firewall (b) left side of the engine block (IIRC) on the center iron running to the chassis (c) ground 'strap' on the aft flange of the cat to the body. Due to it's location this one typically gets dirty or breaks the quickest and is needed inorder to get a good signal from your O2 sensor.
Using 6 gauge wire I also ran auxillary grounds from (1) negative battery terminal to engine (2) engine to chassis and (3) chassis to negative batter terminal.

In my experience the stock ECU is pretty reliable unless abused...taken apart, exposed to excessive moisture etc.
A PFC is not needed on a near stock car at stock boost levels unless you intend to remove emissions equipment. Even then you can do it on the stock ECU with some resistors...it's just easier with a PFC.

+1