Lukosisp

Hello, after long time I've already put s2 engine to my s1 chassis. I've used s1 chassis wiring harness and started it with s1 hi power ecu. The problem is that electronic power steering doesnt work you start the car wheel shakes a little and then stops (not a connectors problems) Also the abs and dsc fault are on dashboard.
From where does the eps takes data, maybe I should check or insert something from s1 engine?
Maybe someone knows what I've missed?

Ricky SE3P

iTrader: (10)

How about the well documented incompatibility of the S2 electronics/engine with the S1 car. "Square block, triangle hole..."

Remove the S2 engine and put a S1 engine. Why bother putting in a S2 engine in the first place?

Lukosisp

Im trying to build a track car, which only runs on premix, omp removed. The point is I had rebuild s2 engine in the garage, and old s1 had passed away. The ecu is from s1, all wiring too, throttle from s1 engine. Everything runs perfectly but eps doesnt want to work ant there is 2 errors one in abs module: c1805 abs and pcm mismatch and in eps: b2278 torque sensor. Before mounting s2 engine everything worked fine. I know that to make work s2 engine as it should it would be much easier, to just buy original s2 r3, but the point is why it shouldn't work with s1 ecu and harness?

Ricky SE3P

iTrader: (10)

Well... first problem I can think of is the fact that the Rx8 series 1 computer and engine wiring harness is not compatible with the series 2 engine. Your series 2 engine has fewer injectors (and differently rated flow rate injectors than the series 1 engine has), the APV wiring and sensor setup is all different, im sure there is more than just that too.

Not to mention no OMP, yeah your car is going to freak out about that and force limp mode. Even if you dont have the OMP mounted to the engine and use a block-off plate, you need to have the OMP connected so that the ecu is happy.

Also sounds like you are using a different ecu than what the car came with possibly or a different abs module? The two are not currently paired causing you some issues and both need to be reflashed with as-built data back to stock configuration so they will communicate with one another.

Sounds like you also probably messed up some of the EPS wiring during your little swap. The torque sensor is the one at the part of the rack where the input comes from the steering wheel.

You cant Voltron something together with these cars, its not going to work that way. Not easily at least. Read up on the fast differences between the Series 1 and Series 2, as well as part compatibility and review what others before you have done on their builds. Sounds like you might have skipped through a lot and are underprepared for this endeavor.

Lukosisp

I'm using only block from s2 engine intake manifold with injectors are from s1 hi-power, omp still connected from s1 model too. Ecu and abs module are from the same car(s1). I know where the torque sensor is, but the point is on live data steering angle sensor works fine, same as torque sensor. I think reflashing might be the answer, because my rx8 are built from almost scratch. Is there possibility that wiring harness makes troubles? Because in engine bay theres is wiring from s1 hi power, wiring under the dashboard are from low power, and the rest harness are from hi power too.

TeamRX8

iTrader: (25)

EDIT: sorry, this should be what you need, I remembered that it had been done before

https://www.rx8club.com/rx-8-racing-...rx-8-a-254874/

However, those other issues are likely related to something other than the actual S2 engine change
.

Stubbs

iTrader: (1)

The EPS B2278 code on the torque sensor indicates an open or short somewhere in the wiring between the EPS control module and the torque sensor. If you are seeing the correct response from the sensor on your scan tool, try clearing the codes and see if comes back. If it comes back you may have a bad connection and/or damaged wire in the harness causing an intermittent short or open. It's possible the sensor is damaged causing an internal short/open, but probably not likely.

ABS C1805 code means the DSC and ECU configuration don't match. You'll need to pair them with a WDS module. Then perform the initialization for the Combined Sensor and Steering angle sensor.

If you don't have the online service manual already, PM me and I can send you a link.

Lukosisp

THANK YOU! Your links helped a lot, the problem with eps was that under the hood all wiring are form r.h.d engine, but my car is l.h.d so just switched connectors on my eps noise filter and it works great. And talking about abs module I'm going to mazda service to reflash abs and pcm.