Rob@ReidyRacing

Hi all,

We have recently run into issues starting our project S2000 after it being fine for a good while and nothing has changed in the set-up.

The issue has baffled me, AEM, Rywire and our very knowledgeable tuner.

So just a brief insight into what's going wrong and what we I have observed.

The car is a 2001 model running AEM series 2 ecu and a Rywire Mil spec engine loom to ecu via mil spec firewall connector. Car has started fine ever since the dyno tune in October of 2012.

The car now however will not start.

- Cranks Strong

- Fuel pump can be heard priming and fuel pressure to rail and injectors

- Battery is at 12.89V

- Cam and Crank sensor resistance checks out to workshop manual spec

- Cam and crank sensor continuity check from sensor plug to ecu good

- Coils are getting voltage

- injectors are getting voltage

Problems noted

- Cam sensor has live feed even when ignition is off of full 12V

- related pin on ECU is giving out 12V feed to that pin on the cam sensor plug when ignition is off

- AEM tuner software (When connected to ecu and cranking) Shows no stat sync and ignition errors on each crank revolution.

Does anyone have any ideas of what might be going on.

Sent ECU and loom back to AEM and Rywire respectively and they both checked out fine apparently.

I'm at a dead end now as tried everything I can think of.... Thanks for any help in advance.

sohc_mshue

Can you get a scope reading of the cam and crank signals at the ecu?

wadzii

cam sensor should not have any voltage when the engine is not turning.

Unplug the cam sensor, then check for voltage at the pins on the ecu, if you still have voltage disconnect the firewall connector, if you still have voltage pull the pins from the ems and check there, if you have voltage at the ems with no wires attached to the cam sensor pins then you have something inside the ecu fried.

you can also log cam-crank, cam tooth period, t2per, etc to see what the ems is seeing on the cam line.

but if you have 12v at the cam sensor something is wrong, the mag cam sensor generates its own voltage, it should have only a ground and a signal.

do you have that 12v at the sensor with the aem unplugged?

Rob@ReidyRacing

12v coming out of those pins on the ecu too.


No voltage when the ecu is unplugged.

Sending it back to AEM for the second time now...

wadzii

do you have another car to plug it into?

Rob@ReidyRacing

Yes tried that now and ecu is definitely at fault. Back to AEM it goes for the second time.

wadzii

test it on another car before you put it back in the problem car. problem car could be frying things.

Had it happen more than once.

JV-s2

any update on issue? i'm having same problem. Thanks advance