Discussion and technical advice the SW20 MR2. 3S-GTE, 3S-GE, 3S-FE etc
Anything and everything to do with maintenance, modifications and electrical is in here for the Mk2.
Hi all. For about 6 months now the engine check light in the dash has been on / off intermittently and I've no idea as to the cause.
It's never on during the very first few seconds of engine running, and after that it's on roughly 75% of the time and starts to turn off if the engine gets really warm (but not always).
Because it's never on until the engine runs, jumping the pins on the diagnostic port yields no error codes (I assume this can only be done with the engine off?).
Any ideas? Thanks
So to confirm, when you put it in diagnostic mode the engine light just flashes at you at a regular interval, indicating no codes stored?
How is the car running otherwise?
SonicSW20 wrote:So to confirm, when you put it in diagnostic mode the engine light just flashes at you at a regular interval, indicating no codes stored?
How is the car running otherwise?
Hi guys, unfortunately this is still happening
Something I've discovered today though, is it's related to the pump relay. Basically if I start the engine, after idling for 10-20 seconds, just as the engine is almost fully settled, the engine check light will turn on, and at exactly the same time, the fuel pump relay switches (I can feel it click).
Any ideas?
Having the same issue,
Turn ignition on, dash lights up, fuel pump can be heard running, start engine ECU light stays on.
Car seems to drive fine, but have been reluctant to take it out.
It did go out after a 15min drive to work but can back on for the journey home.
Funnily enough I can get the ecu light to flash when using the paper clip diagnostic tool.
What happens if you let it idle in diag mode? I am not sure exactly how the code reading works on an MR2, but perhaps it'll flash something at you if the fault occurs while in this state?
I tried that, basically the engine light flashes constantly at first, and then the light turns solid (matching it turning on when not in diag mode). It doesn't throw up a code
Weirdly if I remove the paperclip with it running and reinsert it again, the engine rpm picks up for a few seconds then bogs right down to 600rpm or so. I guess the diag mode is only for when the engine is off because it seems to mess with the fuel mix or something.
DaveWS wrote:I tried that, basically the engine light flashes constantly at first, and then the light turns solid (matching it turning on when not in diag mode). It doesn't throw up a code
Weirdly if I remove the paperclip with it running and reinsert it again, the engine rpm picks up for a few seconds then bogs right down to 600rpm or so. I guess the diag mode is only for when the engine is off because it seems to mess with the fuel mix or something.
Diag mode is used to set ignition timing, it puts the timing into static mode so a drop in RPM is normal.
Clutching at straws really... Have you removed the ECU and taken the cover off to inspect the board? They're at that age where capacitors fail which can cause all sorts of odd issues.
DaveWS wrote:Yeah if I do the paperclip test it just flashes normally
If I do the paper clip in the port the Light stays lit and doesn't flash at all.
I'm thinking ECU fault.
Might throw a video on YouTube for comparison.