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Old 19-11-2019   #16
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Re: Grande turns over but wont start

Crank sensor tells the ECU when the reference cylinder (1) is @ TDC (top dead center) and the CAM sensor tells WHICH one (1 or 4) is @ end of compression stroke (vs end of exhaust), if it misses one of the signals it won't fire the coil...

BRs, Bernie

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Old 19-11-2019   #17
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Re: Grande turns over but wont start

As I remember from materials (I dont know yet if it was for Renault) that when ECU doesnt receive signal from camshaft position sensor, ECU will use some dafault value when it expect that timing is done good...so it was able to crank only with signal from crankshaft sensor. This is just for info, I didnt try to disconnect cam sensor and try crank on Punto
+ if car has VVT, cam sensor gives camshaft angle data for ECU and ECU compares this data with default map , based on cam angle vs rpm. If VVT timing doesnt correspondent to default map (+ - some %), it will turn on engine icon. But this was for Renault VVT system
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Last edited by Rado77; 19-11-2019 at 21:05.
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Old 22-11-2019   #18
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Re: Grande turns over but wont start

Thanks for help guys. Camshaft sensor arrived this morning, I replaced and still no luck. I have checked continuity of the 3 cables that feed it back to ECU and all good.
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