Join Date: Jul 2007
Location: New Zealand
The difference is that without the cam sensor, the ECU must fire all the fuel injectors simultaneously (continuous injection). With the cam sensor, the ECU fires the injector for the cylinder that is on the induction stroke (sequential injection), leading to benefits in smooth running and fuel efficiency.
So how does the ECU know when the cam sensor is faulty? There are two possibilities. One is that it is an open circuit or a short circuit, due to a poor connection or chafed wiring (which is what the fault description suggests). You should be able to sort this out without the exhaust cam pulley having to come off. The other possibility is that the signal might not be commensurate with the crankshaft position; in other words, the exhaust cam timing might be off.
'00 GTV V6, '08 FIAT 500, shell and parts for a '71 FIAT 850 Coupe
Last edited by alexGS; 27-05-12 at 14:08.