Camshaft Position Sensor Signal Volvo S70 T5 97'

perhss70 · Post by **perhss70** » 13 Mar 2025, 09:51

Hello,

Yesterday, I drove the car for 20mins in the morning to get to my uni and after ~3 or so hours, when i went to leave the car wouldn't start. I crancked it 3-4 times with no avail, let it sit for a minute or so, and then cranked it again and it started with an engine light on. On my way back home i noticed everything was ok(smooth driving and idling) and when i went home i plugged in VOL-FCR and got this:
EFI-314 Camshaft position sensor signal.
I reseted the code and today i did around 4 trips 20min each and no light. I was wondering if this means that the sensor is going bad. Is there a chance my sparkplugs are the problem since when i run LPG on low revs its a bit rough after getting hot.

Please advice on how should I procceed.

Thanks in advance.

Post by **scot850** » 13 Mar 2025, 19:17

Sorry, can't help with the LPG side of things as we don't have them over here. Simply answer is it is possible the cam sensor is failing. However there are more things than that that could be an issue and the can sensor code may just be what the final issue was.

The areas I would check are:

1) Fuel pump relay
2) Cam position sensor wiring and connector. make sure the cam sensor and crank sensor wires are kept as far away from the distributor as possible. If they are moved too close to the distributor it can cause the cam and crank sensor signal to be lost.
3) Check the connector for the cam sensor for corrosion.

Otherwise it is a case of waiting until it happens again, or replacing it to be sure. If it is the original it may be it is just starting to fail.

Neil.

perhss70 · Post by **perhss70** » 14 Mar 2025, 12:41

It happened again today. I don't know if it was a good idea but I drove around 150km to my city anyway. Found a used sensor and changed it while also checking wiring. Wiring is pretty bad (the outer black plastics start to crumble) but as far as the wiring goes it seems fine. Is it viable and (relatively straight forward) to make a wiring rehaul? (I have basic electrical education) but mostly house wiring etc. Regarding the sensor
I will keep you updated

Perhs