98 V70 XC died on the road, no start.

von_braun · Post by **von_braun** » 16 Mar 2010, 10:29

First off just wanted to say how awesome this site is and how much its helped me with my Volvo troubles.

So I was driving along and all of a sudden my xc just dies like it ran out of gas, and continues to not start.
Check the fuel pump relay, its fine, and there's pressure at the fuel rail.
Pulled out my ODBII scanner and gave me 3 new error codes.
Camshaft position sensor signal
Front knock sensor signal
Front heated 02 sensor signal
Since ive read here the engine wont run without the camshaft P. sensor I assume that was the cause, but I cant really afford to replace all the sensors right now.
Any ideas on how I should tackle this?
Can I just replace them one at a time as i can afford it?
Thanks in advance. VB

Post by **jblackburn** » 16 Mar 2010, 11:04

If you've got a code for the camshaft position sensor, it's definitely dead, and your car won't start without it, since it doesn't know when to tell the ignition system when to fire the plugs.

You can usually find used ones on Ebay, or scout around at a junkyard. One from any 93-98 850 or S/V70 will work in your car. I want to say that later ones are a different part.

Knock sensor...what kind of gas have you been using in it? Your car is a turbo, you should be using only 89 or higher octane gas...87 is bad for these engines.

What code did you get specifically for the O2 sensor? P0130, P0131, or P0132? The latter two are often caused by cracked vacuum lines or the introduction of un-metered air into the system, causing the O2 sensor to over-compensate. These are a much cheaper solution to replacing the oxygen sensor, but just a bit time-consuming.

nateairman · Post by **nateairman** » 16 Mar 2010, 14:12

Def. the camshaft sensor. I had an intermittant one and it was causing a miss fire at higher rpms. Good luck finding a used one!

von_braun · Post by **von_braun** » 19 Mar 2010, 07:27

Thanks for the confirmation guys.
I just ordered new over a used, the only junk yard around doesnt have any volvos on the lot.

Im not sure right now what specific O2 sensor code it gave me, EFI-xxx, I use FCR. Any other good pc based ODBII programs?

Post by **jblackburn** » 19 Mar 2010, 07:31

I'd say start with the cam sensor for now, clear the codes, and see what comes back. Try running higher-octane gas if you haven't been and the knock sensor one hopefully won't come back. If that does, it'll need to be replaced or your engine won't run to its full potential.

As for the O2 sensor, have a look at vacuum lines, since that's the most common cause of false codes to be thrown for them.

von_braun · Post by **von_braun** » 21 Mar 2010, 11:51

Ok this is frustrating. I replaced the Camshaft Position sensor. Tried starting the car and it wouldn't start. Behaved the same way as before, so I cleared the codes and scanned again and its still giving me the Camshaft Position sensor signal error! Am I looking at some sort of cable shortage or bad plug? Im going to try contact cleaner it any other ideas would be helpful.

von_braun · Post by **von_braun** » 21 Mar 2010, 16:16

Ok Ive cleaned both ends of the CPS and the receiving plug to no avail. Still gives me error 314.
What could I possibly do about this?

Post by **jblackburn** » 21 Mar 2010, 18:21

Hmmmmmmmmmm

What kind of sensor did you replace it with? It wasn't an aftermarket one you picked up at an auto parts store, was it?

This is a similar thread - if you have to start testing continuity on the leads, which would probably be your next step if you DID use an OEM sensor, I can get you the pin-outs from the ECU to check the wires. Just let me know.

von_braun · Post by **von_braun** » 21 Mar 2010, 18:59

No its a Bosch I got from Eeuroparts.com, looks damn near identical. Ive read around the forums about testing the sensors with ohm meters, new one gave about 14Ω on one set of pins and 6Ω on another set and O.L on all other combinations. What kinda figures should I be getting?

Post by **jblackburn** » 21 Mar 2010, 19:10

Ok, good. Aftermarket parts are evil! And whoops, totally forgot to post the link in my earlier post:

https://www.matthewsvolvosite.com/forums ... 10#p123810

Pin 1 of the sensor is ground and should ohm out 0 to ground. Pin 3 to pin 1 should show the battery voltage. Pin 2 to pin 1 should show less than 5V.

My computer for some reason at the moment isn't opening VADIS, but these are the pin-outs for my S70, which should be the same.

ECU.pdf: (64.14 KiB) Downloaded 217 times

You will want to ohm-out wires A21 and A36 to the wiring at the camshaft sensor itself.