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[Killy93]

Hi All,

Bit of a frustrating issue with my Omega, and not sure where to go from here!

I've had the car for a few months and all running well up until last week. Engine management light came on and codes read - Confirmed P0340 and camshaft sensor faulty or circuit open. Car became increasingly hard to start over the next couple of days until eventually would just turn over and not start at all. When it was running the auto changes were quite abrupt, not smooth as before, and car would not seem to rev over 4500-5000 RPM and would not change up as expected.

Replaced the sensor with one from Euro Car Parts and would not run at all. Did some research here and found out that OEM was the way to go! Replaced with a genuine Vauxhall sensor and now car does start however continues to run rough as before. Tested the resistance of the 3 wires from the plug to ECU and one was reading substantially higher than the others. Traced wire back and found a strange connection of 3 wires just at the front of the engine that terminate into one wire that continues to ECU.



This seemed to be the issue with the high impedance, resoldered and that has resolved. Codes again cleared however car still runs rough!

Sensor has been changed and electrical connections all appear fine from the sensor to the ECU but still giving me the code! Searched these forums as much as I can and although a lot of great info can't seem to find anyone with the same issue! Not sure how to proceed from here so any advice greatly received!

Cheers

James

[dave the builder]

Have you done the basics, like reset the DTCs (fault codes), checked the plug wells and plugs ? checked for new DTCs ?

[Killy93]

Have you done the basics, like reset the DTCs (fault codes), checked the plug wells and plugs ? checked for new DTCs ?

Hi Dave,

Apologies didn't mention that, yes all plugs removed and checked - all look good. Wells seem fine too. DTC's reset multiple times, and always P0340 always reappears after the first crank of the engine

[dave the builder]

Just noticed it's a 2.2  If I remember, there are about 3 different cam sensors and other members have had problems in the past
also when was the timing belt replaced ?
someone with more knowledge of the 2.2 will probably advise  soon hopefully 

[Doctor Gollum]

Manual or auto?

Replace the crank sensor with a genuine one from a genuine Vauxhall dealer that you genuinely have to walk in to and report back

[Enceladus]

What was the Vauxhall part number of the genuine camshaft sensor that you bought?
Did it come from a Vauxhall dealer or somewhere else?
Does it have Siemens & 5WK96052 embossed or screen printed onto it?
And please confirm that both the one that failed on the Vaux original have oval ends on the connector. The square sided ends are for an earlier 2.0L

The sensor is three wire. And there isn't normally a three into one joint in the cable that I've noticed. And not soldered, so it sounds like somebody has maybe modified the loom?

[Enceladus]

PS. Forgot to mention this.
Are you sure this is a 2.2 16V. Y22XE or Z22XE?
What year?

I ask because the earliest 2.0L had a cam sensor with a rectangular connector. Later 2.0L have oval ends on the connector and a revised sensor. This revised sensor can be retrofitted to the earlier engine by modifying the harness connector.

This revised sensor is for the 2.0L and not the 2.2L.

[Doctor Gollum]

I pretty much guarantee that the cam sensor is not the problem. The mere presence of the 0340 confirms this.

If the OP had said generic gearbox code, then I would agree that the cam sensor is at fault, but the other symptoms are classic 2.2 crank sensor ones

[Killy93]

Thanks for the replies all!

Old and new sensor are identical - both 3 pin oval plugs, marked GM 90 520 850 and PA66-GF30 on one side and Siemens 5WK9 605 2 on the other.

Car is on a 52 plate so imagine mid 2002 manufacture? Engine code is Z22XE and car is automatic.

Seems to be crank sensor could be the culprit? Will order one up when Vauxhall opens tomorrow.

[Enceladus]

Those are the correct numbers for an original GM cam sensor manufactured by Siemens for the Z22XE engine ECU. So the newest one should work, assuming the wiring is good. I suspect that previously ECP gave you a Delphi intended for a 2.0L and these won't work.

The crank sensor is GM 9148306. Not sure if this part was used on other models so it might be special order from Germany, if it's available at all.

You'd be very unlucky if the crank sensor proves to be the problem, on 2.2 16vs these are normally very reliable. V6 fail at the drop of a hat.

[Doctor Gollum]

Unlike the V6, crank sensor doesn't kill it, but will take a while to start. It also tends NOT to give a crank sensor code.

That picture of the wiring looks pretty standard for the Omega engine loom once the outer casings are removed

[Killy93]

That sorted it, thanks all!

[Doctor Gollum]

Crank sensor? Job jobbed