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[2.5v6]

Evening all
Got a slight issue with my car. Stalling at junctions and traffic lights. Checked fault code and was showing crankshaft sensor fault. Replaced sensor and fault code still present/won’t clear. Does anyone have a wiring diagram for the crankshaft sensor circuit so I can confirm if it’s a sensor fault or wiring/ecu fault?

[Nick W]

Try disconnecting the MAF, and see if that helps. It will put the EML on, but that's not a problem.


Reading the codes without the engine running will always return a cranksensor code. But that's for no signal, which you should expect with a stationary engine.

[zirk]

By replacing the sensor did it cure the original fault?, if yes dont worry the Code aill prbablg clear in time.

[2.5v6]

She still runs the same without the MAF sensor I need to no what signal/earthing/live that is coming from the Ecu, car stalls at lights and junction/idle I need to rule out the Ecu

[Doctor Gollum]

What crank sensor did you buy?

[zirk]

Never owned a 2.5, but Idle Control Valve ?

[dave the builder]

Never owned a 2.5, but Idle Control Valve ?

that's what i was thinking
they had EGR valves too 

[2.5v6]

Crank Sensor is ‘Lemark’ brand, EGR valve has been change with a working old one so has the throttle sensor.

[biggriffin]

Crank Sensor is ‘Lemark’ brand, EGR valve has been change with a working old one so has the throttle sensor.

Mmm. Nice new shiney GM one here.
 https://www.omegaowners.com/forum/index.php?topic=144271.0

[2.5v6]

Let me check my numbers!

[Enceladus]

Let me check my numbers!

There are three variants of V6 crank sensor and they are not electrically interchangeable.

The earliest has a connector with square sides. This is GM 90492006 / Opel Kat 62-38-333. The Kat number might be stamped on the head.

Then there are two sensors with oval sides. The first of these is 540Ω. This might be a Delphi part and is GM 90492061 / Opel Kat 62-38-126. This part was apparently only used on 2.5 V6. The Kat number might be stamped on the sensor.

And lastly there is a a 850Ω<>900Ω part. This has a Bosch logo on the sensor. It is GM part 90540743 / Opel Kat 12-34-740. It can also be stamped 9049182 which is a factory only number.. This variant is found on later 2.5&3.0 and all 2.6/3.2. The Bosch part number is 0 261 210 131 and this might be stamped on the head of the sensor from factory. Most V6s have this sensor.

So look carefully at the sensor that came off the car. You want one that matches exactly.

[STEMO]

Let me check my numbers!

There are three variants of V6 crank sensor and they are not electrically interchangeable.

The earliest has a connector with square sides. This is GM 90492006 / Opel Kat 62-38-333. The Kat number might be stamped on the head.

Then there are two sensors with oval sides. The first of these is 540Ω. This might be a Delphi part and is GM 90492061 / Opel Kat 62-38-126. This part was apparently only used on 2.5 V6. The Kat number might be stamped on the sensor.

And lastly there is a a 850Ω<>900Ω part. This has a Bosch logo on the sensor. It is GM part 90540743 / Opel Kat 12-34-740. It can also be stamped 9049182 which is a factory only number.. This variant is found on later 2.5&3.0 and all 2.6/3.2. The Bosch part number is 0 261 210 131 and this might be stamped on the head of the sensor from factory. Most V6s have this sensor.

So look carefully at the sensor that came off the car. You want one that matches exactly.

 

[johnnydog]

Reading the codes without the engine running will always return a cranksensor code. But that's for no signal, which you should expect with a stationary engine.

That's strange. I have used a friends code reader whenever the EML has come on, and never read the codes with the engine running. It throws up the codes for the suspected issue but never a crank sensor code, except for the occasion many years ago when the crank sensor had actually failed.

[Enceladus]

That's right. On the pre facelift 2.5 & 3.0 V6 you get code '31 - No engine RPM signal' if you read the codes before the engine is started.

If the sensor is properly detected as faulty when the engine is running then you might see '19 - Incorrect RPM signal'. I say might because frequently there isn't any code. However stalling at traffic lights etc. is a classic symptom of a failed/failing crank sensor. That said it could be the idle valve. The idle valve can usually be fixed by cleaning the innards with some carb cleaner.

A stuck EGR probably would throw a fault.

[Doctor Gollum]

Crank Sensor is ‘Lemark’ brand, EGR valve has been change with a working old one so has the throttle sensor.

That's why it doesn't work then... Only* ever buy genuine crank shaft sensors from a genuine Vauxhall dealer that you genuinely have to walk in to. And take your reg and chassis number so that there is zero confusion.

* an acceptable alternative is to buy one from someone who has actually, personally done this