My Father has a R reg SLXi which will start from cold without issue, it will start when hot if it's with in a short period of stopping, but will not start when warm - it turns over but doesn't attempt to fire.

 

I can't recall the codes that were read out, but the garage & Skoda were pretty certain it was a dead temp sensor, so that has been replaced but hasn't resolved the problem.

 

The codes were cleared at the time, so I hope to get the codes read again today, but mean time anyone got any thoughts?

 

 

Thanks

 

Tom

Edited 5 February, 201511 yr by tomsimmons

Was the temp sensor a genuine VAG part?

Yes.

 

Seems that within 20 mins of turning off it will start, otherwise you have to wait an hour to an hour half or more.

 

Tom

Edited 5 February, 201511 yr by tomsimmons

You need to get it plugged into VCDS to look at the temp the ECU is getting from the CTS, & also check the timing/synchro angle. If it's been a while since the timing belt was last changed the timing has probably drifted out.

Have a look here to see if there's a member near you who can help. http://www.briskoda.net/forums/topic/224376-vcds-owners-map/

You need to get it plugged into VCDS to look at the temp the ECU is getting from the CTS, & also check the timing/synchro angle. If it's been a while since the timing belt was last changed the timing has probably drifted out.

Have a look here to see if there's a member near you who can help. http://www.briskoda.net/forums/topic/224376-vcds-owners-map/

 

We have the cheapo cable and VCDS lite.

 

I know you can get the temps through that, I can't recall if the timing/synchro angle is there though, does anyone know?

 

The problem is I'm 400 miles from it and talking the parent through it is not going to be easy!

 

 

Regards

 

Tom

Edited 5 February, 201511 yr by tomsimmons

Finally got the code...

 

Saturday, 07 February 2015, 11:34:40.

VCDS-Lite Version: Release 1.2

Control Module Part Number: 06A 906 018 DJ

  Component and/or Version: 1,8l R4/5V  MOTR HS V01

           Software Coding: 04000

            Work Shop Code: WSC 31480

                      VCID: 6DAD4AB73489

1 Fault Found:

16706 -  Engine Speed Sensor (G28): No Signal

        P0322 - 35-10 -   - - Intermittent

 

 

From what I have read, this is used in conjunction with sensor G40 (crank ?) for timing.  So I can only assume that when cold the ECU uses a default setting, when hot it uses the last used reading, when more than a certain time after the last run it need G40 and G28 to calculate it and because G28 is duff it can't.

 

I have found very little on G28, but it looks like it is part No. 06A 906 433 L, though when you google this part it is usually refered to as the crank sensor, which is what I believe G40 is?  Very confusing.

 

Can anyone confirm this is the right part?

 

Also, from what I have read it is behind the oil filter, can be change in about 30 minutes and it is possible to do it without removing the oil filter?

 

 

Thanks

 

Tom

Sure it's the cam sensor that you need as failure causes hot start issues. I'll see if I can find a part number for you.

Ok the crank sensor part no is 06A 906 433. There are several post fix letter revisions listed.

If you know your engine code that may help me find the speed/impulse sensor part no.

According to Ross-Tech it is the crank sensor that's the problem.http://wiki.ross-tech.com/wiki/index.php/16706/P0322/000802

It's rather confusing.

G28 is referred as the engine speed sensor, I have seen else where that G40 is the crank sensor and that they are used I conjunction for timing calculations.

When you search for a part number for G28 you get the one that you have found, which is always labelled as the crank speed sensor.

According to Ross-Tech it is the crank sensor that's the problem.http://wiki.ross-tech.com/wiki/index.php/16706/P0322/000802

 

Not trying to be picky but to just to get a better understanding. What Ross-Tech says is

• The Engine Speed Sensor (G28) is also used as a reference sensor for the crankshaft position.

  My understanding of the workings of these things is the speed reference is needed to get a ball-park position in a phase locked loop in order to compare the output of the actual crankshaft position sensor (i.e. phase position) with the required position. If that is the case you need both speed and phase sensors.

I can see what you mean.  I wasn't aware of the actual working, but it ties in with what I suspected, it needs both G28 and G40.

 

I guess the question really is, is G28 part No 06A 906 433, which everywhere you look to buy one is called a crank sensor?

 

The car is old, it's worth probably a few hundred quid at best, so buying one of these brand new at around £80 and paying for it to be fitted at lets say £40 and then finding that it's not the cause of the problem, or it's the wrong sensor or... culminates in 25% or so of the value of the car.

 

If this part number is the correct one for G28, then I'm leaning towards an eBay job at around £10-15 and see if that'll do it.

Did you solve this in the end?

What did you do that worked?

Late follow up I know...

 

It was the G28