Hi all,

 

The engine management light has been coming on and going off etc. I've borrowed a mates Proscan V350 ODBII reader and am getting the following results:-

 

• With the light on the scanner reads that no codes are detected, on ignition and with engine running
• The reader allows me to erase all codes resulting in the light going out

 

Its a bit of a puzzle that it says there are no codes but then it erases them, or is that just a reset.

 

I really want to know what is making the light come on.

 

• Does anyone have any experience with this reader?
• Could it be a compatibility/software issue (the car is old 2002)

 

Any help would be appreciated.

 

Norski. 

OBDII is a general standard, it is highly possible that what is bringing on the light falls outside of the OBDII standard and requires a more specialised software to read the fault - i.e VCDS, VCP, OBDeleven etc.

 

Is it the management light or the EPC light?.

Hi Phil,

 

It is the light which is a picture of the engine, I think that is engine management. It is definitely not the EPC light, that goes out as it should.

 

You have said it may be outside standard OBDII. There are a couple of things that I am aware of, dont know if these are relevant:-

 

• Last time the oil and filter was changed the auto center didn't turn the service light out and it has been flashing up on start up for the last 9K
• The oil needs changing now, there is evidence of mayo but no oil in the coolant expansion (condensation?) I've cleared the breather pipe
• The starter motor is noisy on start up, I bought the dry bearing but never got round to fitting it
• Over winter the ABS light was intermittent but that has gone now, it may have been something on one of the sensors

Someone at work told me that one of the lads has got a more advanced reader, he's back from holiday tomorrow so I will ask him to take a look.

 

Does this info give you any ideas?

 

Normski

There are a couple of things it might be - i.e a possible dirty MAF , but without a better quality scan it really would be an educated guess . If you friend's scanner does not pick up any more data, then there is a VCDS users map in the Diagnostic and VCDS forum on here, I'm sure someone would help you out with a scan.

 

The service warning needs resetting, either by proper diagnostic software or by the method that I think is listed in the owners manual, as that may be flagging a fault error to the ecu as well.

 

Hand held scanners and diagnostic software both read from the OBDII data port in the car, the difference is that a basic scanner is quite narrow in the data it will reference, whereas VCDS, VCP, and dealer tools such as ODIS have a much wider area of reference to systems in the car.

 

Hope it helps,

 

Phil.

Thanks for that, I'll see if the lad at works scanner can provide a better picture.

 

Normski

Hi Phil,

 

Hope you can read the results of the scan which are attachments below. The V1 Initial had a number of old codes so that one was cleared, V2 After Clear was with the codes deleted. Looks like it may be the temperature sensors but they were changes last year. I'm going the clean the terminals of the connector as it may be an intermittent fault.

V1 Initial.txt

V2 After Clear.txt

Edited 2 May, 20179 yr by Normski55

http://wiki.ross-tech.com/wiki/index.php/17700/P1292/004754

What is the engine code on your car please? - should be 3 letters like AKL, AEH, AEE etc.

Thanks for the feedback guys,

 

The engine type is a 1.6 petrol 1U5. Is this the part the report is referring too? I changed this last year as well as the sensor on the other side.

 

Normski

1U5 is the body identifier, in the spare wheel well should be a barcode sticker with the 3 letter engine code printed on it.

 

Yes, that is the part that the code refers to. Thermostats on VAG seem to be troublesome if non OE parts are used, did you fit a pattern unit last time?.

Hi Phil,

 

There are a couple of codes similar to the type you mentioned, they are, AMB, AMBI, AVU. I think it might be AVU as this is next to the CN 75KW reference which is what the 1.6 litre petrol is without a turbo.

 

The thermostat was a pattern type from Ebay. If it is at fault it may be possible to get it replaced as it has a 1 year warranty. I assume it is the sensor or the connection that may have failed as the thermostat itself is mechanical (spring type).

 

Normski 

Do you have VCDS?, if so you may want to go through this to check the system - http://workshop-manuals.com/skoda/octavia-mk1/drive_unit/1.6_ltr./75_kw_engine_mechanical_components/engine_cooling/electronically_controlled_cooling_system/testing_electronically_controlled_cooling_system/test_sequence/

 

http://workshop-manuals.com/skoda/octavia-mk1/drive_unit/1.6_ltr./75_kw_engine_mechanical_components/engine_cooling/electronically_controlled_cooling_system/testing_thermostat_for_map-controlled_engine_cooling/test_sequence/

 

Just click the cross at the donate screen, as it is purely voluntary.

 

Pattern parts in this area don't tend to last long without failing fairly quickly - just do a search on here for thermostat regardless of engine type, and see how many people get issues, it will be an eye opener for you.

 

Hope it helps,

 

Phil.

Edited 4 May, 20179 yr by kentphil1

Look on your V5 logbook, the engine serial number will begin with three letters, that is the engine code.

 

+1 on using pattern parts, just don't !! you'll end up replacing twice or more times, get a genuine one from TPS 

Normski, for reference, your engine code is as you thought, AVU.

Thank guys,

 

I will look up the links that Phil recommended.

 

Going back to the thermostat. If it is faulty, is it likely to be the electrical sensor? The car reaches 90 degrees when hot (needle pointing straight up on the gauge), heating and ventilation seems good. I cant imagine its the spring assembly, or am I wrong here?

These engines have a mapped thermostat as well as the conventional mechanical stat, which is essentially a mapped solenoid that allows the engine to warm up quicker. It is this part of the stat that has more than likely failed, as to be fair most pattern stats are built to a price, so something has to give, normally the electrical part of the component.

Hi Phil,

 

Not quite sure I fully understand your last post. Is the solenoid part of the housing that I showed in the image above, or is it housed somewhere else in the engine. The reason I ask is could I just change the electrical sensor? 

It is built into the thermostat body that your photo shows, which is why it requires an electrical connection to the thermostat body, conventional stats do not have this as they are just a housing for the stat itself.

OK Phil, Thanks for the additional explanation and all your help with this one.