Jump to content

Locate Octavia Glow Plug Relay


Recommended Posts

I am trying to find where the glow plug relay is on a 2003/2004 skoda octavia - any ideas?

My problem is that the glow plug light comes on but goes off after a second even when the engine is cold. I have replaced the glow plugs and would like to try replacing the relay also.

Thanks

Paul.

Link to comment
Share on other sites

Assuming it's a mkI you need to remove the trim that is directly above the pedals on the underside of the dashboard, then if you look up into the dash you will see a number of relays - the glowplug relay should have 109 printed on it and it's probably grey. You should be able to reach up and remove it, note which way round it is fitted and replace with a new one.

Could also be a probelm with the coolant temperature sensor. Also at the moment it is nowhere near cold enough to make the glow plugs come on. You could try unplugging the CTS and see if the glow plug light stays on (should be about 20 secs with the CTS unplugged).

Link to comment
Share on other sites

  • 3 weeks later...
  • 4 weeks later...

Still having difficulty with this issue. I have tried the following;

1. Replaced glow plugs

2. Replaced relay 103 and 109

3. Removed cable from cooland tank

The problem still exists. When I turn the key the glow plug light comes on and goes off after about 2 seconds. It is not heating long enough so starting the car is difficult. Thanks for the help so far. Any more suggestions would be welcomed.

Regards

Paul.

Link to comment
Share on other sites

When you say cold, is it below 5 degC?

If not then the glowplug system should not operate and what you see is normal.

It was below 5C this morning and the glow plug light still went out after 2 secs. If I disconnect the coolant sensor it goes out after 2 secs also.

Link to comment
Share on other sites

Still having difficulty with this issue. I have tried the following;

1. Replaced glow plugs

2. Replaced relay 103 and 109

3. Removed cable from cooland tank

The problem still exists. When I turn the key the glow plug light comes on and goes off after about 2 seconds. It is not heating long enough so starting the car is difficult. Thanks for the help so far. Any more suggestions would be welcomed.

Regards

Paul.

Coolant temp sensor isn't in the header tank, that's the level sensor. The temp sensor is in the coolant hose above the gearbox.

Link to comment
Share on other sites

Coolant temp sensor isn't in the header tank, that's the level sensor. The temp sensor is in the coolant hose above the gearbox.

Sounds difficult to a access. Should I be able to get at this from the engine compartment or should I go at it from underneath.

Link to comment
Share on other sites

  • 2 weeks later...

Still having problems unfortunately.

So far I have replaced the glow plugs, glow plug relay and coolant temperature sensor. The glow plug light still goes out almost immediately when i turn the key. Lots of difficulty starting in the mornings, have to turn key 5 or 6 times to get some heat into plugs.

I did notice that if I remove the cable from the CTS the glow plug light stays on for 10 second or so and car starts fine. Anyone got any ideas?

Thanks to everyone for the help so far.

Paul.

Link to comment
Share on other sites

Take a look inside the plug. Corroded contacts or crud between the contacts will cause the CTS to read high. The two wires go straight back to the ECU, so there isn't much more to check.

What was the actual temperature, when you tried to start the car? Was it below 5decC?

Link to comment
Share on other sites

Im probably betting there is nothing wrong and as yet its just not cold enough for the glow plugs to operate. You dont say what engine it is but tbh the glow plugs dont really do much. I suspect your difficult start is another issue.

Any fault codes?

Link to comment
Share on other sites

  • 2 weeks later...

Still trying to resolve this issue unfortunately. The car is a Type 1U Octavia. I have replaced glow plug relay, glow plugs and coolant temp sensor. Glow plug light just stays on for about 1 second even though temperature is below freezing.

I am getting the following error from the computer

Address 01: Engine

Controller: 038 906 012 HA

Component: 1,9l R4 EDC 0000SG 4922

Coding: 00002

Shop # WSC 31480

17664 - Engine Coolant Temp Sensor (G62): Open or Short to Plus

P1256 - 35-00--

Link to comment
Share on other sites

That means the coolant temp sensor is open circuit or disconnected.

You changed the sensor down the side of the head so I'd make sure the plug is on properly. If it is then the wiring needs to be checked back to the ecu.

Thanks for the reply, Do I just check the cable for wear ant tear of is there a way to check using a multi meter?

Thanks

Paul

Link to comment
Share on other sites

Open short to positive normally indicates a blown fuse or something open circuit.

If it's shorted to earth the wording changes, same with a resistive fault.

TBH, I don't think OP's problem is due to the CTS or glowplugs. My guess is the fault code was logged when the CTS was unplugged as a test. Surely, if it is o/c, the glowplug light would be on for longer than one second.

I started my TDi (AHF) at -1.5degC without waiting for the glowplug light to go off (first cold morning - forgot to wait) and whilst there was a slight hesitation, it only took a second or so.

My guess would be another issue such as fuel pump timing.

Edited by rwbaldwin
Link to comment
Share on other sites

  • 7 years later...
  • 2 months later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Community Partner

×
×
  • Create New...

Important Information

Welcome to BRISKODA. Please note the following important links Terms of Use. We have a comprehensive Privacy Policy. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.