What does the 109 relay do?
Charcoal Cabin Filter (A3)(A4)(B5. Relay 109 is the main power supply relay for A3/B4, and A4 TDIs with the ALH engine. When it fails the engine will crank but not start. Sometimes they fail intermittently.
How do you test a 109 relay?
Simple test remove wire loop from relay, connect one end of wire to terminal 85 of 109 relay. the other end of wire put to ground (so long bit of wire be good) you should hear a click, turn key and see if glow plug light is on and start van.
How do you test a VW glow plug relay?
VW TDI Glow Plug Relay Test
- Disconnect the coolant temperature sensor.
- Turn the ignition to the on position.
- Wait 20 seconds for the glow plug light to turn off.
- Using the VAG 1551, read the fault code. If DTC 00522 appears, the glow plug relay is OK.
What are the symptoms of a bad glow plug relay?
What are the symptoms of a defective glow plug control module?
- White exhaust smoke – a defective glow plug will cause diesel to leak into the exhaust where it burns.
- Hard to start – this could mean the engine is slow to start in warm weather or fails to start in cold weather.
What was the code for the VW Jetta TDI relay 109?
2000 VW Jetta TDI – First it wouldn’t start, turn the key and there’s no glow plug light. Cranks but won’t start. Let it sit for 20 minutes and it started but now it had the CEL on (Check Engine Light). Codes were: P0725, P1857, P1850. Once the CEL was on the transmission went into limp mode giving me 3rd and R. I could manually shift it.
Is there a VW Jetta that won’t start?
VW Jetta TDI – Relay 109 ?? Won’t start! Won’t shift! – YouTube 2000 VW Jetta TDI – First it wouldn’t start, turn the key and there’s no glow plug light. Cranks but won’t start.
What is a relay on a VW Jetta?
VW Power Supply Relays are just a heavy duty switch that allows a little bit of electricity to control something that needs a lot of electricity. This relay is for the Power Supply, and if it fails, it can make the whole car quit just like someone turned off the key.
What is the relay 109 on a beetle?
The relay 109 is the main electrical switch for the car. When it goes bad it won’t allow the car to start. I had this problem exactly with my beetle and it started right up the first time I turned over the key once it was replaced. It will be in a panel between the seat and the pedals towards the door.