bkrahmer
Active member
Now that it's getting cold, my Jetta is not starting well. I started having this problem last spring, and at that point, I checked the resistance on all of the glow plugs, and they were fine. I am not getting a check engine or MIL. I really dug into it today. A couple years back, when the car was under warranty, the glow plug harness was replaced. I have the 4-wire version. I checked the resistance on all four wires at the loom connector, and there were no open circuits. I believe I had the coolant temp sensor disconnected at that point, and when I checked the power side of the 4 pin connector with a test light, I got nothing. I have a '99 Beetle Bentley manual, but not an '03 Jetta manual. I was hoping to find a 180 relay on the relay panel (as on the 99), but the space is empty. I pulled relays one at a time, and the only one that prevented the glow plug indicator light from coming on at all was the 109 power supply relay. When that one is pulled, the engine won't start at all, because I believe it also powers the ECU.
Is this the same relay that powers the glow plugs? Is it possible that part of the relay is bad causing my problem? IIRC, there were five leads on that relay, but I'm not good enough with relays to test it properly.
thanks,
brian
Is this the same relay that powers the glow plugs? Is it possible that part of the relay is bad causing my problem? IIRC, there were five leads on that relay, but I'm not good enough with relays to test it properly.
thanks,
brian