GP life varies with use. My wife's '06 has 110k miles on the original plugs. But, in southern AZ, coupled with the fact the she gets to drive a garaged car, the GP's don't cycle on very long.Ok so what is life of the glow plugs?
Not quite...So pull the harness off the glow plugs, take the plug out? Just put the meter on each end?. I guess I should look at it but it is like-15 out there
ok so everything is where it should be, thats good.Your relay/fuse panel looks like the '98 that's posted at the beginning.
Keep in mind that VW, like others, will make mid year changes. So, the fact that your panel does not exactly match is not too big of an issue. It could be that someone rearranged the relays above the panel, too. You never know.
Should be...So just to clarify, the relay that is numbered 180 is the glow plug relay right, and the numbered 50 fuse with the huge wires coming out of it is the glow plug fuse right?
K, I am used to vortex where they hunt you down and stone you if you start a thread...Should be...
I've seen a couple different posts. What is your issue? No cold weather start? Long cranking cold start?
You will want to start your own thread...you'll get more specific attention and will be easier to follow YOUR troubleshooting.
The light is driven by the ECU. One hopes that the glow plugs are also on through their separate fused circuit, but there is no reason to presume that the cluster illumination is a certain indication of electrical power to any of the glow plugs.
The temperature sender is two units in one housing. One sender drives the gauge in the cluster, the other, the ECU. The ECU half may have failed, but can't be replaced separately.
A constant 20 second duration, regardless of air temperature or engine temperature, indicates that the ECU doesn't know the temperature and defaults to maximum cold values.
Check with VCDS, and check the wiring back to the ECU, too. Twenty seconds indicates an open circuit (bad connection, bad sender, bad wiring).
Down to ~40F, mine only comes on for 1-2 seconds. Down to ~30F, mine comes on for ~5 seconds. <30F and it comes on for 5-10 seconds. These are approximate times....BUT the GP light on the dash only stays on for 1-2 seconds. . . .on my MK4, same outside temp, it would glow for 5-10 sec. . .longer anyway.
Wire it to the glow plug relay instead of the "wait at least this long" ECU output.Jon I'm new to the B4 game as you know.
so what causes this: car appears to start right up, even when cold no real issues. BUT the GP light on the dash only stays on for 1-2 seconds. . . .on my MK4, same outside temp, it would glow for 5-10 sec. . .longer anyway.
How do you get the dash light to better reflect actual GP time???
It (yellow lamp) works on a timer and thermometer on my B4 Passat. It is not actually connected with the glow plug circuit.Down to ~40F, mine only comes on for 1-2 seconds. Down to ~30F, mine comes on for ~5 seconds. <30F and it comes on for 5-10 seconds. These are approximate times.
Fundamentally, if the car is starting fine in cold weather, I wouldn't worry too much about the GP light duration.
Feel free to post back any questions or issues.
The ECU controls the yellow lamp, based on temperature and time for pre-glow. Although, even when the lamp turns off, the GP's are on.It (yellow lamp) works on a timer and thermometer on my B4 Passat. It is not actually connected with the glow plug circuit.
Check post# 95-98 in this sticky to make sure you don't have this issue that I had on my wagon. If you unlatch the fuse/relay panel and lower it down, you can acces that fuse against the firewall (behind/above the ratsnest of wires) to the left of the clutch If I recall. It does still require the dexterity of a contortionist though.I have just replaced the 180 gp relay on my B4. After much shivering and cursing, outside in the winter. I had to yank and wiggle and it finally came down still plugged in, where I could replace it.
NOW HOW DO I REPLACE THE FUSE? It's up behind the fuses and the rat's nest behind it, hard against the firewall. It has a black plastic tab pointing against me. I would have to pull that tab towards me, while pulling the fuse out with some combination of my remaining fingers on the one arm. All by feel, can only get one arm in there, with my cheek against the dashboard, so I can't see what I'm doing. Suggestions?
Update it is an 80A (32V) fuse.