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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old January 22nd, 2010, 11:30   #61
Lug_Nut
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Quote:
Originally Posted by savannah996
....i will follow the wire back from the 50 amp fuse on the fire wall, to the fuse box,....

well that is what someone said here, (about the fuse) however when i looked at it the wires didnt look right.
what IS the fuse on the firewall for anyways?
There are two fuses on the firewall.
The large strip fuse on the firewall, visible from under the hood, is the coolant heater fuse.
The fuse on the firewall, but on the INSIDE of the car, barely visible when the fuse and relay block is lowered, is the combustion chamber glow plug fuse.
Because you wrote "follow the wire back ..." I presumed that you meant the one under the hood. Had you written "follow the wire down... I'd have concluded that you had the correct fuse for this problem.
If I mis-interpreted your description of your plan of action, and came to an incorrect conclusion as to which fuse you were describing, I apologize.
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Last edited by Lug_Nut; January 22nd, 2010 at 11:35.
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Old January 22nd, 2010, 16:13   #62
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on the mk3 there are no fuses on the inside of the firewall. and we also do not have coolant heaters. i will look in my bentley on tuesday or wednesday and see what i was talking about. i do however have a 50 amp blade fuse on the top of my fuse box.
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Old January 31st, 2010, 14:49   #63
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Quote:
Originally Posted by savannah996
and we also do not have coolant heaters. i will look in my bentley on tuesday or wednesday and see what i was talking about.
You'll be able to correct the statement in your post, but this quote will be saved for posterity.
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If the quantity of carbonic acid increases in geometric progression,
the augmentation of the temperature will increase nearly in arithmetic progression.

Svante Arrhenius 1896

Cogito ergo soy (I think, therefore: Biodiesel)
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Old January 31st, 2010, 20:37   #64
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Quote:
Originally Posted by Lug_Nut
You'll be able to correct the statement in your post, but this quote will be saved for posterity.
Can't get away with anything around here, can you?
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Old February 1st, 2010, 09:06   #65
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yet you are right, sorry i was ignorant without the bible!!!
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Old February 1st, 2010, 09:09   #66
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now if the bentley would just have the 1Z wiring diagrams i need to diagnose glow plugs and ecu.=fail
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Old February 1st, 2010, 18:28   #67
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1) Need a helper
2) Unplug glow plug harness from the GP's.
3) Unplug the Coolant Temp sensor (fools ECM into thinking the coolant is <30F)
4) Measure voltage at GP harness
5) Have helper turn key to ON
6) You should read 12V at all 4 connectors on harness.

If 12V not present, check for 12V at GP fuse under the dash.

If 12V present, check resistance of each GP.

If ambient temps are <35F GP's should be on (GP light) for about 2+ seconds. If the GP's are not on for long, I would bet the CTS needs to be replaced.

Tony
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Old February 1st, 2010, 18:40   #68
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Quote:
Originally Posted by savannah996
on the mk3 there are no fuses on the inside of the firewall. and we also do not have coolant heaters. i will look in my bentley on tuesday or wednesday and see what i was talking about. i do however have a 50 amp blade fuse on the top of my fuse box.
Check again, unless for some reason VW didn't equip your southern car with coolant heaters... As far as I know every MK3 sold here has them.

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Old February 1st, 2010, 18:44   #69
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check #65 ↑↑↑
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Old February 4th, 2010, 05:49   #70
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Quote:
Originally Posted by savannah996
yet you are right, sorry i was ignorant without the bible!!!
Check #64. We are all fallible.
Quote:
The fuse on the firewall, but on the INSIDE of the car, barely visible when the fuse and relay block is lowered, is the combustion chamber glow plug fuse.
As pointed out, the fuse in the A3 is attached to the top of the relay block, not to the firewall as on the B4.
The B4 Bentley has the glow plug wiring schematics. My 1997 edition of the A3 does not have TDI schematics (not available at the time of printing).
I should have checked before buying that used manual...
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If the quantity of carbonic acid increases in geometric progression,
the augmentation of the temperature will increase nearly in arithmetic progression.

Svante Arrhenius 1896

Cogito ergo soy (I think, therefore: Biodiesel)
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Old February 4th, 2010, 06:55   #71
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Quote:
Originally Posted by Lug_Nut
Check #64. We are all fallible.
As pointed out, the fuse in the A3 is attached to the top of the relay block, not to the firewall as on the B4.



..
correct, (for my A3 1Z)


my bentley for '93-99 A3's does not have 1Z wiring diagrams. when i called bentley they said "oh let me talk to my supervisor" came back and said "the ahu should be the same" haha let hope i dont short anything!!
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Old February 4th, 2010, 14:21   #72
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Quote:
Originally Posted by Lug_Nut
.........
The fuse on the firewall, but on the INSIDE of the car, barely visible when the fuse and relay block is lowered, is the combustion chamber glow plug fuse..........

"barely visible when the fuse and relay block is lowered"

A crucial piece of information, not available till now!!!! I thought I was blind or mad or both, because for the life of me could not find the glow plug fuse. If only I had x-ray vision.
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Old February 4th, 2010, 23:42   #73
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Broke down and bought a new 180 relay from idparts.com Not sure tif that description is for the B4's made in 97, but I wouldn't call the placement of the relay on the firewall. It's crammed way up top almost near the steering column on one of the 4 slots on the bracket that is hard to even see. I had to pop the relay off the bracket just to detach it and then used the socket mounted back on the bracket as something to push on to put the relay back in.

I already scoped out where the relay was last week. It still took me about 15 minutes to do the switch. If my check engine light comes back on, I swear I'm not going to be a happy camper.
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Old February 7th, 2010, 06:26   #74
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update on my issues=

my ecu and glow plug systems are working, there are just open circuits to the lights in the gauge cluster. AND the airbag ecu is not getting power, prolly also unplugged or something. wont be looking into it until monday i think. cant wait to see if its really that simple. my cruise control is not working iether, i think it is also not plugged up, so i will check that when i drop the fuse box also.

my last mpg=42 city.
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Old February 7th, 2010, 13:12   #75
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this thread is a moneysaver. I already burnt money on 97 relay when I have a 96. This solved the prob
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