Idle Control Module issue (high idle) & cheap fix

[drumbum68]

While in there, those electrolytic capacitors should be changed.

[shagginwagon83]

My idle control unit on my Digijet was causing intermittent starting issues.

I talked to a professor at school and he thinks I could get away with maybe just eliminating the burnt caps and just running wires as the values of those resistors are unknown.

Regardless, Van Cafe sold me one (last year) for $30. Van has never gave me any issues since.

_________________
Brandon
"Jo Ann" - '83.5 Westfalia EJ22e w/Peloquin
Instagram @joannthevan

[OldBlueSyncro]

[bjrogers86auto]

Took my control unit apart and the NTE 185 transistor was fried. Contacted a local guy who works on circuit boards and he's able to repair it for me. He tested the rest of the unit was fine.

Hope to have it back next week and get the IAC valve back in the loop.

Thanks again Samba people!

Brian
_________________
86 Vanagon GL Westfalia 2.1
18 Nissan Frontier Pro 4X
19 Honda Civic Hatchback

A little rudeness and disrespect can elevate a meaningless interaction to a battle of wills and add drama to an otherwise dull day. Calvin and Hobbes.

[yvessergerie]

Does anybody can get the Idle Control Unit electronic sketch for my Vanagon GL 1987?
y

[[email protected]]

I just repaired my ICU from an 86 2.1l
I had 2 Faults:
1) 2000 RPM idle
2) Rough Idling
No burned components
After reverse-engineering the unit, I had a set of schematic diagrams.
With a scope confirmed that the Solenoid Valve was outputting a PWM waveform.
It was just erratic in idle and 2000 rpm.
Twisting the boards whilst idling I was able to exhibit these symptoms.
On the mainboard I re-soldered all the main large components joints. (Connectors, Large Diodes, Large Resistors, Electrolytic Capacitors)
After this, the 2000 rpm issue was gone, but the erratic idle remained. Twisting the 2nd board was able to simulate this fault. Turned out to be the 0.01uF cap inline with the ignition signal. This is a large component, and the joints were dry, Resolderd all caps on this board, and the fault was gone.

I cant find out how to load files on this site, so if someone wants a copy, just mesage me.

[SyncroHead]

[zoti]

[dhaavers]

@ Roger...Can you share a link to Dropbox, or PDF saved in your Google drive, or...???

- Dave
_________________
86 White Wolfsburg Westy Weekender
"The WonderVan"
<EDITED TO PROTECT INNOCENT PIXELS>

[bobhill8]

Hey folks, Roger sent me the files a while ago and I told him I would post them for him. Haven't done it yet, but will get them up here today when I get to work - yes, I actually go to work a couple of days a week, at least for now.

[bobhill8]

OK, testing to see if these links will work. Could someone click on them and see if you have access to the schematics?
EDIT: The links did not work. Public links are a few posts below.

[Jake de Villiers]

[bobhill8]

https://drive.google.com/file/d/1_phf85X-USw12Q39zog2PxEwQQu3U8UT/view?usp=sharing

https://drive.google.com/file/d/1N2UR4Q8PCaDwS940UHxiQZPu8M4moD05/view?usp=sharing

These should work!

[dhaavers]

Those ^^^ are working for me...very nice!

Hearty thanks to Roger & Bob!

- Dave
_________________
86 White Wolfsburg Westy Weekender
"The WonderVan"
<EDITED TO PROTECT INNOCENT PIXELS>

[[email protected]]

Its a bit of a pain that I cant load them as PDF's

[bobhill8]

I turned the schematics into jpegs. Not sure if it's more helpful in this format, but it was easy enough:

All the work was done by Roger - I'm just the Amazon driver.
_________________
1986 Westy
1971 Squareback

[VicVan]

Are you sure you want to share all this intellectual property? I appreciate the sentiment, however some might take advantage of this. You could maybe share it under a creative commons license. https://creativecommons.org/licenses/

Antway, great work. Can't wait for my idle module to go bad so I can buy this
_________________
'90 Little Blue Truck, 2WD auto, FAS GenV 2.0 NA (AVH)

[Vwtechal]

Thank you for the great information. I noticed in the schematic that you said that the terminal 50 was a mystery as the voltage always stays at 0v. That is because it only receives power to this terminal, and ECM terminal 1, when the engine is cranking. Terminal 50 power comes from the ignition switch when the key is in the "start" position.

[[email protected]]

Thanks, not sure why I missed that !!

[tanhis]