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Old 05-20-2018, 03:17 PM   #1
durk80
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Default 1991 240 3.1 wiring diagram for ICU to ECU

Hi everyone, I can't seem to find in any of my 3 Volvo books a diagram for both computers on the passenger's side and what each wire goes to.

The ignition module is bosch 0 227 400 169 pink label (is this even the correct part?)

The engine control unit is bosch: 0 280 000 572 maroon label

Thank you everyone's help in advance; I need it!

Last edited by durk80; 05-20-2018 at 03:39 PM..
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Old 05-20-2018, 04:25 PM   #2
bobxyz
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The "Volvo 240 1991.pdf" at volvowiringdiagrams.com has a page for LH2.4 and a page for LH3.1.
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Old 05-20-2018, 08:08 PM   #3
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Quote:
Originally Posted by bobxyz View Post
The "Volvo 240 1991.pdf" at volvowiringdiagrams.com has a page for LH2.4 and a page for LH3.1.
Perfect! That has helped immensely! Now I know what the wires are for

I still would like to know if the ICU 0 227 400 169 pink label should be in a non-egr 3.1 car, if anyone knows, that would be awesome!

The reason why I ask is because the car had several things that were interesting when I bought it: the 02 sensor was welded after the CAT and a wrong ignition coil was installed. I bought a new exhaust manifold to mount the 02 sensor upstream and the correct coil--no change. Wondering if this could be the problem, yet it has been difficult finding much on the computer and EZK combo. Aren't the pink label computers baaad?

Scroll down to page 21 for the 3.1 wiring diagram, if interested:
http://www.volvowiringdiagrams.com/v...240%201991.pdf
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Old 05-26-2018, 02:12 PM   #4
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For the EZK I couldn't find a pin out, so I made my own based on a diagram for the 2.4 in google docs. It is editable by anyone, so feel free to make adjustments or extra commentary if something needs added/ edited/ or deleted.

Thanks!
https://docs.google.com/document/d/1...it?usp=sharing

3.1 version here also editable:

https://docs.google.com/document/d/1...it?usp=sharing
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