Could someone tell me what this part's function is?
Thanks.

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So many donuts, so little time.

I'm sure tmannian knows this but squeak may not.

The start inhibitor will be present on automatic transmission cars. With the jumper, as pictured, is what you will find on manual trans cars.

In any event, it will not have anything to do with your idle problem (mentioned in your other post).

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'80 DL 2 door, '89 DL Wagon

I'm not so sure the question is answered quite yet.

It would help if the OP posted what manual this is a tiny excerpt from, so we'd have some context. 112 is a generic reference to any program jumper, meaning a configurable connection that depends on diagnostic mode, market, options, etc.

And what page, or what title, and what about the corresponding wiring diagram for which this physical location is given. These detail drawings in the WDM's are famously riddled with mistakes.

The black/black jumpers are not used in the starter circuits of any cars I know of, but in the case of the late production 93, I'm not surprised by anything.

The start inhibitor jumper for manual cars is found just northwest of the shifter at the base of the front console, logically speaking. Not behind the head in the engine compartment.
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Art Benstein near Baltimore

Two cannibals are eating a clown. One says to the other: "Does this taste funny to you?"

So, I spent a little too long looking into this. However, I've found that this is the last page of the LH Manual, so I was wrong before stating that it is for the start inhibitor switch.

So, OPs diagram is on the last page of the book, where the page before has a diagram. Looking at that diagram, there is no connector with black/black.

So, went into the '85 wiring manual, where it does have the SB/SB connector listed.

Trying to figure it out between manuals I find that all the ports the connector should go into should be ground. So, it appears you might be able to use the connector to verify the control unit is still grounded properly.

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If you're not driving it "like its stolen," are you really driving?

That TP31361/1 is the early manual for the debut of LH2.4 for volvo. It looks rushed in many places.

The actual jumpers in the LH2.4 circuitry are cabled with blue wires, but they connect to brown/black at the option pin. I've seen this with my own eyes, but I can't be sure they all are made that way. There's no reason to color code the wire on a jumper plug. It doesn't identify the purpose, as any jumper plug is interchangeable with any other.

The jumper for the starter circuit (for which I have a photo) looks no different from those used to ground pins on the fuel computers for LH2.0, LH2.2, and LH2.4.


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Art Benstein near Baltimore

Deja Moo: The feeling that you've heard this bull before.

Firstly, just wanted to say thank you for all the responses. I had just downloaded a free copy of a green book and was looking at all the diagrams/pretty pictures and such. I hope I didn't waste too much of anyone's time. I've been hunting for the cause of my 93's hunting/high idle. Been suspecting the AMM but when pulled, runs like crap, so I figure it's ok. Cleaned and tested iac, cleaned flame trap, cleaned TB, new O2 sensor, reset ecu and it now seems to be leveling itself off.
Thank you all again. This BB is an invaluable resource!
Rob McHugh
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So many donuts, so little time.

FWIW

those Groton Guys say they've got the Greens on CDrom

http://www.fcpeuro.com/products/volvo-repair-manual-cd-rom-240-260-ot-publications-tp-51952

Art, you are the man..

My assumption was there would only be one #112 for a given wiring diagram. And for the '93 model (this was revealed in a duplicate post on the subject) diagram in Bentley, 112 is listed as "bridge connector" and, of course, there it is in the starter circuitry. So anxious was I to show off I took no notice that neither wire is black. And there is at least one other 112 in the diagram. Also with no black wiring. So, I am humbled.

The only other thing I recognize in the pic is the lift pump and fuel sending unit. So if 214 is LH ECU and 217 is the main relay (unless I'm also wrong there), this would seem to be for the FI system. But you tell me because I am like Sgt. Schultz, here.

OP stated he was having a high idle problem.



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'80 DL 2 door, '89 DL Wagon

OP stated he was having a high idle problem.

Yes, I kinda figure this has nothing to do with idle, and OP suspects that too, but when you find something and you don't know what it does, it never hurts to ask questions.

The black/black jumpers I've seen, physically, were those on the ECU. I remember tracing the pin functions to logic inputs (programmable I/O on the MPU) and then searching SAAB pinouts for LH2.4 to see what Bosch was doing with them -- hoping to stumble on some Easter egg or diagnostic option Volvo decided to keep mum on.

But those physical wiring maps that are on the right side of the two-page titles in the WDMs are not trustworthy. They will guide you to connections that don't exist or do, but on the opposite side of the dash, or as in many cases, objects that should have been removed from the copy-paste of last years' manual. Maybe in this case the 112 is on the wrong side of the firewall?

I like your BMW story better.
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Art Benstein near Baltimore

"Doc, I can't stop singing 'The Green, Green Grass of Home.'" "That sounds like Tom Jones Syndrome." "Is it common?" Well, "It's Not Unusual."

That connector is where the start inhibitor would go, if it were installed. If not, it's just jumped like in the picture.

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If you're not driving it "like its stolen," are you really driving?

Looks like the connection for remote start. You can connect a momentary switch there and "turn the key" while you're troubleshooting under the hood.

If you mean the sketch label 112, it looks like a connector. Maybe for the temp sender for the ECU? My best guess, what is the issue you are having?

Mike