!Help! identifying some plugs and such.

[TacoTuesday94]

I just picked up a 1991 FJ80 and after a little time examining it I found 2 plugs and a hose unplugged. Are they not supposed to be used?

First plug: passenger side of engine bay (left hand drive) connected to igniter.

Second plug: Driver side on top of wheel well.

The hose is front of vehicle, driver side. It connects to this black box thing near the VSV. ( also can someone identify this black box mounted to the fender wall?)

 

[Zjohnsonua]

What color is the wire for the first connector?

 

[TacoTuesday94]

Single black to plug. 2 black out from plug + ground wire. It connects to the ignition igniter.

 

[TacoTuesday94]

Two or so hours of internetting, It look like the first wire is just a Check Connector.

Hose might just be an intake for the silencer?

 

[Zjohnsonua]

good work. Looks like you pinned em down

 

[jonheld]

Two or so hours of internetting, It look like the first wire is just a Check Connector.

And this is why we have factory service manuals for our trucks.
The "CHECK CONNECTOR" is what the FSM calls the diagnostic connector that is mounted on the firewall. The igniter solid black wires should hit 3 points. The CHECK CONNECTOR pin 18 (IG-) to monitor tack signal output, the tachometer input signal, and a noise filter to prevent ignition noise in the system.

The questions you asked, along with all the future questions you will be asking, are all explained in detail in the FSM and EWD. There is no guessing.

 

[TacoTuesday94]

Haha, I was waiting for this comment. I’m hesitant to pull the trigger on a FSM ($$$). I have a pdf of one for a 1994, but obviously the engines are different. My hope was that a kind member might have encountered similar queries and tracked down some answers.

I don’t think the “check conn” is the diagnostic port though since this diagram is specifically for the ignition system. I could definitely be wrong on that though.

 

[jonheld]

Haha, I was waiting for this comment. I’m hesitant to pull the trigger on a FSM ($$$). I have a pdf of one for a 1994, but obviously the engines are different. My hope was that a kind member might have encountered similar queries and tracked down some answers.

I don’t think the “check conn” is the diagnostic port though since this diagram is specifically for the ignition system. I could definitely be wrong on that though.

You are definitely wrong on that. The check connector is the diagnostic port as stated in the FSM.
The 1994 FSM will help with most chassis related items, but will do nothing for engine/transmission/electric.
Not to push my own crap, but I sell a COMPLETE 1991 FJ80 set of manuals in downloadable PDF and JPG format. It is the culmination of 30 years of ownership and is well worth the price of admission.

 

[jonheld]

I don’t think the “check conn” is the diagnostic port though since this diagram is specifically for the ignition system. I could definitely be wrong on that though.

I understand the confusion. You're not reading that part of the schematic correctly. The solid black wire that is labeled "check conn" in that drawing is NOT the actual check connector, but rather the wire from the igniter that runs to the check connector as described in my previous post.
The FSM and EWD specifically call it "check connector". The ONLY place it is labeled as "DIAGNOSTIC" is on the injection molded plastic cover of the check connector.

 

[TacoTuesday94]

Ah I see, I had no idea that was the case. Thank you for the good info. I might take you up on that pdf, I prefer using the search function on my laptop to find things. Do you know what the unused plug I have is for then?