Real Time Help -- Power to VSV

[bogus one]

I've searched, and I've checked the conductivity of the connections to the VSV.

My question:
With power to the harness side connector, I only get conductivity to one of 3 of the negative terminals. Is this correct?

 

[bsmith123]

what year

what year are you working on?

 

[Pin_Head]

Which VSV?

What do you mean "conductivity"? Between where and where? Are you measuring ohms or volts? What color are the wires you are measuring from?

 

[bogus one]

The FSM shows the center top conductor in the connection as the +
When I have the ignition "powered", and my ohm meter positive lead on the "hot terminal", I only get a reading on one of the three negative terminals.

This is the harness side of the connection.

I only know of 1 VSV on a '78 pig

Am I an idiot?

Probably............................

 

[Pin_Head]

Yes, there is only one on a '78; more on 79s.
The schematic indicates that there are 5 wires that connect to the VSV; 1 hot and 4 control wires. It is quite possible that only 1 of the control wires would be grounded (eg. "continuity") with the engine not running. What are you trying to fix or accomplish?

Measuring ohms on a powered circuit isn't particularly meaningful in terms of the ohm reading, but it will tell you if there is a circuit.

The schematic diagram is here.
http://www.yankeetoys.org/documents/wiring_diagram_78_fj40.pdf
It would help to know what you are doing and what wires you are talking about. The black wire with yellow stripe is the power feed.

 

[keikoroo]

Yes, there is only one on a '78; more on 79s.
The schematic indicates that there are 5 wires that connect to the VSV; 1 hot and 4 control wires. It is quite possible that only 1 of the control wires would be grounded (eg. "continuity&quot with the engine not running. What are you trying to fix or accomplish?

Measuring ohms on a powered circuit isn't particularly meaningful in terms of the ohm reading, but it will tell you if there is a circuit.

The schematic diagram is here.
http://www.yankeetoys.org/documents/wiring_diagram_78_fj40.pdf
It would help to know what you are doing and what wires you are talking about. The black wire with yellow stripe is the power feed.

Pin-head, would you have the schematic for a '77? Thanks

 

[bogus one]

I'm trying to smog this dog, and going thru everything to make sure it's ok.

The VSV test per the FSM came up fine, just want to make sure it's getting the proper power and/or signals from the computer. I put this rig in the drink years back and want to make sure I haven't screwed anything up. It's been fine for a long time, but now my smog levels are way out of spec.

I'm fearful that I have a major mechanical issue, just starting with the easiest stuff.

 

[Pin_Head]

Pin-head, would you have the schematic for a '77? Thanks

No.

Coolerman might.

 

[Pin_Head]

I'm trying to smog this dog, and going thru everything to make sure it's ok.

.

If the VSV isn't working properly, check the big connector plug at the smog computer. Wiggle it with the key on and listen to hear if any of the VSV solenoids fire. If so, resolder the connector pins at the printed circuit board.

 

[bogus one]

Thanks, Pin_Head,

Unfortunately. I think #2 cylinder is toast. After 2 hours of running, the spark plug is covered with oil. Looks like a full rebuild is in my future.

Dammit

 

[Pin_Head]

Do a compression test first.

 

[bogus one]

already did

# 2 came up at 60

sigh............