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Spedo & lockup conv.

Ethan

Well-known member
Joined
Jul 14, 2001
Messages
68
Location
Elgin Tx. USA
Corvette
1991 L98 Coupe
Does anyone have a diagram showing what color wires go to which pin on the lockup converter plug. When the car is not running I can manualy turn the vss out of the tranny and get a speed reading but running and going down the road no reading.Im thinking maybe the wires are crossed somehow in the converter plug and the wrong signal is going to the wrong place.Seems to me the vss goes through the lockup converter and the to the spedo?Oh and looks like the gear is good in the tranny and contacting the vss.
 

vigman

Motor head!!!!
Joined
Feb 13, 2001
Messages
3,471
Location
Valencia, CA,USA
Corvette
88 Convert ( SOLD ) /1973 coupe 4 speed/1964 Vert!
Bit's of info

The VSS colors are yellow & purple to pins D-12 ( yellow) Speed Input
D 1 ( Purple ) sensor gnd

On the ECM

The torque Converter clutch control

Is Tan /Black
B-2 on ECM Pin D on the tranny soloniod coil.

B-14 on ECM Light Blue Pin B
4th gear signal to ECM

B-19 on ECM Dk Grn Pin C
3 rd gear signalto ECM

B-20 on ECM White Pin E
2nd gear signal to ECM


Pin A is 12 volts VIA brake switch
SO if you apply brake you should unlock


Hope this helps 1993 info
 

vigman

Motor head!!!!
Joined
Feb 13, 2001
Messages
3,471
Location
Valencia, CA,USA
Corvette
88 Convert ( SOLD ) /1973 coupe 4 speed/1964 Vert!
More info

So you have a 5 pin connector that controls the "lockup function" or TCC solenoid. and you have the 2 pin VSS shaft encoder.

The TCC & VSS are seperate circuts.

So if you spin the VSS and get a reading on the speedo.... that kinda excludes the wiring.

It might be the gear on the tranny internal shaft which is broke. or am I missing something?

If you get the rear end of the car in the air.
Pull the VSS turn the tail shaft, can you look in in the VSS hole and see the tail shaft gear move?

That gear is replaceable and has a cheepo clip holdin it in.


Vig!
 

spyysee

Well-known member
Joined
Jun 15, 2002
Messages
124
Location
NY LI Metro
Corvette
1987 black beauty, all ez mods, owned '62,'78
When I had my tranny overhauled. I had the lock up dis connected.
Who needs it anyway.
 

Ethan

Well-known member
Joined
Jul 14, 2001
Messages
68
Location
Elgin Tx. USA
Corvette
1991 L98 Coupe
reply to vigman

Ok Heres the deal. The spedo never worked since I bought the car. Heres the kicker I just now fixed spedo. Bought new vss sensor and installed looked exactly the same as old one. Finally after taking it out numerous times and reinstalling was studying it drinking a cold Bud and relaxing after a hard day of wrenching I noticed it has a offset! Whalaa! The old one was installed wrong to . So heres what ya got to do it comes with bracket installed from GM but its on the wrong side flip it 180 degrees this puts the offset up against the gear. The converter plug only has three wires still need to figure this one out to.I dont think the wires are in the plug correct Thanks very much for input.
 

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