Which wires go to the lockup and 3-4 solenoid?

[glenmorebuckman]

I put an a4ld in my 88' bronco II back in July because overdrive went out on my other one. The one I put in is out of an 89' Bronco II and worked fine up till yesterday When I put this one in i decided to baby it to make it last. We live in a very hilly area and I never use overdrive unless I'm on a freeway that is good and level and the speed limit is 65 or over , so I've only used overdrive maybe 10 times since July. I even put an extra cooler on to help out. When I drive in regular D I'm turning 2700rpm's at 55 mph but on the way to work this morning I noticed I was turning 3100 at 55 mph. I shifted into overdrive but it didn't go into overdrive. When I'm in the OD position I can let off the gas and the rpm's drop down to 850. When I'm in regular D rpm's usually go up to about 3000 then it feels like the tranny shifts and they drop to 2700 like it's shifting into a 4th gear at or around 55mph. But since this started I don't feel this shift and the rpm's stay at 3100 at 55 MPH. Also when it was working good and I was doing 55 mph and started to approach a steep hill in regular drive, I could tap the brake and it would make it downshift but it doesn't do this now. I want to hook a voltmeter to the wire going to the shift solenoid and the 3-4 solenoid but I don't know which of the 3 wires at the tranny i hook to for each solenoid.The overdrive worked perfect Sunday and all other gears are working great. Does this sound like it could be a bad solenoid and could someone tell me which wires to check? Cansomeone please tell me the correct way to test these solenoids and to check for torque converter lockup?

 

[MrShorty]

If you don't have a wiring diagram, the wiring diagrams in the free vehicle repair guides at www.autozone.com are adequate for this.

I know I've posted specifics before. Basically they share a common 12 V power supply, and the computer acts as a ground side switch. Set up your voltmeter to measure the voltage drop across the solenoid. Then basically just watch for it to change state. The output state EEC-IV test (see my notes on pulling EEC-IV codes in the EEC-IV forum) is a good place to start, to see if you can see the change in state and what it looks like.

 

[glenmorebuckman]

I'm getting code 29 on koeo continuous code. Insufficient input from vehicle speed sensor. Does this mean anything to anybody?

 

[BrooklynBay]

I have a thread on EEC-IV codes. It says that code 29 is a VSS problem. Check the output of your VSS, and the wiring. Sometimes it could be something simple like the plug on the VSS.

 

[glenmorebuckman]

I have a thread on EEC-IV codes. It says that code 29 is a VSS problem. Check the output of your VSS, and the wiring. Sometimes it could be something simple like the plug on the VSS.

Ok, I cleared the codes this morning and drove to work. I checked the cruise control and it isn't working and I know it was when I used the overdrive last. I stopped at Advance Auto and got a new VSS and put it in but it's still not working. I pulled codes when I got home and koeo all came back code 11. Now what? How do I check the output of the plug?

 

[BrooklynBay]

This would be a good time for a break out box. It is possible to do without one, but is more difficult. Disconnect your battery, and EEC-IV wiring harness from the PCM. Locate your VSS plug, and wires. You would need a color coded wiring diagram. AutoZone should have this on their website. Now, unplug your VSS, and put a jumper wire across its contacts. Go back to the EEC-IV connector, and see if you get continuity. If not, you would have to test these wires individually, and not as a pair. This would require running a piece of wire from either the VSS harness, or the PCM harness, and testing it with the opposite side.