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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 06-26-2016
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Join Date: May 2016
Location: Antelope, CA
Posts: 2
Icon5 Circuit locations

I have a 1994 Ranger XLT 4.0L V6 Vin X. I hooked up my code reader and retrieved 3 codes from memory:
  • 566- 3-4 shift circuit failure; 629- converter clutch solenoid circuit fault or lock-up solenoid circuit failure; 214- cylinder identification circuit failure

I'm not sure of the locations of these items for trouble shooting. Does anyone have a link or graphic showing me where I would find these. Sort of in limbo now, can't get reliable codes until these codes are dealt with. Thanks folks.
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Old 06-26-2016
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On passenger side of transmission there will be a 3 wire plugin.

That's for the TCC(torque converter control) and 3-4 shift control.

There will be 1 wire, of the 3, that will have 12volts when key is ON, usually a Red wire
That voltage goes to/is shared by the TCC solenoid and the 3-4 shift solenoid inside the transmission.
The other 2 wires go to the computer, the computer will Ground TCC wire to activate lock.
Same for 3-4 shift, computer will Ground 3-4 wire to shift to 4th(OD).

So first thing is to check for 12 volts, on that "red" wire, the 12volts comes from the EEC Relay in the engine fuse box, it is spliced to several other wires, EEC relay powers the computer(EEC), fuel injectors and spark system, so if engine starts the EEC relay/fuse is good, if no power at trans "red" wire then broken wire.

Chance of both the TCC and 3-4 solenoid going bad at at the same time is unlikely.
With 3 wire connector unplugged use an OHM meter to test solenoids in the trans.
Hook meter to the "12volt" pin and either of the other pins, you should see 50-500 ohms, if you see NC(no connection) or very high OHMs then solenoid or internal wire is bad.
test both TCC and 3-4 this way.

214 could be an anomaly, clear and see if it comes back.

The 1994 4.0l uses an EDIS-6 module for spark and also cylinder ID, usually located on Rad support, front or back side.
Behind crank pulley is the CKP(crank position) sensor, it connects to EDIS-6 module, CKP signal tells EDIS and computer when #1 is at TDC
If CKP sensor fails engine will not start.

And in Calif only, the '94 4.0l also has a Cam position sensor, this is at the top back of engine, it is used to fine tune fuel injection, it also is used to ID cylinders.
It sits on what looks like a distributor base...............because that is what it is, lol, just no rotor or cap, instead it has the CPS(cam position sensor) sitting on top.

Last edited by RonD; 06-27-2016 at 11:30 AM.
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Old 06-26-2016
Thread Starter
Join Date: May 2016
Location: Antelope, CA
Posts: 2
RonD: Thanks for the detailed information, will certainly make things easier on me. The engine starts, and basically truck runs OK. Just ran the codes to see what might be there since it's a salvage. Never noticed any problem with trany, just a couple of lose bolts on transfer case.
I'll post the results on this fix. Thanks once again!
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