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93 ranger 4wd not working
Trying to get 4wd working for a customer. I replaced the tcase motor and no change. Swapped ina. Good switch and control module and still not working. I have no lights on the switches. I checked all electrical have good ground and power to module but module isnt sending 12 volts to switch or tcase motor. I get 4.5v to switch and 6.7v to motor. Same results with either module I have. Not sure where to go from here.
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Welcome to the forum
1993 4x4 wiring below This system was used thru 1994, in 1995 a different system was used and in 2001 another different system, just FYI But the shift motor was the same on all years, FYI Controller was different, good article to read on your 1993 here: https://www.therangerstation.com/tec...is-1994-older/ In that article is this 2. If all the fuses are good, the next step is to run the 4×4 module self diagnostic. The 4×4 module is located behind the driver’s side rear jump seat on super-cab models, but as far as the other locations I don’t really know. This module will have three connectors going to it – one will be a pig tail, the other two will be located on the right side of it (side towards the front of the truck). These two connectors must be removed to diagnose the module. With the key in the off position, remove these two connectors from the module. Next, turn the key on with the engine off. On top of the module is a white rectangular button located next to a red LED….push the button and watch the LED. a. If it flashes, this indicates the module is working properly. Go to step 3. b. If it lights up and stays on, it indicates that the module is likely bad. c. If nothing happens, it means the module is either bad, or has no ground/power. You can get corrosion on under side of engine fuse box, lowing voltage at controller Measure battery voltage, then any wiring test should be the SAME as battery voltage |
Ya thays the article that I followed to diag the truck. Like I said I have 12v to the module. But it's not sending 12 volts to the tcase motor or the switch. That's why we got a replacement module but nothing changed. Including the amount of voltage the module is sending to the switch and motor.
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And you did the push button test?
And module passed The way the system works is fairly straight forward Inside the module are 2 relays, 5 pin, one relay for each motor wire Both relays pass a ground to each motor wire when relays are off, so each motor wire is grounded The controller just needs to activate 1 relay, which cuts the ground and connects to 12v on that 1 wire so shift motor turns clockwise If controller activates other relay then motor turns counter clockwise So test if both motor wires show as Grounds with key on, they should And when you change switch position you should HEAR 1 relay "click" closed I never test the switch wiring but its a 3 wire toggle switch So with OHM meter test if wires are connected, unplug the connector at the controller there are 3 wires white/blue wire orange/blue wire blue wire Should be no connection between all 3 wires in 2WD Push button for 4high white wire should now show 0 ohms(connection) to either the orange or blue wire, but just one Then try 4low opposite wire should now be connected to white wire If you are not getting connections as described above then wires or switch is bad I don't know if this is a Voltage switch, doesn't need to be, could be a Ground switch, i.e. white wire could just be a ground, and if orange and blue wires are not grounded then 2WD, if either IS grounded via white wire then 4high or 4low Or could be a voltage switch, works either way The other 5 wires to shift motor are position wires, controller needs these to "know" where it is, and which way to turn the shift motor when switch is used If the controller doesn't "see" a valid "position" then it wouldn't respond to any switch commands, because its "lost" So with key on controller looks for "position" of shift motor, if it doesn't "see" a valid position it should flash BOTH 4WD lights for a few seconds indicating its "lost" But not always OPEN = no connection between wires SHORT = 0 OHMS so connection between the 2 wires https://cimg3.ibsrv.net/gimg/www.ran...f617227ff5.png |
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