Transfer case control module

Good evening,

I attached a wiring diagram for you to view. It is a 3 wire connector. You should have reference voltage on both the reference and the signal wire from the module.

https://www.2carpros.com/articles/how-to-check-wiring

The return wire is the ground controlled by the module.

Can you verify these voltages?

Roy

I had at the module 5.06 volts for signal wire and 5.06 volts for return signal but when I plugged the harness into module and tested from the end of harness near encoder. I get nothing. When i test same wirers from engine side I had 5.06 volts.

If I try to get volt reading from black/white encoder low reference on harness with dvm - an dvm + on 5 volt reference light green/black and same for dvm + brown/white encoder signal I get .1
But I get the right readings for all other wire on harness using dvm - on encoder low reference black/white an dvm + on other wires. So confused.

Based on your results you need the module.

Roy

Transfer Case Shift Control Module Replacement

Removal Procedure


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1. Disconnect the shift control module electrical connectors.


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2. Unsnap and remove the shift control module from the bracket.

Installation Procedure


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1. If a new control module is being installed, program the new module. Refer to Control Module References in Computer/Integrating Systems. See: Vehicle > Programming and Relearning
2. Install the shift control module to the bracket.


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3. Connect the shift control module electrical connectors.
4. Start the engine and test the automatic transfer case system for proper shift operation.

I tested the module it's okay values are good. But if I reconnect harness and measure at encoder connector female side of harness I'm not getting the right readings from encoder signal, low reference and 5 volt reference. This is where I get on fused. Thinking I need to do a voltage drop test on those three wirers? When I test at connection in engine compartment of same three wire I think coming from module I get correct value.

How did you test the module?

Roy

I did same thing as I did for connection under car but at the module. I did black/white dvm - and lt green/blacck dvm + that gave me 5.6 volts only when I tough dvm- to frame. At module I back probed light green/black and brown/white jumpered together an grounded dvm- to black/white an when I touched between light green/black an brown/white with dvm + I had 5.06 return volt I believe.

The black/white wire is still my concern. The fact you can't use it as a ground still tells me the module is not reading that wire and it should be.

I still feel you need a module.

Roy