'06 Tundra - 4wd won't engage

Chuckster

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Mar 4, 2022
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Make
Toyota
Model
Tundra
Year
2006
Miles
280,000
Engine
4.7
4wd light blinks on dash. I hear the actuator on the transfer case 'whirr' but I hear nothing from the front diff actuator.
Does anyone have a way to test if the actuator is getting a signal to engage, and/or a way to test if the actuator itself is good?
I took the actuator off - plenty of oil and it moves.
All suggestions are appreciated.
 

grcauto

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May 29, 2014
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Get the code.
 

Chuckster

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Mar 4, 2022
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Get what code? The light blinks cuz it's not engaged, not to say there's a code.
 

Chuckster

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I'll get on it tomorrow; thanks for insisting!
Tried twice; once with my little scan tool and then with NAPA's - no codes. called Toyota to see if they would take a quick read for a code - who was I kidding . . ."You'll have to make a service appointment . . ." I guess I need to get in somewhere with a serious scan tool
 

grcauto

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You are not scanning the correct module. Those tools only scan PCM.
Did you test the actuator at all? Easy enough to see if the windings opened.
 

Chuckster

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You are not scanning the correct module. Those tools only scan PCM.
Did you test the actuator at all? Easy enough to see if the windings opened.
Now I feel dumb. What other module and how do I scan it?
 

billr

wrench
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Mar 12, 2007
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It is probably the same module, but you need a scanner that will request and can receive/decode data regarding the transmission.
 

Chuckster

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It is probably the same module, but you need a scanner that will request and can receive/decode data regarding the transmission.
Got it. I'll try a shop or two tomorrow. Thank you; will let you know what I find.
 
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