4WD issues
#1
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Location: Atlanta, GA.
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4WD issues
Wont' go into 4WD sometimes... I replaced the vacuum hoses and still has trouble... electrical guy said he thinks it's an electrical diode in the transfer case that is going out... He's done work on our trucks a lot and has seen it before. I believe him because if I don't use the 4WD for a few days I have the problem, but once i get it going again it's fine. That tells me the connection has warmed up enough to work again. However, this won't last forever.
any thoughts? Is this fixable driveway? I hate electrical so I might just get him to do it!
any thoughts? Is this fixable driveway? I hate electrical so I might just get him to do it!
#2
Contributing Member
Never heard of a diode in the transfer case. There is a switch in the transfer case that detects when you shift into 4wd and that switches a relay which then engages the 4wd vacuum valve to engage the front ADD. The switch should be easy enough to repace.
Read through this for more info
http://www.off-road.com/toyota/tech/add/
Read through this for more info
http://www.off-road.com/toyota/tech/add/
#4
Contributing Member
The switch just screws into the side of the transfer case, I can't remember which side but it should have a connector with 2 wires. Check and see if the connector is tight. To check the switch put the transfer case in 4wd and check for resistance across the terminals. it should be zero ohms, and should be infinite with the shifter in 2wd. Maybe get someone to wiggle the shifter while you're checking the resistance. If the switch is bad just unscrew it and put a new one in.
#5
Wont' go into 4WD sometimes... I replaced the vacuum hoses and still has trouble... electrical guy said he thinks it's an electrical diode in the transfer case that is going out... He's done work on our trucks a lot and has seen it before. I believe him because if I don't use the 4WD for a few days I have the problem, but once i get it going again it's fine. That tells me the connection has warmed up enough to work again. However, this won't last forever.
any thoughts? Is this fixable driveway? I hate electrical so I might just get him to do it!
any thoughts? Is this fixable driveway? I hate electrical so I might just get him to do it!
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