CDL questions...

[Mike S]

Yep, I did a search. Did read some useful stuff. Still have a couple questions on how my truck is behaving.

The truck is a '96 FZJ, with diff locks. It has had a number of mods added with attendant circuitry - OBA pump with dash switch, fog, running and back up lights each with a dedicated switch, aux fuel with dash switch. There is no CDL switch installed.

When I start the truck, the ABS light goes on for three seconds (normal), but no CDL light goes on. The F/RR difflock lights go on when the key is first turned, then blink out.

When I start the truck and put it in LO range, it shifts down and runs correctly, but I get no audible or tactile feed back that the CDL is engaged. The CDL light does not come on. The ABS light does not come on.

When I attempt to engage the locking diffs, the lights just flash, and no lock happens.

So I conclude that the CDL is refusing to engage.

The truck is new to me, has 110K and appears to be very well cared for, with exceptional condition. No visble leaks or abuse.

Any advise on what to try before I conclude that repair work is in order?

Thanks.

M

 

[cruiserdan]

Two common possibilities:

The center IS locking but the indicator switch is not sending the signal to the lamp and the ABS.

The center is not locking. Could be the low-4 position switch or a wiring issue.


The diffs will not lock until they see a signal that the center is locked.

 

[Mike S]

Thanks, Dan. Guess I need to get to work on these possibilities. Does the FSM tell me how to diagnose these two possibilities?

M

 

[cruiserdan]

The lock indicator switch is on the front extension housing. If you pull the plug and jump it you should get the CDL and ABS lights. If you jump the connector off of the low 4 position switch on top of the transfer, the center should lock.

Both switches are the same part number. You can also pull the switches and close them to see if they have continuity. If the switchs are good, the center lock motor is not working.

 

[Mike S]

Thanks once again. Just in case I find the actuator motor is the culprit, got a part number for me?

Thanks.

Mike

 

[cruiserdan]

The actuator is a 36410-60050.

 

[Mike S]

Off to the driveway, multimeter and FSM in hand.

Mike

 

[FloridaFJ80]

How much for the actuator motor???

 

[cruiserdan]

A lot.


List is over 700 bucks.

 

[Mike S]

I'm praying that this is a relay, fuse, short... ANYTHING but the actuator...

M

 

[chitown40]

You can also try to remove the switch (tight fit up there) and clean the threads. Also some people have either added or removed washers (I can't recall) because it wasn't properly grounding to the case. I removed mine and cleaned it all off after I was having intermittent problems getting the CDL switch to activate. Once I cleaned the threads off and reinstalled the switch I haven't had any problems. There are a bunch of old threads about troubleshooting the CDL light on here if you feel like digging a bit.

 

[COYS]

Anyone have the Aisin or OEM equivalent part # or link for Toyota 36410-60050? An Aisin version may not even exist as perhaps Toyota used a different supplier? Thanks.