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Undercarriage firing up too soon...
- Thread starter GregF
- Start date
ted mcmeekin
Fast and Clean
If it operates on photo eye, check to be sure they are not blocker or dirty.
Ted
Ted
madscientist
Member
one of the photo eyes or wire may be bad (receiver could be sending back a false positive signal). you can also check the amplifier in the j box (i forget the number). sometimes when it is going bad you can get some life out of it by adjusting it down.
lag
Member
I have seen this situation many times. The photo eye system the issue. Fire a wash output y40 comes on then input x20 should come on. when x20 (photo eye input) goes off, then UC comes on.
Turn on y40 in your diagnostic ,then watch input x20 to see if it is coming on and staying on, or if it is flashing.
The amp is located in the J2 box, you may also want to test the strength of the eyes . turn on y40 again, all 3 lights on the amp should come on (if all 3 do not then you have an eye problem). slowly turn down the potentiometer. the relay light shouldn't go out until around 2 .
If an eye is the issue it is usually the receiver (black wire) but in around 20% of the time it is the transmitter (gray wire).
If the eyes test OK try replacing the amp (very unlikely). Their is also a very slim possibility that the signal wire back to the j0 is bad.
Hope this helps some ,Lag
Turn on y40 in your diagnostic ,then watch input x20 to see if it is coming on and staying on, or if it is flashing.
The amp is located in the J2 box, you may also want to test the strength of the eyes . turn on y40 again, all 3 lights on the amp should come on (if all 3 do not then you have an eye problem). slowly turn down the potentiometer. the relay light shouldn't go out until around 2 .
If an eye is the issue it is usually the receiver (black wire) but in around 20% of the time it is the transmitter (gray wire).
If the eyes test OK try replacing the amp (very unlikely). Their is also a very slim possibility that the signal wire back to the j0 is bad.
Hope this helps some ,Lag
Greg, I would say it's the amp. If your in a bind and don't have an extra one, and you have a Unitc with the option that senses the car as it pulls up to it, steal the one inside the Wash Select II and replace the amp in J2. See if that fixes the problem. I just got back in town this evening and got your email.
