318D Boom and Bucket Locked DTC 523217.06

[cj_construction]

As stated in the subject, I have a 318d that will throw a code and lock the boom/bucket hydraulics immediately after starting. It has been sitting for a two months now because I can't figure this thing out. The code comes back to "Hydraulic Valve Power 1 Out of Range High". I have followed the diagnostic procedures in the service manual, which primarily deals with checking the harness for shorts/corrosion, etc. I found some wires that had been chewed by field mice, which is a big problem in our area. I repaired the wires and expected the problem to be fixed but no such luck. I have completed every step in the diagnostic procedures a number of times, which end with "End of Checks". I'm more or less at a loss as to what to do next. I'm leaning toward the problem being one or all of the solenoids but I hate to go throwing $180.00 parts at it. Figured i'd see if anyone else has had a similar problem...

 

[cj_construction]

If the EMU is reading a 'out of range high' voltage and locking the boom/bucket hydros (i'm assuming with the port lock solenoid), does anyone know where it's getting that voltage reading from? I'm seeing 3 solenoids and two proportional valves in the control unit...

 

[Tazza]

If the EMU is reading a 'out of range high' voltage and locking the boom/bucket hydros (i'm assuming with the port lock solenoid), does anyone know where it's getting that voltage reading from? I'm seeing 3 solenoids and two proportional valves in the control unit...

I am thinking the solenoid or even the seat or seat bar sensor.

 

[cj_construction]

I am thinking the solenoid or even the seat or seat bar sensor.

I *think* I've ruled out the lap bar, and seat sensor. The machine will start and run fine, but when the switch is pressed to unlock the hydros it immediately triggers the DTC. The machine will run and move fine but the boom won't lift. I cant get the machine on a trailer with the bucket on and all the way down and I can't get the bucket off the machine (it has always been temperamental)

 

[Tazza]

I *think* I've ruled out the lap bar, and seat sensor. The machine will start and run fine, but when the switch is pressed to unlock the hydros it immediately triggers the DTC. The machine will run and move fine but the boom won't lift. I cant get the machine on a trailer with the bucket on and all the way down and I can't get the bucket off the machine (it has always been temperamental)

Can you remove the lift lock solenoid and check that it magnetizes? Even power it from a 12v battery, see if it unlocks. It may be rated for a lower voltage, so don't keep it powered too long just in case.

 

[cj_construction]

Can you remove the lift lock solenoid and check that it magnetizes? Even power it from a 12v battery, see if it unlocks. It may be rated for a lower voltage, so don't keep it powered too long just in case.

I have tested all 5 solenoids for resistance and all are within spec. I applied 12v to the port lock solenoid, and the boom and bucket lock solenoids, all are clicking and seem to be working. I disconnected the entire harness at the hydraulic control unit (X4 in my screenshot), and started the machine. After unlocking the park brake and hydraulics, I don't get the same code but I get a different one, probably because of none of the solenoids being connected. Still no hydraulics and pedal movement. Next, I connected everything except the port lock solenoid and started the machine. I get no codes, and the pedals will move and the pump will whine as if they are trying to move; infact the bucket curl dump will move the mount a few inches but the boom won't go up or down. I'm guessing because of the port lock solenoid being closed. I am at a total loss with this thing. It only has 700 hours on it and it's sat for months because I can't figure it out.

 

[cj_construction]

I have tested all 5 solenoids for resistance and all are within spec. I applied 12v to the port lock solenoid, and the boom and bucket lock solenoids, all are clicking and seem to be working. I disconnected the entire harness at the hydraulic control unit (X4 in my screenshot), and started the machine. After unlocking the park brake and hydraulics, I don't get the same code but I get a different one, probably because of none of the solenoids being connected. Still no hydraulics and pedal movement. Next, I connected everything except the port lock solenoid and started the machine. I get no codes, and the pedals will move and the pump will whine as if they are trying to move; infact the bucket curl dump will move the mount a few inches but the boom won't go up or down. I'm guessing because of the port lock solenoid being closed. I am at a total loss with this thing. It only has 700 hours on it and it's sat for months because I can't figure it out.

UPDATE- If I apply 12v to the port lock solenoid, the machine works as normal! I'm guessing (and hoping) its just the port lock solenoid on its way out.

 

[Tazza]

UPDATE- If I apply 12v to the port lock solenoid, the machine works as normal! I'm guessing (and hoping) its just the port lock solenoid on its way out.

Hopefully that's the issue. Some times when they warm up they fail, so they work then stop.

 

[farmshop]

Hopefully that's the issue. Some times when they warm up they fail, so they work then stop.

Do you get voltage to the solenoid in question through the harness sounds like a bad wire to me

 

[cj_construction]

Do you get voltage to the solenoid in question through the harness sounds like a bad wire to me

I havn't actually checked voltage at the connector, but i've inspected the harness. Besides that, it seems to me that if it wasn't getting power, or the wire was damaged, disconnecting the solenoid wouldn't change the symptoms, which is does. Unfortunately it will be a week and a half at least before I get the solenoid.

 

[farmshop]

I havn't actually checked voltage at the connector, but i've inspected the harness. Besides that, it seems to me that if it wasn't getting power, or the wire was damaged, disconnecting the solenoid wouldn't change the symptoms, which is does. Unfortunately it will be a week and a half at least before I get the solenoid.

Could be a damaged wire not carrying enough current might have voltage till the loaders of the coil opens the circuit. If applying 12 volts produces a response I would still think wiring issue. A voltage meter or test light would help also if the solenoid is in the ohms range

 

[cj_construction]

Could be a damaged wire not carrying enough current might have voltage till the loaders of the coil opens the circuit. If applying 12 volts produces a response I would still think wiring issue. A voltage meter or test light would help also if the solenoid is in the ohms range

Installed the solenoid today, finally. The old solenoid was seized to the valve mechanism and took forever to get apart. But, in the end, it did fix the issue. The old coil must have been drawing too much current. Thanks for all the help guys. It's easier to stay motivated on an issue if you feel like you have help.