I have an 8fgu20 that will not display codes with the matching connector or an analyzer. The forks will not lower , forks, engine,and wrench lamps are on. engine runs, forklift goes forward and reverse, sas/ops control box has been rebuilt. How would you diagnose this issue?

Please see this if it helps or you can buy the analyzer as well.

1. Turn the ignition key switch ON (or start the engine).
2. Disconnect the matching connector.
The hour meter indicates "PASS_", the wrench lamp turns on,
and then password display is indicated.
3. While shifting the tilt lever to backward tilt for more than 5
seconds, returning the lever and tilt **** switch after pressing
the switch for more than 2 seconds will indicate "1-dIAG" on
the hour meter.
4. As you press the tilt **** switch for less than 2 seconds, the
diagnosis No. and the error code will be indicated, and each
error code and the time when it occurred will be indicated
alternately every 2 seconds

The maximum number of error codes that can be stored is
10, and as the diagnosis number gets smaller, the error
will be newer.