dear all,

just been set up as forum user.
Here my point of view on this subject.
Like Etharp stated, is could be related to the accelerator itself. Would like to add some to this. This (Janpanese manufactured) accelerator was introduced in 1996 and proven to be a very reliable component. What has been seen in the field is that a pin in the 4-pin connector of the main harness connection to this accelerator could be pushed back in the connector. Mechanics tend to pull the wire to disconnect this accelerator when removing the floorplate since this is a very tight fit connectorand resulting in intermitting contact. During operating the truck it could generate the code 51. Truck stops, recycle the key-switch and drive off again.

Secondly, the yellow multi pin connector in the main truck logic card (located on top of the control panel in the counterweight) is often pulled out by depressing the mini lock pin and pulling the wires! Also a reason for a pin being pulled out of the connector making intermitting contact.

Hope this helps.
Regards, Hans.