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Old thread but I am having kind of the same issue here.
Replaced the Pump controller with a new one and having the C 74 error.
The machine does not have the 4-pin curtis diagnostic connector present between the controllers (should it be essential?). Present are the 16-pin connectors only on the logic side.
When I plug the curtis diagnostic computer, the parameters menu is empty on the pump controller.
the parameters present on the drive controller are
- Module ID = 5
- TX COB =1
- RX COB =1
same as in most BT drive controllers
Machine drives slow.
Any Ideas?
C74 = Data not received - Pump
transistor regulator [A3]
Data from [A3] not received by [A2]
Broken CAN wire
/ Check CAN bus signal cables and connections.[A3, A2]
Restart the truck
C28 = Is normally the red E stop button.
Emergency switch activated [S21]
No voltage supply to Traction transistor regulator [A1].
Harness problem. / Check emergency switch is not depressed.
Check wiring.
I have had the clip on contact on the back of the E stop fail a few times on other BT trucks, short the 2 wires together & see if C28 fault goes.
A2 is the head card & A3 is the lift transistor panel ( one above the traction box )
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