Clark GEX20 - Page 156

Group 19, Motor Controls
19-3-6 • CONTROL TROUBLESHOOTING SM 765, Dec ’06
Fault
Code
Fault Name Fault Description Control Troubleshooting
Action
Required
74 "DRIVER
SHORTED"
Line contactor coil
driver is shorted
MASTER • When the key is turned ON, the micro-
processor checks that the line contactor
coil driver is not shorted
• If it is, this fault is signaled.
• Check if there is an external short or low
impedance pull-down between NLC
(C26) and -Batt.
• If no external causes can be found.
Replace con-
troller
75 "CONTAC-
TOR
DRIVER"
Line contactor coil
driver is open (not
able to drive the
coil to the correct
voltage)
MASTER • When the initial diagnosis is finished, the
traction logic closes the line contactor
and checks the voltage drain of the
driver.
• If this is not low, the driver is unable to
close and the fault is signaled.
Replace con-
troller
76 "COIL
SHORTED"
Init: Line contac-
tor coil driver pro-
tection circuit is
damaged or Stby
or running: short
on line contactor
MASTER
• When the key is turned on, the micropro-
cessor checks that the line contactor coil
driver short circuit protection hardware If
it does not react in a correct way to the
microprocessor stimulus, the fault is sig-
naled.
• When the fault occurs while the line con-
tactor is closed this, indicates a short cir-
cuit across the line contactor coil. check
if there is an external short circuit and if
the ohmic value (xxx Omhs) of the line
contactor coil is correct
Replace contac-
tor coil
77 "MAINTE-
NANCE
HOURS"
Displayed when
the normal hour
meter exceeds the
maintenance
hours set for the
vehicle
MASTER • This is just an indication that the vehicle
is due for its Periodic Maintenance.