Group 19, Motor Controls
SM 765, Dec ’06 CONTROL TROUBLESHOOTING • 19-3-3
Fault
Code
Fault Name Fault Description Control Troubleshooting
Action
Required
18 "LOGIC
FAILURE #2
Failure in U,V,W
voltage feedback
circuit
MASTER • Fault in the hardware section of the logic
board that manages the phase 's voltage
feedback.
Replace con-
troller
19 "LOGIC
FAILURE #1
An over voltage or
under voltage con-
dition has been
detected
MASTER • This fault signals that the under voltage /
over voltage protection interrupt has
been triggered
• A real under voltage / over voltage key
input (C3) happened. Voltage has been
below 30V
• A real over voltage on the power capaci-
tors happened, voltage has been 115V.
• Fault in the hardware section of the logic
board that manages the over voltage pro-
tection.
• Possible plugging in or unplugging of
battery or charger with the key switch on.
Replace con-
troller
30 "VMN
LOW"
Wrong voltage on
motor power out-
puts; failure in the
power section or
in the mosfet
driver circuit or in
the motor
MASTER • This test is carried out during initial diag-
nosis and in standby. Possible causes
• problem with motor connections or the
motor power circuit; check if the 3
phases are correctly connected; check if
there's chassis ground of the motor to
truck frame.
• A problem with motor connection or
power circuit.
− Check if all 3 phases are correctly
connected.
− Check for short between motor ter-
minal and chassis
− Perform diode test
− unhook battery at controller and do
a diode check between Batt + and
Batt - (should read .3 to .5 volts)
• Diode test
−Disconnect all power and motor leads
from control.
−Select diode test on your multi meter.
−Place positive meter lead on control -
Battery terminal place negative meter
lead on terminals U,V,W meter should
read .3V to .5V if not replace control.
−Place negative meter lead on control +
Battery terminal place positive meter
lead on terminals U,V,W meter should
read .3V to .5V if not replace control.
−If code presist replace control
• Fault in the inverter power section.
Replace con-
troller
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