Group 19, Motor Controls
19-3-8 • CONTROL TROUBLESHOOTING SM 765, Dec ’06
Fault
Code
Fault Name Fault Description Control Troubleshooting
Action
Required
82 "ENCODER
ERROR"
Motor speed sen-
sor (encoder) does
not work properly
MASTER • This fault indicates that the frequency
supplied the motor is greater that 20 Hz,
and the signal feedback from the encoder
has a jump higher than 20 Hz in less than
ten milliseconds. This condition clearly
shows a malfunctioning of the encoder
signal.
• Check encoder wiring; if no fault is
found in the wiring it is necessary to
replace the encoder.
• Check voltage on wire #47, should be
approx 12VDC. If not 12VDC unplug
right + left encoders, recheck wire #47
for 12VDC. If 12VDC is present now,
check encoders and encoder wiring for
shorts. If still no 12VDC replace control
84 "STEER
SENSOR
KO"
Steering Potenti-
ometer signal out
of range
MASTER • This fault indicates an out of range steer-
ing potentiometer signal.
• The fault comes up under the following
two conditions:
• The "set Steer 0 pos" (programmed
straight wheel pos) parameter is wrong
(lower than "set steer min) or higher than
"set steer max")
Replace con-
troller
86 "PEDAL
WIRE KO"
Fault in Accelera-
tor negative
(NPOT) Input cir-
cuit.
This fault indi-
cates that accelera-
tor wiring (NPOT
or PPOT) wire is
open.
SLAVE • Check accelerator wiring and connec-
tions for opens
• Check accelerator input voltage using
PcConsole handset in tester mode (volt-
age should range from 2.0 VDC to
approx. 0.30 VDC).
• Check voltage between NPOT (pin C20)
Battery Neg. (pin C12) voltage should be
greater than 0.30 VDC. This voltage
should remain constant all the way
through the pedal stroke.
• Check if controller input NPOT (C20) is
good. Remove pins (C20, C21, C8) from
connector, now connect a 4.7K ohm
resistor between PPOT (C8) and NPOT
(C20) now plug the connector back in,
this will polarize NPOT. Now check volt-
age between (C12) -Batt and (C20)
NPOT the reading should be approx. 0.6
VDC
Repair wiring as
required
If accelerator
voltage is greater
than 2.0 VDC or
less than 0.30
VDC replace
accelerator
If voltage is not
greater than 0.3
VDC proceed to
the next step
If it sill read 0
VDC the control-
ler has a failed
input
If it reads cor-
rectly 0.6 VDC
the problem is in
the accelerator or
the harness
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