Factory Cat MINI-MAG SERIES Service Manual page 120

13
CENTRAL COMMAND CONTROLLER
YES
back probe terminal #7 on the 14 pin
positive probe and place the negative
REPLACE THE
NO
CONTROLLER
between this terminal and the center
NO
between 4.7 and
Repair the wiring between the
controller and the red wire going
to the potentiometer
13-42
MiniMAG – TRACTION DRIVE w/CCII
SOLUTION POTENTIOMETER DIAGNOSIS
While it's disconnected,
measure the voltage at the
orange wire that was
connected to the center
terminal of the potentiometer.
Was
there between
0.8 and 2.7
volts?
With a voltmeter set to the DC scale
Molex on the controller with the
probe on the negative buss bar &
with the machine turned on.
Was
there between
0.8 and 2.6
volts?
Repair the break in the wiring
terminal of the potentiometer.
Was there
5.2 volts?
YES
2 of 3
Was there a
smooth sweeping
YES
voltage from 0 to 5
volts?
NO
With a voltmeter
set to the DC scale
measure from the
negative battery
cable to the red
wire going to the
potentiometer.
Was
there between
4.7 & 5.2
volts?
NO
With a voltmeter set to the DC scale
back probe between terminal #12 on
the 14 pin Molex connector at the
controller and the negative buss bar
with the machine turned on.
Repair the wiring between the
controller and the black wire
going to the potentiometer
FROM
PAGE 1
"A"
With a voltmeter
set to the DC scale
measure from the
YES black wire to the
potentiometer & the
red wire going to
the potentiometer.
Was there
between 4.7 &
5.2 volts?
With a voltmeter set to the DC scale
back probe between terminal #13 on
the 20 pin Molex connector at the
controller and the negative buss bar
with the machine turned on.
Was there
between 4.7 &
5.2 volts?
Mini-Mag Service Manual V1.0
Replace the
potentiometer
REPLACE THE
CONTROLLER