ELECTRICAL 5 - 8
November 2007 GEM Service Manual
DRIVE AND POWER SYSTEM ERROR CODES (Continued)
43 Motor armature offset voltage is too
low.
Replace the motor controller.
44 Armature transistor did not turn off
properly.
Replace the motor controller.
45 Armature transistor did not turn off
properly.
Replace the motor controller.
46 “Look ahead” test for motor
controller A2 voltage is less than
12.5% of battery voltage.
This status code will be displayed if the voltage at A2 is less
than 12.5% of battery voltage and the current is greater than
52 amps when the controller is in the neutral state. This can
be caused by a short circuit from motor armature to the
frame. Test for a short by opening the main disconnect
switch and using an ohmmeter to measure between motor
controller A2 and ground; there should be an open circuit
(greater than 5000 ohms.) If there is a short, check the
wiring, and remove the short. If there is not a short, replace
the motor controller.
49 Motor field current is too low during
the run mode.
This status code will be displayed if the current draw in the
motor field is less than 1.3 amps and the armature current is
greater than 100 amps for more than 1.27 seconds during
the run mode. Check wiring between the motor controller
and the motor field connections (F1 and F2). If the
connections are good, replace the motor controller.
51 Motor controller is not getting 72
volts.
First go through the Drive and Power System
Troubleshooting Chart A. If directed back to the Drive and
Power System Error Code Chart perform the following
procedure. Note: Between each step, if the code appears
the code will need to be cleared. To clear the code turn the
key and Master Disconnect switch (MDS) off for 15 minutes.
Make sure Emergency Brake is on. Turn on MDS and then
the key switch. Did code 51 appear? If it does the motor
controller has failed, which may be caused by a shorted
motor. Replace the controller, remove and inspect motor for
shorting or burnt windings, If the code 51 does not appear,
check for burnt contactor points. One way is to do a voltage
drop test across the points. There should not be any more
than a few milli-volt drop (or tenths of a volt). Next try driving
the car in each mode Reverse, Low and High, Did the code
set? If it did, clear the code. Make sure the key and the MDS
are off. Remove and insulate the F1, F2, A1, and A2 wires
from the motor. Turn on the MDS, key, and try driving the
car in Reverse, Low, and High. Did the code 51 appear? If
no, the motor is shorted and should be replaced. If the code
51 does appear the controller has failed because of a
shorted motor. Replace both motor and controller.
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