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11
CONTROLLER DIAGNOSTIC TOOL (CDT)
Fault Descriptions
large solenoids should read 180 to 190 ohms; small solenoids 200 to 250 ohms), a broken blue/white wire at the 16-pin
controller plug or its terminal is loose in the 16-pin plug.
MAIN DROPOUT (1 OR 2)
If the controller detects that the solenoid contacts have opened while the vehicle is in operation, a main dropout fault
is detected.
What it means: Occurs when the solenoid coil losses ground causing the main contact to lose connection. With Main
Dropout 2, the solenoid drops out while the vehicle is in regen/motor braking. Main Dropout 2 is usually a symptom
more than a cause.
What to do: Check the following components: key switch, MCOR, batteries, battery cables, FNR, solenoid coil,
solenoid contacts, and controller 16-pin connector.
MOTOR STALL
If the motor current is high and there is no movement of the vehicle wheels for a short period of time, a motor stall is
detected by the speed controller. This fault can be caused by an operator holding the vehicle on a hill by depressing
the accelerator pedal instead of the brake pedal.
What it means: This fault appears anytime current is running to the motor and no movement of the armature
is registered.
What to do: In most cases this is an operator issue holding the vehicle on an incline with the accelerator pedal,
not the brake pedal. See following NOTE.
NOTE: In rare cases, it could be a controller or drivetrain issue. If the vehicle rolls, the drivetrain is okay. Check to see
if Armature Current spikes to 250 amps when accelerator pedal is pressed. If so, replace controller.
MAIN DRIVER OFF
If the FET that controls the closing of the solenoid is not energized when it should be, a main driver off fault is
detected by the speed controller.
What it means: This is the exact opposite of main driver on. The controller FET controlling the energizing of the
solenoid is off (or not energized) when it should be.
What to do: Replace controller.
CURRENT SENSE FAULT
What it means: If there are problems with the armature current sensor circuitry, a current sense fault is detected and
the controller de-energizes the solenoid coil.
What to do: Clear the Fault History in the CDT. If the fault does not return and the car operates normally, do
not replace the controller. If the fault remains in System Faults or Fault History after clearing and the car will not
operate, replace the controller.
M– SHORTED
If an uncontrolled current path is detected from the motor to B- (bypassing the MOSFETs), an M- shorted fault
is detected.
2019 Precedent Villager 2 Maintenance and Service Manual
Page 11-21
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Table of Contents
Troubleshooting
