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11
CONTROLLER DIAGNOSTIC TOOL (CDT)
Fault Descriptions
THERMAL CUTBACK
If the controller heatsink temperature is found to be in excess of 185 °F (±9) (85 °C (±5)) or below –13 °F (±9) (–25 °C
(±5)), the thermal cutback fault is detected.
What it means: Heatsink temperature rises above 185 °F (85 °C).
What to do: Monitor Heatsink Temp, battery voltage, brakes dragging, car under extreme loads, low or no air
pressure in tire(s).
ANTI-TAMPER FAULT
If communication with the Visage or Guardian unit is interrupted, the controller registers an anti-tamper fault.
What it means: This is a symptom, not a cause. The controller is set to communicate with a Visage or Guardian unit
and it is unable to.
What to do: Clear the Fault History in the CDT. Ensure wiring is connected and inspect for damaged wires. If the
vehicle is not or no longer going to be equipped with these services, change Control Mode setting to zero (0).
HPD
The HPD (High Pedal Detect) fault is detected if the accelerator pedal is already depressed when the key switch is
turned to the ON position. This fault is also detected if the accelerator pedal is pressed when the selected direction
is changed by pressing the Forward/Reverse switch. This fault, when not caused by the operator, can indicate
that the pedal limit switch has failed closed.
What it means: The pedal is depressed before the key switch and/or the FNR is switched on. This is a safety
control and the controller must see the pedal engaged last in the following sequence: key switch first, FNR second,
and then pedal last.
What to do: Check throttle percentage and, if at 0, issue is driver error.
MAIN DRVR OVERCURRENT
If the current on the relay driver exceeds 120 mA, or the current on the solenoid driver exceeds 6 A, a main driver
overcurrent fault is detected.
LOCKOUT FAULT
If the controller receives a signal that the charger interlock is activated while the vehicle is being driven, the controller
registers a lockout fault and may prevent the vehicle from operating.
What it means: This is a symptom, not a cause. The controller should only see charger interlock activated when
the charger's DC cord (external charger) is connected to the vehicle. One possible cause is failure of the 10k ohm
resistor in the charger interlock circuit.
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 continues to occur, inspect and test the charger interlock circuit. See Test Procedure
10 – Charger Interlock on page 12-21. If the 10k ohm resistor has failed, replace resistor. If no problems are found
in the charger interlock circuit, replace the controller.
LOW SOC
If the controller sees that the battery pack has reached a low state of charge (SOC), the controller registers a low
SOC fault.
2019 Precedent Villager 2 Maintenance and Service Manual
Page 11-19
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Table of Contents
Troubleshooting
