Speed Sensor; Main Welded; Main Driver On; Main Driver Off - Club Car Precedent 2014 Maintenance And Service Manual

IQ DISPLAY MODULE (IQDM) AND IQDM-P
DIAGNOSTICS: EXCEL SYSTEM WITH
11
Faults Menu POWERDRIVE CHARGER
What it means: If the voltage seen by the controller coming out of the MCOR3 is not within specified limits, this fault
occurs. Perform additional diagnostic if vehicle is running.
What to do: Replace MCOR3. See following NOTE.
NOTE: Newer controllers may, infrequently, read voltages above or below limits and give a false fault.

SPEED SENSOR

If the speed controller does not detect pulses from the speed sensor while the controller outputs power (greater than
75% armature PWM) to the motor, a speed sensor fault is detected.
What it means: Speed sensor is not working. Check connection.
What to do: Replace speed sensor.

MAIN WELDED

If the speed controller detects that the solenoid contacts are welded closed, a main welded fault is detected.
What it means: The solenoid contact is welded closed and will not dropout when pedal is released, or key switch
is turned to OFF, or FNR is switched to N.
What to do: Replace solenoid. If vehicle continues to operate at half speed, check accessory wiring.

MAIN DRIVER ON

If the FET that controls the closing of the solenoid contacts is found to be energized when it should not be, a main
driver on fault is detected by the speed controller.
What it means: The controller FET controlling the energizing of the solenoid is on (or energized) when it should
not be. This causes main contactors to stay engaged.
What to do: 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: The controller FET controlling the energizing of the solenoid is off (or not energized) when it should be.
What to do: Replace controller.

MAIN COIL OPEN

If the speed controller determines that the solenoid is not closing as a result of a solenoid coil failure, a main coil
open fault is detected.
What it means: An open circuit in the solenoid coil. It could be in either the ground side or B+ side of the circuit.
What to do: Check for a broken or disconnected blue wire on the B+ side of the solenoid coil, a broken or disconnected
blue/white wire on the B- side of the solenoid coil, a broken coil wire inside the solenoid which would result in zero
ohms resistance reading, a defective coil which could result in very low coil resistance (usually less than 40 ohms;
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.
Page 11-12 2014 Precedent ® Golf Car Maintenance and Service Manual