7 — DIAGNOSTICS AND TROUBLESHOOTING
pg. 39
1212 & 1212P Manual - Sep 2019
Table 3 TROUBLESHOOTING CHART
LED
CODE
PROGRAMMER
LCD DISPLAY
EXPLANATION
POSSIBLE CAUSE
1,1
THERMAL FAULT
over-/under-temperature cutback
1. Temperature >80°C or < -10°C.
2. Excessive load on vehicle.
3. Operation in extreme environments.
4. Electromagnetic brake not releasing.
1,2
THROTTLE FAULT
PotLow and/or PotWiper out of range
1. Throttle input wire open or shorted.
2. Throttle pot defective.
3. Wrong throttle type selected.
1,3
SPEED POT FAULT
speed limit pot wiper out of range
1. Speed limit pot wire(s) broken or shorted.
2. Broken speed limit pot.
1,4
UNDERVOLTAGE FAULT
battery voltage too low
1. Battery voltage <17 volts.
2. Bad connection at battery or controller.
1,5
OVERVOLTAGE FAULT
battery voltage too high
1. Battery voltage >31 volts.
2. Vehicle operating with charger attached.
3. Intermittent battery connection.
2,1
MAIN OFF FAULT
main contactor driver Off fault
1. Main contactor driver failed open.
2,2
EMR SEQUENCING FAULT
[1212P]
improper sequencing
1. Emerg. Rev. switch pressed before KSI on.
MOTOR STALLED
[1212]
motor stall fault
1. Motor is stalled.
2,3
MAIN FAULT
main contactor fault
1. Main contactor welded or stuck open.
2. Main contactor driver fault.
2,4
MAIN ON FAULT
main contactor driver On fault
1. Main contactor driver failed closed.
2,5
PUMP SRO FAULT
[1212P]
improper sequencing
1. Pump switches pressed before KSI on.
3,1
WIRING FAULT
HPD fault present >10 sec.
1. Misadjusted throttle.
2. Broken throttle pot or throttle mechanism.
3,2
BRAKE ON FAULT
brake On fault
1. Electromagnetic brake driver shorted.
2. Electromagnetic brake coil open.
3,3
PRECHARGE FAULT
precharge fault
1. Brake driver shorted.
2. Precharge circuit damaged.
3. MOSFET failure.
3,4
BRAKE OFF FAULT
brake Off fault
1. Electromagnetic brake driver open.
2. Electromagnetic brake coil shorted.
3,5
HPD FAULT
HPD (High Pedal Disable)
1. Improper sequence of throttle and KSI, push, or inhibit
inputs.
2. Misadjusted throttle pot.
4,1
CURRENT SENSE FAULT
current sense out of range
1. Short in motor or in motor wiring.
2. Controller failure.*
4,2
HARDWARE FAILSAFE
motor voltage out of range
1. Motor voltage does not correspond to throttle request.
2. Short in motor or in motor wiring.
3. Controller failure.*
4,3
EEPROM CHECKSUM FAULT
EEPROM fault
1. EEPROM failure or fault.
4,4
MOTOR OPEN
[1212]
motor open fault
1. Motor wiring is open.
4,5
BATTERY DISCONNECT FAULT
battery disconnected
1. Battery not connected.
2. Poor connection to battery terminals.
*Jack up vehicle and retest to confirm diagnosis. Clean connections, inspect system wiring, and retest.