Curtis 1212 Manual
37
7 — DIAGNOSTICS & TROUBLESHOOTING
Table 3 TROUBLESHOOTING CHART
L ED CODE
PROGRAMMER
TYPE
LCD DISPLAY EXPLANATION
POSSIBLE CAUSE
0 1 2
4,5 1 9 BATTERY DISCONNECT battery disconnected 1. Battery not connected.
FAULT 2. Poor connection to battery terminals.
3,4 8 9 BRAKE OFF FAULT brake Off fault 1. Electromagnetic brake driver open.
2. Electromagnetic brake coil shorted.
3,2 9 5 BRAKE ON FAULT brake On fault 1. Electromagnetic brake driver shorted.
2. Electromagnetic brake coil open.
4,1 8 9 CURRENT SENSE FAULT current sense out of range 1. Short in motor or in motor wiring.
2. Controller failure.
★
4,3 8 9 EEPROM CHECKSUM FAULT EEPROM fault 1. EEPROM failure or fault.
4,2 8 9 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. ★
3,5 7 6 HPD FAULT HPD (High Pedal Disable) 1. Improper sequence of throttle and KSI,
push, or inhibit inputs.
2. Misadjusted throttle pot.
2,3 8 9 MAIN FAULT main contactor fault 1. Main contactor welded or stuck open.
2. Main contactor driver fault.
2,1 8 9
MAIN OFF FAULT main contactor driver Off fault 1. Main contactor driver failed open.
2,4 8 9
MAIN ON FAULT main contactor driver On fault 1. Main contactor driver failed closed.
1,5 10 3 OVERVOLTAGE FAULT battery voltage too high 1. Battery voltage >31 volts.
2. Vehicle operating with charger attached.
3. Intermittent battery connection.
3,3 8 9 PRECHARGE FAULT precharge fault 1. Brake driver shorted.
2. Precharge circuit damaged.
3. MOSFET failure.
1,3 – 7 SPEED POT FAULT speed limit pot wiper 1. Speed limit pot wire(s) broken or shorted.
out of range 2. Broken speed limit pot.
1,1 – – THERMAL FAULT over-/under-temperature 1. Temperature >80°C or < -10°C.
cutback 2. Excessive load on vehicle.
3. Operation in extreme environments.
4. Electromagnetic brake not releasing.
1,2 7 7
THROTTLE FAULT PotLow and/or PotWiper 1. Throttle input wire open or shorted.
out of range 2. Throttle pot defective.
3. Wrong throttle type selected.
1,4 1 2
UNDERVOLTAGE FAULT battery voltage too low 1. Battery voltage <17 volts.
2. Bad connection at battery or controller.
3,1 7 6 WIRING FAULT HPD fault present >10 sec. 1. Misadjusted throttle.
2. Broken throttle pot or throttle mechanism.
★ Jack up vehicle and retest to confirm diagnosis. Clean connections, inspect system wiring, and retest.
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