ERROR CODE LIST – Main Controller Error (2)
WELCOME TO TAS FL
In this article, we explain main controller–related error codes mainly associated with
accelerator, brake, inclination sensors, MB contactors, and communication errors
commonly displayed on Toyota electric forklifts (8FB10–8FB20 series).
While some of these errors only trigger warning displays, others may result in travel stop, reduced speed, or loss of steering assistance.
Understanding these codes helps prevent unexpected downtime at job sites.
Indicator Lamp Meanings
- Wrench light flashing
→ A fault has been detected, and the system may limit operation for safety. - O/H (Overheat) light ON
→ Not used in this error group.
Main Controller Error Code List (C4-1 to EE-2)
① Accelerator Potentiometer Errors (C4 Series)
C4-1: Accelerator Potentiometer POT1 Open
- Indicator: Wrench flashing
- Description: Accelerator potentiometer POT1 circuit open
- Symptoms: Error display only, normal operation possible
C4-2: Accelerator Potentiometer POT2 Open
- Indicator: Wrench flashing
- Description: Accelerator potentiometer POT2 circuit open
- Symptoms: Error display only, normal operation possible
C4-3: Accelerator Potentiometer POT1 VCC Short
- Indicator: Wrench flashing
- Description: POT1 power supply short circuit
- Symptoms: Error display only, normal operation possible
C4-4: Accelerator Potentiometer POT2 VCC Short
- Indicator: Wrench flashing
- Description: POT2 power supply short circuit
- Symptoms: Error display only, normal operation possible
C4-5: Accelerator Potentiometer Offset Error
- Indicator: Wrench flashing
- Description: Accelerator neutral position offset detected
- Symptoms: Travel stop
C4-6: Accelerator Potentiometer Matching Error
- Indicator: Wrench flashing
- Description: POT1 and POT2 signal mismatch
- Symptoms: Accelerator free play increases, maximum speed reduced
② Brake Potentiometer Errors (C5 Series)
C5-1: Brake Potentiometer POT1 Open
- Indicator: Wrench flashing
- Description: Brake potentiometer POT1 circuit open
- Symptoms: Error display only, normal operation possible
C5-2: Brake Potentiometer POT2 Open
- Indicator: Wrench flashing
- Description: Brake potentiometer POT2 circuit open
- Symptoms: Error display only, normal operation possible
C5-3: Brake Potentiometer POT1 VCC Short
- Indicator: Wrench flashing
- Description: POT1 power supply short circuit
- Symptoms: Error display only, normal operation possible
C5-4: Brake Potentiometer POT2 VCC Short
- Indicator: Wrench flashing
- Description: POT2 power supply short circuit
- Symptoms: Error display only, normal operation possible
C5-5: Brake Potentiometer Offset Error
- Indicator: Wrench flashing
- Description: Brake pedal neutral position offset detected
- Symptoms: Reduced maximum speed, slow acceleration
C5-6: Brake Potentiometer Matching Error
- Indicator: Wrench flashing
- Description: POT1 and POT2 signal mismatch
- Symptoms: Travel stop
③ Inclination Sensor Errors (C9 Series)
C9-1: Inclination Sensor Open
- Indicator: Wrench flashing
- Description: Inclination sensor circuit open
- Symptoms: Hill assist function disabled
C9-2: Inclination Sensor Short
- Indicator: Wrench flashing
- Description: Inclination sensor short circuit
- Symptoms: Hill assist function disabled
C9-3: Inclination Sensor Matching Error
- Indicator: Wrench flashing
- Description: Sensor signal mismatch detected
- Symptoms: Hill assist function disabled
④ MB Contactor Errors (CB Series)
CB-1: MB Contactor Open
- Indicator: Wrench flashing
- Description: MB contactor open detected
- Symptoms: Travel and load handling stop, steering becomes heavy
CB-2: MB Contactor Short
- Indicator: Wrench flashing
- Description: MB contactor short circuit
- Symptoms: Error display only, normal operation possible
CB-3: MB Contactor Coil Open
- Indicator: Wrench flashing
- Description: Contactor coil circuit open
- Symptoms: Travel and load handling stop, steering becomes heavy
CB-4: MB Contactor Drive Circuit Error
- Indicator: Wrench flashing
- Description: Abnormality in contactor drive circuit
- Symptoms: Travel and load handling stop, steering becomes heavy
CB-5: MB Contactor Coil Short
- Indicator: Wrench flashing
- Description: Contactor coil short circuit
- Symptoms: Travel and load handling stop, steering becomes heavy
⑤ Communication Errors (ED / EE Series)
ED-1: CAN Bridge Controller Communication Error
- Indicator: Wrench flashing
- Description: Communication error between CAN bridge controller and main controller
- Symptoms: Authentication impossible
EE-1: Display → Main Controller Communication Error
- Indicator: Wrench flashing
- Description: Communication error from display unit
- Symptoms: 일부 display functions disabled
EE-2: Display → Main Controller Communication Error
- Indicator: Wrench flashing
- Description: Communication error from display unit
- Symptoms: 일부 display functions disabled
Summary
These error codes mainly relate to operator input devices, safety sensors, power contactors, and communication lines.
Some errors allow limited operation, while others require immediate inspection to prevent safety risks.
- Resisted date 2026.01.14