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In this article, we explain Pump Motor Driver–related error codes that occur on Toyota electric forklifts (8FB series).

The Pump Motor Driver is a critical unit that controls:

• Load handling operations (lifting and lowering)
• Steering assist

When this unit has a problem, you may experience:

• Load operation stops
• Limited lifting speed
• Steering becomes heavy
• Error is displayed, but operation is still possible

In this article, we explain what each error means and what symptoms appear in actual operation, in a clear and simple way.

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① Temperature / Voltage Errors (Overheating, PCB Temperature, High Voltage)

■ PCR (A0-2): Load Main Circuit Temperature Too High

Display: O/H lamp ON
Symptom: Load operation disabled, steering becomes heavy
→ The main load circuit has overheated.

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■ A1-4: Pump Motor Driver High Voltage

Display: Wrench blinking
Symptom: Load operation disabled, steering becomes heavy
→ The voltage exceeded the specified limit.

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■ PCR (A2-3): Pump Motor Driver PCB Temperature Too High

Display: O/H lamp ON
Symptom: Load operation disabled, steering becomes heavy
→ The internal PCB temperature of the driver is too high.

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■ AA-4: PCB Temperature Sensor Error / VCC Short

Display: Wrench blinking
Symptom: Load lifting speed limited
→ The temperature sensor may be open or shorted.

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② Main Circuit / Current Sensor Errors

■ E0-2: Main Circuit Error

Display: Wrench blinking
Symptom: Load operation disabled, steering becomes heavy
→ A typical error indicating a problem in the main circuit.

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■ E1-1: Current Sensor Overcurrent Error

Display: Wrench blinking
Symptom: Load operation disabled, steering becomes heavy
→ Excessive current was detected.

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③ Motor Temperature / Sensor Errors

■ PM (E2-1): Pump Motor Temperature Too High

Display: O/H lamp ON
Symptom: Load lifting speed limited
→ The pump motor itself is overheating.

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■ E2-2: Temperature Sensor Open / Short

Display: Wrench blinking
Symptom: Load lifting speed limited
→ Likely caused by sensor or wiring failure.

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■ E3-1: Main Circuit Temperature Sensor Open / Short

Display: Wrench blinking
Symptom: Load lifting speed limited
→ The system cannot correctly monitor main circuit temperature.

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④ Rotation Sensor Errors

■ E8-1: Pump Motor Rotation Sensor Open (Disconnected)

Display: Wrench blinking
Symptom: Load operation disabled, steering becomes heavy

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■ E8-2: Pump Motor Rotation Sensor Short

Display: Wrench blinking
Symptom: Load operation disabled, steering becomes heavy

→ Motor rotation cannot be detected correctly, so load operation is disabled for safety.

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⑤ CPU Errors / ID Errors / Communication Errors

■ EC-1 / EC-2 / EC-3 / EC-4: CPU Error

Display: Wrench blinking
Symptom: Load operation disabled, steering becomes heavy
→ Internal CPU failure in the Pump Motor Driver.

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■ EC-6: CPU Error (Display Only)

Display: Wrench blinking
Symptom: Error displayed only, normal operation possible
→ A minor CPU abnormality.

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■ 32-3: Pump Motor Driver ID Error

Display: Wrench blinking
Symptom: Error displayed only, normal operation possible
→ An issue with ID recognition or configuration.

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■ 33-3: Main Controller → Pump Motor Driver Communication Error

Display: Wrench blinking
Symptom: Load operation disabled, steering becomes heavy
→ Communication between the controllers has failed.

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✔ Summary

Pump Motor Driver errors can be grouped into:

• Temperature-related issues (overheating, PCB temperature)
• Voltage and current abnormalities
• Motor and sensor failures
• CPU and communication errors

Many of these errors directly affect load handling and steering, making them critical in daily operations.

When these errors occur, we recommend checking:

• Temperature conditions
• Wiring and connectors
• Sensors
• The Pump Motor Driver unit itself

as soon as possible.