Yaw Rate Sensor / Swing Control Errors

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In this article, we explain main controller–related error codes associated with
the yaw rate sensor and swing control system.

This information mainly applies to
Toyota electric forklifts (8FB10–8FB20 series).

These errors may cause symptoms such as:

• Swing lock does not operate
• Swing lock remains engaged and cannot be released

Since these conditions directly affect vehicle stability and operational safety,
proper understanding and early inspection are essential.

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Indicator Lamp Meanings

• Wrench light flashing
  → A fault has been detected, and control is restricted for safety.

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Main Controller Error Code List (52-1 to 55-1)

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① Yaw Rate Sensor Errors (52 Series)

52-1: Yaw Rate Sensor Open Error

• Indicator: Wrench flashing
• Description: Yaw rate sensor circuit open
• Symptoms: Swing lock does not operate

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52-2: Yaw Rate Sensor Short Error

• Indicator: Wrench flashing
• Description: Yaw rate sensor circuit short
• Symptoms: Swing lock does not operate

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52-3: Yaw Rate Sensor Neutral Error

• Indicator: Wrench flashing
• Description: Yaw rate sensor neutral position abnormality
• Symptoms: Swing lock does not operate

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② Swing Angle Sensor Errors (53 Series)

53-1: Swing Angle Sensor Open Error

• Indicator: Wrench flashing
• Description: Swing angle sensor circuit open
• Symptoms: Swing lock remains engaged

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53-2: Swing Angle Sensor Short Error

• Indicator: Wrench flashing
• Description: Swing angle sensor circuit short
• Symptoms: Swing lock remains engaged

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③ Swing Solenoid Errors (54 Series)

54-1: Swing Solenoid Open Error

• Indicator: Wrench flashing
• Description: Swing solenoid circuit open
• Symptoms: Swing lock remains engaged

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54-2: Swing Solenoid Short Error

• Indicator: Wrench flashing
• Description: Swing solenoid circuit short
• Symptoms: Swing lock remains engaged

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54-3: Swing Solenoid Drive Circuit Error

• Indicator: Wrench flashing
• Description: Abnormality in swing solenoid drive circuit
• Symptoms: Swing lock remains engaged

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54-4: Swing Solenoid Open / Short Error

• Indicator: Wrench flashing
• Description: Swing solenoid circuit open or short
• Symptoms: Swing lock remains engaged

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④ Swing Angle Sensor Matching Error (55 Series)

55-1: Swing Angle Sensor Matching Error

• Indicator: Wrench flashing
• Description: Swing angle sensor signal mismatch
• Symptoms: Swing lock remains engaged

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Summary

This article covered yaw rate sensor and swing control–related error codes.

If these errors occur, the following issues may arise:

• Reduced turning stability
• Poor maneuverability
• Safety control restrictions

If any of these error codes are displayed,
early inspection and corrective action are strongly recommended
to maintain safe and stable operation.