Error message "IMU Undetected" is displayed.

Issue

The message "IMU Undetected" is displayed.

・Bucket IMU Undetected

・Arm IMU Undetected

・Boom IMU Undetected

・Body IMU Undetected

Answer

The following review may improve the situation. Please check.

How to deal

Simplified Table (Main Factors)

Item	Confirmation details
1.Disconnection of IMU sensor (Loose connector)	・Check the condition of the IMU sensor (visual check). ・Inspect the state of the IMU connector. Remove the connectors and inspect the state of the pins and the tightness or looseness of the connector. ・If there is dirt, clean with contact cleaner, etc. and reconnect.
2. Disconnection of harness. (Loose connectors)	・Inspect the condition of connectors between harnesses. Remove the connectors and inspect the state of the pins and the tightness or looseness of the connector. ・If there is dirt, clean with contact cleaner, etc. and reconnect.
3. Defective IMU sensor	・If there is no problem in [1] and [2], the IMU sensor may be defective. Please also investigate the exchange it.

Simplified Table (Others)

Item	Confirmation details
4.Initialize IMU sensors (All IMU sensors become undetected)	・If two or more IMU sensors of the same location are connected, one of the duplicate IMU sensors will be initialized and that IMU sensor will not be available. e.g. Bucket IMU sensors are attached to both the bucket and the body. e.g. Boom IMU sensors are attached to both the bucket and the boom.

Simple Diagnosis Method

If the error is not resolved after inspection, cleaning, and reconnection of the IMU sensor and harness in the simplified table above, the harness may be disconnected or the IMU sensor may be defective.

ⅰ）Check for defective IMU sensor: Install a new IMU sensor for the same part and check if the error is resolved.

ⅱ）Disconnection of the harness: If the error is not resolved in i), the harness may be disconnected. Please consider replacing the harness.

Error indication and review points　

Error indication	review points *Refer to [Each IMU sensor and wiring] in the figure below for (1) to (5).
	(1) IMU sensor Harness connection	(2) IMU sensor Harness connection Intermediate harness	(3) IMU sensor	(4) IMU sensor	(5) Intermediate harness Controller connection
・Bucket IMU Undetected	〇
・Arm IMU Undetected		〇
・Boom IMU Undetected			〇
・Body IMU Undetected				〇
・Bucket IMU Undetected ・Arm IMU Undetected	〇	〇
・Bucket IMU Undetected ・Arm IMU Undetected ・Boom IMU Undetected	(〇)	(〇)	(〇)		〇
・Bucket IMU Undetected ・Arm IMU Undetected ・Boom IMU Undetected ・Body IMU Undetected	(〇)	(〇)	(〇)	(〇)	〇

[Each IMU sensor and wiring]

Installation point of actual machine (approximate location)

*The installation points may differ slightly depending on the manufacturer, size, and specifications of the machine. Please check the actual machine.

Simplified circuit diagram (*In case of PC200 series)

Supplement: How to remove the IMU sensor

・IMU sensor is not fixed (unlocked)

The red switch is unlocked when it is off the opposite side of the IMU sensor.

　　

・IMU sensor fixed (locked)

The red switch is locked when it is pushed toward the IMU sensor.

　　

How to remove the IMU sensor

In the unlocked state, remove the IMU sensor while pressing and squeezing the red frame.