Failure Cause:

• CAN bus communication disconnection between main controller and control module.

Troubleshooting Steps:

1. ​Inspect Wiring Connections:
   • Check all wiring connections related to the system.
2. ​Test Actuator Housing:
   • If wiring is normal, inspect the actuator housing for damage or loose components.
3. ​Replace Actuator Housing (if required):
   • Replace the actuator housing if faults persist.

Failure Cause:

• CAN bus communication disconnection between main controller and control module.

Troubleshooting Steps:

1. ​Inspect Wiring Connections:
   • Check all wiring connections related to the system.
2. ​Test Actuator Housing:
   • If wiring is normal, inspect the actuator housing for damage or loose components.
3. ​Replace Actuator Housing (if required):
   • Replace the actuator housing if faults persist.

Failure Cause:

• Significant discrepancy between servo motor expected values and actual readings detected.

Troubleshooting Steps:

1. ​Inspect Servo Motor and Rotor:
   • Check if the servo motor or rotor is physically jammed.
2. ​Check Wiring Connections:
   • If no mechanical blockage is found, verify the servo motor wiring for damage or loose connections.
3. ​Determine Servo Motor Condition:
   • If wiring is intact, test the servo motor functionality.
   • Replace the servo motor if confirmed to be faulty

Failure Cause:

• Short circuit of the flow meter may occur after the left spray nozzle actuator reports disconnection, as both share a common communication link with the flow meter/controller interface.

Troubleshooting Steps:

1. ​Test Left Nozzle Actuators:
   • Remove the left spray nozzles sequentially and restart the system.
   • Observe if the fault persists.
2. ​Determine Fault Source:
   • If the fault resolves after removing a nozzle → Replace the faulty spray nozzle actuator.
   • If the fault remains → Replace the flow meter.

Failure Cause:

• Short circuit of the water pump may occur after nozzle actuator disconnection, as both share a common communication link with the pump/controller interface.

Troubleshooting Steps:

1. Identify whether the left or right pump shows disconnection.
2. For the affected pump side:
   • Remove all nozzles sequentially and test system response.
3. If the fault persists:
   • Replace the water pump with a new unit

Failure Cause:

• Excessive current draw
• Overheating of the actuator

Troubleshooting Steps:

1. Power off the system and allow the disk/gear actuator to cool down.
2. Restart the system to check if normal operation is restored.
3. If unresolved:
   • Inspect the gear/disk actuator for physical damage.
   • Replace the spray nozzle actuator if necessary.

Failure Cause: Weight sensor detects an anomaly (single module reading exceeds maximum weight threshold).
Troubleshooting Method: Remove and replace the corresponding weight sensor module.

Failure Cause:
The system cannot retrieve nozzle status information due to damaged spray nozzle actuators preventing data transmission.

Troubleshooting Steps:

1. ​Inspect Actuator Interfaces:

   • Check for loose connections at the actuator interfaces.
   • Verify continuity between the actuator and main control unit (MCU).

2. ​Check Boom Wiring Harnesses:

   • Examine the forward/backward boom wiring harnesses for damage or improper connections.

3. ​Actuator Interface Validation:

   • Physically inspect all actuator interfaces at the spraying components for corrosion or wear

Failure Cause:
Potential short circuit of the flow meter port caused by burnt spray nozzle actuators. This occurs because the main control unit (MCU) internally integrates the spray module control board with the actuator port signal wiring harness.

Troubleshooting Steps:

1. ​Spray Nozzle Actuator Inspection:

   • Short circuits in left-side actuators (tail section) may affect the flow meter.
   • Remove the spray nozzle actuators from the left side of the tail section to inspect for damage.

2. ​Electrical Testing:

   • After removing damaged actuators, power on the aircraft to test.
   • Verify whether the flow meter short circuit was caused by the faulty actuator.