Fault Phenomenon: Sinoboom AB46J+ hybrid aerial work platform cannot switch from electric mode to diesel mode, or the engine does not start after switching.

Troubleshooting Process:
– Checked mode switch: switch signal no output.
– Checked generator: generator faulty.
– Checked engine control unit: communication lost.
– Checked interlock logic: conditions not met.

Root Cause: Communication failure of the hybrid control module or generator excitation circuit fault.

Required Parts: Control module or generator components.