Fault Phenomenon: Schwing S365 runs normally when cold. After reaching operating temperature (water temp 95℃), the engine speed is limited, RPM cannot increase, with no fault codes on the dashboard.

Troubleshooting Process:
– Checked accelerator pedal signal: voltage changes linearly, no open circuit.
– Checked low-pressure fuel circuit: lines clear, hand primer pump feels strong.
– Checked ECU ground wiring: connections tight, no corrosion.
– Measured injector drive waveform at operating temperature: found multi-cylinder drive signals are lost simultaneously.

Root Cause: Engine main wiring harness connector has a loose connection due to heat, causing signal interference and loss.

Required Parts: Engine main wiring harness and connector repair kit.