Fault Phenomenon: SANY SG215 grader engine difficult to start, common rail pressure fault reported.

Troubleshooting Process:
– Read data stream: rail pressure signal 0 or max value.
– Checked sensor: internal sensor damage.
– Checked wiring: short or open circuit.
– Checked pump: high-pressure pump working normally.

Root Cause: The high-pressure pressure sensor on the common rail failed, preventing the ECU from correctly controlling fuel injection quantity.

Required Parts: Common rail pressure sensor assembly.