P1186 HYUNDAI - Fuel Pressure Monitoring-Minimum Pressure at Engine Speed Too Low
- Faulty Fuel pressure regulator valve (Stuck Open)
- Faulty Rail pressure sensor
- Rail pressure sensor harness is open or shorted
- Rail pressure sensor circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1186 HYUNDAI Description
However when the problem that leads rail pressure to out of target value intended by ECM occurs due to mechanical or electronical reason, ECM shuts engine down and sets Diagnostic Trouble Code (DTC) by limiting fuel (stops injector operation) in order to prevent engine from being controlled abnormally. "rail pressure monitoring error" is the DTC which diagnose 1).supplying state of low pressure fuel and 2).mechanical operating conditions of high pressure pump and 3) indirectly based on RPS output voltage and RPS duty. thus, repair relevant to this DTC requires mechanics the total understand of fuel system.
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