Symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

- Fuel pressure regulator harness is open or shorted - Fuel pressure regulator electrical circuit poor connection - Faulty fuel pressure regulator - Faulty fuel pressure sensor

Description

The Engine Control Module (ECM) uses commanded fuel pump flow to determine a desired fuel rail pressure. The actual fuel pressure is monitored using the Fuel Rail Pressure (FRP) Sensor.