P0089 - Fuel Pressure Regulator '1' Performance
Fuel Pressure Regulators are used to control and regulate the fuel system pressure to ensure a steady and sufficient supply of fuel depending on the current engine load. The ECM will normally operate some form of electrical solenoid / motor to regulate the fuel pressure based on feedback provided by the fuel pressure sensor.
Fault Code Explained
This fault code is usually stored when an undefined fault with the Fuel Pressure Regulator has occurred. The ECM has detected that the fuel pressure is not responding as expected to the Fuel Pressure Regulator commands.
Due to the variety of systems and methods used for Fuel Pressure Control it is recommended to follow the manufacturers test plan for this fault code.
The following are some of the general tests that should be carried out
- Use fuel pressure gauge to measure actual fuel pressure
- Test Fuel Pressure Sensor output compared to actual fuel pressure
- Test Fuel Pressure Regulator Wiring and operation