P0089
Powertrain Codes
P0089 - ISUZU - Fuel Rail Pressure Performance
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- Fuel pressure solenoid harness is open or shorted - Fuel pressure solenoid electrical circuit poor connection - Faulty fuel pressure regulator - Faulty fuel pressure sensor (ECM)
When Detected
Fuel rail pressure greater than 1450psi over desired rate
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.