DTC P0089

DTC P0089  : Fuel Pressure Regulator Performance

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• If any of the DTCs listed below are stored at the same time as P0089, troubleshoot those DTCs first, then recheck for P0089.

  P0171, P0172: Fuel system

  P0190, P0191, P0192, P0193: Fuel rail pressure sensor

  P0201, P0202, P0203, P0204: No. 1-No. 4 cylinder injector(s)

  P0300, P0301, P0302, P0303, P0304: No. 1-No. 4 cylinder misfire

  P0351, P0352, P0353, P0354: No. 1-No. 4 cylinder ignition coil(s)

  P2623: High pressure fuel pump

DTC (PGM-FI)

1. Problem verification (idling)

   -1. Record all the on-board snapshots with the HDS.

   -2. Turn the vehicle to the ON mode.

   -3. Clear the DTC with the HDS.

   Clear DTC

   -4. Start the engine.

   -5. Hold the engine speed at 3000 RPM without load (in neutral) until the radiator fan comes on, then let it idle.

   -6. Select the DI Fuel Pressure Test in the INSPECTION MENU with the HDS.

   DI Fuel Pressure Test

   Is the result OK?

   YES 

   Go to step 2.

   NO 

   The failure is duplicated. Go to step 3.

2. Problem verification (test-drive):

   Test-drive the vehicle for several minutes in the range of these recorded on-board snapshot parameters:

   • ENGINE SPEED
   • VEHICLE SPEED
   • MAP Sensor (Hi Res)
   • TP SENSOR
   • APP SENSOR
   • ECT SENSOR 1
   • FUEL PRESSURE CONVERTED FROM PF SENSOR
   • FUEL PRESSURE DIRECT INJECTION SYSTEM
   • IAT SENSOR (1)

   On-board Snapshot

   Signal	Current conditions
   	Values	Unit
   ENGINE SPEED
   VEHICLE SPEED
   MAP Sensor (Hi Res)
   TP SENSOR
   APP SENSOR
   ECT SENSOR 1
   FUEL PRESSURE CONVERTED FROM PF SENSOR
   FUEL PRESSURE DIRECT INJECTION SYSTEM
   IAT SENSOR (1)

   -2. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P0089 Fuel Pressure Regulator Performance

   Is DTC P0089 indicated?

   YES 

   The failure is duplicated. Go to step 3.

   NO 

   Intermittent failure, the system is OK at this time. Test PGM-FI main relay 2 . If the relay is OK, check for a poor connection or loose terminals at the fuel rail pressure sensor, the high pressure fuel pump, and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

3. Fuel pressure check (low pressure side)

   -1. Check the fuel pressure .

   Is the fuel pressure OK?

   YES 

   The fuel pressure (low pressure side) is OK. Go to step 4.

   NO 

   Check the fuel pump, the fuel pressure regulator, the fuel filter , and the fuel lines .

4. High pressure fuel pump cam and pump lifter visual check

   -1. Remove the high pressure fuel pump .

   -2. Visually check the cam that drives the high pressure fuel pump and the pump lifter of the high pressure fuel pump for wear or damage .

   Are the parts OK?

   YES 

   Replace the high pressure fuel pump .

   NO 

   Check for damage of the cam and the pump lifter , and replace the exhaust camshaft and/or the high pressure fuel pump if needed.