DTC P008B-00: Low Pressure Fuel System Pressure - Too High [09/2023 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   P008B-00 and other DTCs are output	A
   P008B-00 is output	B

   HINT: 

   If any DTCs other than P008B-00 are output, troubleshoot those DTCs first.

Result: 

A 

GO TO DTC CHART. Refer To  DIAGNOSTIC TROUBLE CODE CHART [12/2023 - ] 

Result: 

B 

See step  2

Pre-procedure1

• Put the engine in Inspection Mode (for measuring Exhaust Gas).

  Powertrain > Hybrid Control > Utility 

  Tester Display
  Inspection Mode

• Start the engine.

• Record the Fuel Pressure (Low) / Fuel Pressure 2 value.

  Powertrain > Engine > Data List 

  Tester Display
  Fuel Pressure (Low) / Fuel Pressure 2

Post-procedure1

• Turn the ignition switch off.

Pre-procedure2

• Discharge the fuel pressure.
  1. Disconnect the fuel (engine room side) pump assembly (for high pressure side) connector.
  2. Disconnect fuel suction tube with pump and gauge assembly connector.
  3. Put the engine in Inspection Mode (for measuring Exhaust Gas).

     Powertrain > Hybrid Control > Utility 

     Tester Display
     Inspection Mode

  4. Start the engine.
  5. After the engine has stopped on its own, turn the ignition switch off.

     HINT: 

     If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine.

  6. Crank the engine again and make sure that the engine does not start.
  7. Connect the fuel suction tube with pump and gauge assembly connector.
  8. Connect the fuel pump (for low pressure side) (for high pressure side) connector.

• Compare the Fuel Pressure (Low) / Fuel Pressure 2 value recorded with the engine running to the Fuel Pressure (Low) / Fuel Pressure 2 value currently shown on the GTS.

  Result

  Result	Proceed to
  Fuel Pressure (Low) / Fuel Pressure 2 value drops	A
  Fuel Pressure (Low) / Fuel Pressure 2 value is maintained	B

Post-procedure2

• None

Result: 

B 

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [09/2023 - ] 

Result: 

A 

See step  3

Pre-procedure1

• Install the fuel pressure gauge (for low pressure line of low pressure side).

  Refer to ON-VEHICLE INSPECTION [09/2023 - ]

• Compare the values in the Data List using the GTS and the fuel pressure gauge when the Active Test was performed.

  Powertrain > Engine > Active Test 

  Active Test Display
  Control the Fuel Pump Duty Ratio (Brushless)

  Data List Display
  Fuel Pressure (Low) / Fuel Pressure 2

  Standard

  GTS Operation	Standard
  Low	Data List value and fuel pressure gauge are within +/-50 kPa of each other
  High

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [09/2023 - ] 

Result: 

OK 

See step  4

Pre-procedure1

• Install the fuel pressure gauge (for low pressure line of low pressure side).

  Refer to ON-VEHICLE INSPECTION [09/2023 - ]

• Read the values on the Data List and the fuel pressure gauge when the Active Test was performed.

  Powertrain > Engine > Active Test 

  Active Test Display
  Control the Fuel Pump Duty Ratio (Brushless)

  Data List Display
  Fuel Pressure (Low) / Fuel Pressure 2

  Result

  GTS Operation	Fuel Pressure (Low) / Fuel Pressure 2	Fuel Pressure Gauge	Proceed to
  Low	Below 600 kPag	Below 600 kPa (6.1 kgf/cm2 , 87 psi)	A
  	600 kPag or higher	600 kPa (6.1 kgf/cm2 , 87 psi) or higher	B

Post-procedure1

• None

Result: 

B 

REPLACE FUEL PUMP CONTROL ECU. Refer to  REMOVAL [09/2023 - ] 

Result: 

A 

See step  5

Pre-procedure1

• None

• Clear the DTCs.

  Powertrain > Engine > Clear DTCs 

  Result

  Proceed to
  NEXT

Post-procedure1

• Turn the ignition switch off and wait for at least 30 seconds.

Result: 

NEXT 

See step  6

Pre-procedure1

• Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

• Perform the All Readiness.

  Powertrain > Engine > Utility 

  Tester Display
  All Readiness

• Input the DTC: P008B-00.
• Check the DTC judgment result.

  Result

  Result	Proceed to
  NORMAL (DTCs are not output)	A
  ABNORMAL (P008B-00 is output)	B

Post-procedure1

• None

Result: 

A 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [09/2023 - ]