DTC P008B-00: Low Pressure Fuel System Pressure - Too High [12/2021 - ]: 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 [12/2021 - ] 

Result: 

B 

See step  2

Pre-procedure1

1. Start the engine.

   Procedure1

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

   Powertrain > Engine > Data List 

   Tester Display
   Fuel Pressure (Low) / Fuel Pressure 2

   Post-procedure1

3. Turn the ignition switch off.

   Pre-procedure2

4. Discharge the fuel pressure.
   1. Remove the EFI MAIN NO. 2 relay from the No. 2 engine room relay block and junction block assembly.
   2. Start the engine.
   3. 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.

   4. Crank the engine again and make sure that the engine does not start.
   5. Install the EFI MAIN NO. 2 relay.

   Procedure2

5. 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.

   Powertrain > Engine > Data List 

   Tester Display
   Fuel Pressure (Low) / Fuel Pressure 2

   HINT: 

   Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).

   Refer to INITIALIZATION [12/2021 - ]

   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

6. None

Result: 

B 

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [12/2021 - ] 

Result: 

A 

See step  3

Pre-procedure1

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

   Refer to PROCEDURE - Step 2

   Procedure1

2. 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

   HINT: 

   Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).

   Refer to INITIALIZATION [12/2021 - ]

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. None

Result: 

NG 

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [12/2021 - ] 

Result: 

OK 

See step  4

Pre-procedure1

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

   Refer to PROCEDURE - Step 2

   Procedure1

2. 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

3. None

Result: 

B 

REPLACE FUEL PUMP CONTROL ECU. Refer to  REMOVAL [12/2021 - ] 

Result: 

A 

See step  5

Pre-procedure1

1. None

   Procedure1

2. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

   Result

   Proceed to
   NEXT

   Post-procedure1

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

Result: 

NEXT 

See step  6

Pre-procedure1

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

   Procedure1

2. Perform the All Readiness.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

3. Input the DTC: P008B-00.
4. Check the DTC judgment result.

   Result

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

   Post-procedure1

5. None

Result: 

A 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2021 - ] 

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [12/2021 - ]