DTC P008B-00: Low Pressure Fuel System Pressure - Too High [10/2022 - ]: 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 [10/2022 - 08/2023]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - 10/2024]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2024 - ] 

Result: 

B 

See step  2

Pre-procedure1

• Start the engine.

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

  Powertrain > Engine > Data List 

  Tester Display
  Fuel Pressure (Low) / Fuel Pressure 2

  Result

  Proceed to
  NEXT

Post-procedure1

• Turn the ignition switch off.

Result: 

NEXT 

See step  3

Pre-procedure1

• Discharge the fuel pressure.

  HINT: 

  DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

  1. Remove the EFI-MAIN NO. 2 fuse from the No. 1 engine room relay block and No. 1 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 fuse.

• 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

  Result

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

Post-procedure1

• None.

Result: 

B 

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [10/2022 - ] 

Result: 

A 

See step  4

Pre-procedure1

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Fuel Tube Sub-assembly (Vehicle Side)
  *a	SST (Hose Band)
  *b	SST (T Joint)
  *c	SST (Gauge)
  *d	SST (Hose Joint)
  *e	SST (Hose)
  *f	SST (Fuel Tube Connector)
  *g	Fuel Pipe (Vehicle Side)

• 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 [10/2022 - ] 

Result: 

OK 

See step  5

Pre-procedure1

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Fuel Tube Sub-assembly (Vehicle Side)
  *a	SST (Hose Band)
  *b	SST (T Joint)
  *c	SST (Gauge)
  *d	SST (Hose Joint)
  *e	SST (Hose)
  *f	SST (Fuel Tube Connector)
  *g	Fuel Pipe (Vehicle Side)

• 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 [10/2022 - ] 

Result: 

A 

See step  6

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  7

Pre-procedure1

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

• Check the DTC judgment result.

  Powertrain > Engine > Utility 

  Tester Display
  All Readiness

• Input the DTC: P008B-00.

  Result

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

Post-procedure1

• None.

Result: 

A 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ] 

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [10/2022 - ]