DTC P008A-00: Low Pressure Fuel System Pressure - Too Low [10/2022 - ]: Procedure

1. Check around and beneath the vehicle for fuel leaks, fumes, etc.

   OK

   No fuel leaks present.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE FUEL LEAK POINT 

Result: 

OK 

See step  2

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   P008A-00 and other DTCs are output	A
   P008A-00 is output	B

   HINT: 

   If any DTCs other than P008A-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  3

1. Check whether the fuel pump (for low pressure side) operating sound occurs when performing the Active Test on the GTS.

   Powertrain > Engine > Active Test 

   Tester Display
   Control the Fuel Pump Duty Ratio (Brushless)

   Standard

   GTS Operation	Standard
   High	Operating sounds can be heard from fuel pump (for low pressure side)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO FUEL PUMP CONTROL CIRCUIT. Refer to  Fuel Pump Control Circuit [10/2022 - ] 

Result: 

OK 

See step  4

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.

• Read the value displayed on the GTS 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 to High	When switching from Low to High, Fuel Pressure (Low) / Fuel Pressure 2 value changes

  HINT: 

  Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

See step  11

Result: 

OK 

See step  5

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.

• Read the value displayed on the GTS 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	Fuel Pressure (Low) / Fuel Pressure 2
  Low	50 kPag or higher
  High	420 kPag or higher

  HINT: 

  Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High.

  OK

  Actual Low and High values are as shown above.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

See step  9

Result: 

OK 

See step  6

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  7

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  8

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: P008A-00.

  Result

  Result	Proceed to
  NORMAL (DTCs are not output)	A
  ABNORMAL (DTC P008A-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 - ] 

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.
• Wait for 10 seconds.

Result: 

NEXT 

See step  10

1. 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 is maintained	A
   Fuel Pressure (Low) / Fuel Pressure 2 value drops	B

Result: 

A 

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [10/2022 - ] 

Result: 

B 

REPLACE FUEL MAIN VALVE ASSEMBLY (FOR HIGH PRESSURE). Refer to  REMOVAL [10/2022 - ] 

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 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

  Result

  GTS Operation	Result	Proceed to
  Low to High	Data List value does not change, but fuel pressure gauge changes	A
  	Data List value and fuel pressure gauge do not change	B

Post-procedure1

• None.

Result: 

A 

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

Result: 

B 

REPLACE FUEL PUMP CONTROL ECU. Refer to  REMOVAL [10/2022 - ]