DTC P04F0-9C: Evaporative Emission System High Load Purge Line "A" Performance Low/Insufficient Flow [12/2021 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   P04F0-9C and other DTCs are output	A
   P04F0-9C and P0441-9C are output	B
   P04F0-9C is output	C

   HINT: 

   If any DTCs other than P04F0-9C are output, troubleshoot those DTCs first.

Result: 

A 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2021 - 10/2023]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ] 

Result: 

B 

GO TO DTC P0441-9C. Refer to  DTC P0441-9C: Evaporative Emission System Incorrect Purge Flow Low/Insufficient Flow [12/2021 - ]  

Result: 

C 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the high load purge line connections.

   OK

   High load purge line is connected correctly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

SECURELY RECONNECTION HIGH LOAD PURGE LINE 

Result: 

OK 

See step  3

Pre-procedure1

• Disconnect the vacuum hose from the purge VSV.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Purge VSV
  *2	High load purge line (to No. 2 compressor inlet elbow)
  *3	Vacuum gauge

• Connect the vacuum gauge to the purge line (to No. 2 compressor inlet elbow)
• Start the engine.

• Perform the "Control the Wastegate Valve Duty Ratio Bank2".

  Powertrain > Engine > Active Test 

  Active Test Display
  Control the Wastegate Valve Duty Ratio Bank2

  Data List Display
  Wastegate Valve Control Duty Ratio Bank2

• Operate the Active Test at 30%.
• Check the suction while racing the engine at 3000 rpm.

  OK

  Suction applied.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

See step  10

Result: 

OK 

See step  4

Refer to INSPECTION [12/2021 - ]

Result

Result: 

NG 

REPLACE PURGE VSV. Refer to  REMOVAL [12/2021 - ] 

Result: 

OK 

See step  5

1. Check the purge pressure sensor hose.

   OK

   Purge pressure sensor hose is not clogged and damaged.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CLEAN OR REPLACE PURGE PRESSURE SENSOR HOSE 

Result: 

OK 

See step  6

Pre-procedure1

• Disconnect the purge pressure sensor connector.
• Disconnect the ECM connector.

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition
  C185-3 (VC) - C38-36 (VCPH)	Always	Below 1 Ω
  C185-2 (PPG) - C38-34 (PHPG)	Always	Below 1 Ω
  C185-1 (GND) - C38-35 (EPHP)	Always	Below 1 Ω
  C185-3 (VC) or C38-36 (VCPH) - Body ground and other terminals	Always	10 kΩ or higher
  C185-2 (PPG) or C38-34 (PHPG) - Body ground and other terminals	Always	10 kΩ or higher
  C185-1 (GND) or C38-35 (EPHP) - Body ground and other terminals	Always	10 kΩ or higher

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

HINT: 

Refer to REMOVAL [12/2021 - ]

Result

Result: 

NEXT 

See step  8

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  9

Pre-procedure1

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

• Read the DTCs.

  Powertrain > Engine > Trouble Codes 

  Result

  Result	Proceed to
  DTCs are not output	A
  P04F0-9C is output	B

Post-procedure1

• None

Result: 

A 

END 

Result: 

B 

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

1. Check the high load purge line.

   OK

   High load purge line is not clogged and damaged.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CLEAN OR REPLACE HIGH LOAD PURGE LINE 

Result: 

OK 

See step  11

Refer to ON-VEHICLE INSPECTION [12/2021 - ]

Result

Result: 

NG 

CLEAN OR REPLACE NO. 2 COMPRESSOR INLET ELBOW 

Result: 

OK 

See step  12

1. Check the ejector drive line.

   OK

   Ejector drive line is not clogged and damaged.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CLEAN OR REPLACE EJECTOR DRIVE LINE 

Result: 

OK 

See step  13

1. Inspect the No. 2 compressor outlet elbow.

   OK

   Ejector drive port of the No. 2 compressor outlet elbow is not clogged and damaged.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  5

Result: 

NG 

CLEAN OR REPLACE NO. 2 COMPRESSOR OUTLET ELBOW