DTC P25B4-73: Turbocharger/Supercharger Wastegate "A" Actuator Stuck Closed [09/2023 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   P25B4-73 and other DTCs are output	A
   P25B4-73 is output	B

   HINT: 

   If any DTCs other than P25B4-73 are output, troubleshoot those DTCs first.

Result: 

A 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

Result: 

B 

See step  2

Pre-procedure1

• Disconnect the vacuum hose of the waste gate valve actuator with bracket assembly.
• Put the engine in Inspection Mode (for measuring Exhaust Gas).

  Powertrain > Hybrid Control > Utility 

  Tester Display
  Inspection Mode

• Start the engine.

• Check whether the vacuum hose of the vacuum regulating valve assembly applies no suction your finger.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Waste Gate Valve Actuator with Bracket Assembly

  OK

  Vacuum hose applies no suction to finger.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPLACE VACUUM REGULATING VALVE ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

Result: 

OK 

See step  3

1. Inspect the waste gate valve.

   Refer to INSPECTION [09/2023 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

Result: 

OK 

See step  4

1. Inspect the waste gate valve actuator.

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

Result: 

OK 

See step  5

1. Inspect the mass air flow meter sub-assembly, referring to On-vehicle Inspection for Mass Air Flow Meter.

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

2. Inspect the mass air flow meter sub-assembly, referring to Inspection for Mass Air Flow Meter.

   Refer to INSPECTION [09/2023 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  11

Result: 

OK 

See step  6

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

Result

Result: 

NG 

See step  9

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.

• Perform the All Readiness.

  Powertrain > Engine > Utility 

  Tester Display
  All Readiness

• Input the DTC: P25B4-73.
• Check the DTC judgment result.

  Result

  Result	Proceed to
  NORMAL (DTCs are not output)	A
  ABNORMAL (P25B4-73 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 - ] 

Pre-procedure1

• Disconnect the No. 2 turbo pressure sensor connector.
• Turn the ignition switch to ON.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C42-3 (VC) - C42-2 (E2)	Ignition switch ON	4.5 to 5.5 V	V
  C42-1 (PTA) - C42-2 (E2)	Ignition switch ON	3.0 to 5.5 V	V

Post-procedure1

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

Pre-procedure2

• None

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  C42-3 (VC) - C42-1 (PTA)	Ignition switch off	171 to 189 kΩ	kΩ
  C42-2 (E2) - Body ground	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure2

• None

Result: 

OK 

REPLACE NO. 2 TURBO PRESSURE SENSOR. Refer to  REMOVAL [09/2023 - ] 

Result: 

NG 

See step  10

Pre-procedure1

• Disconnect the No. 2 turbo 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	Result
  C42-3 (VC) - C26-102 (VPTA)	Always	Below 1 Ω	Ω
  C42-2 (E2) - C26-125 (EPTA)	Always	Below 1 Ω	Ω
  C42-1 (PTA) - C26-126 (PTA)	Always	Below 1 Ω	Ω
  C42-3 (VC) or C26-102 (VPTA) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
  C42-1 (PTA) or C26-126 (PTA) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Disconnect the mass air flow meter sub-assembly connector.
• Turn the ignition switch to ON.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C13-3 (VCC) - C13-2 (E2G)	Ignition switch ON	4.8 to 5.2 V	V
  C13-1 (FG) - C13-2 (E2G)	Ignition switch ON	4.8 to 5.2 V	V

Post-procedure1

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

Pre-procedure2

• None

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  C13-3 (VCC) - C13-1 (FG)	Ignition switch off	2.09 to 2.31 kΩ	kΩ
  C13-2 (E2G) - Body ground	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure2

• None

Result: 

OK 

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

Result: 

NG 

See step  12

Pre-procedure1

• Disconnect the mass air flow meter sub-assembly connector.
• Disconnect the ECM connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  C13-3 (VCC) - C26-73 (VCVG)	Always	Below 1 Ω	Ω
  C13-1 (FG) - C26-75 (VG)	Always	Below 1 Ω	Ω
  C13-2 (E2G) - C26-74 (E2G)	Always	Below 1 Ω	Ω
  C13-3 (VCC) or C26-73 (VCVG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
  C13-1 (FG) or C26-75 (VG) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
  C13-2 (E2G) or C26-74 (E2G) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR