DTC P0555-00: Brake Booster Pressure Sensor(running); DTC P0555-2A: Brake Booster Pressure Sensor Signal Stuck In Range [10/2022 - ]: Procedure

1. Read any other DTCs.

   Powertrain > Stop and Start > Trouble Codes 

   Result

   Result	Proceed to
   P0555-00 or P0555-2A and other DTCs are output	A
   P0555-00 or P0555-2A is output	B

   HINT: 

   If any DTCs other than P0555-00 or P0555-2A are output, troubleshoot those DTCs first.

Result: 

A 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - ] 

Result: 

B 

See step  2

Pre-procedure1

• Start the engine and warm it up.
• Turn the ignition switch off. (*1)
• Turn the ignition switch to ON. (engine is stopped) (*2)

• Depress the brake pedal 5 times and read the changes in the following pressure value. (*3)

  Powertrain > Stop and Start > Data List 

  Tester Display
  Brake Boost Pressure

  OK

  Tester Display	Condition	Normal Condition
  Brake Boost Pressure	Ignition switch ON Brake pedal depressed 5 times	Changes by 20 kPa (150 mmHg, 5.91 in. Hg) or higher

  NOTE:

  Because it is hard to cause variation in the internal pressure before and after depressing the brake pedal if the brake booster internal pressure is high before depressing the brake pedal, do not operate the brake pedal as much as possible between operations (*1) and (*3).

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

Result: 

NG 

See step  3

1. Check the vacuum hose (brake booster hose) for cracks or clogging (visual check).

   HINT: 

   If the braking force is abnormal, inspect the brake booster assembly.

   OK

   No cracks or clogging in the vacuum hose (brake booster hose).

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE VACUUM HOSE 

Result: 

OK 

See step  4

1. Replace the vacuum sensor assembly.

   HINT: 

   Refer to REMOVAL [10/2022 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTC.

   Powertrain > Stop and Start > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

Pre-procedure1

• Start the engine and warm it up.
• Drive the vehicle at 30 km/h (19 mph) or more and stop the vehicle. Repeat this driving pattern 30 times to allow the brake booster vacuum to change.

  Powertrain > Stop and Start > Data List 

  Tester Display
  Brake Boost Pressure

  WARNING:

  When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

• Stop the vehicle.

• Check that no DTCs are output.

  Powertrain > Stop and Start > Trouble Codes 

  Result

  Result	Proceed to
  DTCs are not output	A
  P0555-00 or P0555-2A is output	B

Post-procedure1

• None.

Result: 

A 

END 

Result: 

B 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [10/2022 - ]