ACC Low Pressure (X21A9) [12/2019 - ]: Procedure

1. Perform the Health Check using the GTS.

   Result

   Result	Proceed to
   DTCs are not output.	A
   DTCs are output.	B

Result: 

B 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2021]  , or Refer To  DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023]  , or Refer To  DIAGNOSTIC TROUBLE CODE CHART [11/2023 - ] 

Result: 

A 

See step  2

1. Using the GTS, clear the Vehicle Control History.

   Chassis > Brake Booster > Utility 

   Tester Display
   Vehicle Control History (RoB)

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
2. Using the GTS, check for Vehicle Control History.

   Chassis > Brake Booster > Utility 

   Tester Display
   Vehicle Control History (RoB)

   Result

   Result	Proceed to
   X21A9 is not output.	A
   X21A9 is output.	B

Result: 

A 

END 

Result: 

B 

GO TO BRAKE SYSTEM ON-VEHICLE INSPECTION. Refer to  ON-VEHICLE INSPECTION [12/2019 - ]