ACC Low Pressure (X21A9) [07/2020 - ]: 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 [07/2020 - 12/2021] 

Result: 

A 

See step  2

1. Using the GTS, clear the Vehicle Control History (RoB).

   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 (RoB).

   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  PROCEDURE - Step 4