- Accumulator pressure dropped due to frequent brake pedal operation
- Pump motor malfunction
- Accumulator deterioration
- Accumulator pressure sensor (brake booster with master cylinder assembly)
- Supply voltage reduced
| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM1000000021IE6 |
| Model Year Start: 2022 | Model: RAV4 | Prod Date Range: [12/2021 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): ACC Low Pressure (X21A9); 2022 - 2024 MY RAV4 RAV4 HV [12/2021 - ] | ||
|
ACC Low Pressure (X21A9) |
DESCRIPTION
|
Code |
Tester Display |
Measurement Item |
Trouble Area |
Output ECU |
|---|---|---|---|---|
|
X21A9 |
ACC Low Pressure |
History of a continuous and significant decrease in accumulator pressure |
|
No. 1 skid control ECU (brake booster with master cylinder assembly) |
PROCEDURE
|
1. |
CHECK DTC (HEALTH CHECK) |
(a) Perform the Health Check using the GTS.
|
Result |
Proceed to |
|---|---|
|
DTCs are not output. |
A |
|
DTCs are output. |
B |
| B |
|
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
|
2. |
CLEAR VEHICLE CONTROL HISTORY (RoB) |
(a) Using the GTS, clear the Vehicle Control History (RoB).
Chassis > Brake Booster > Utility
|
Tester Display |
|---|
|
Vehicle Control History (RoB) |
|
|
3. |
CHECK VEHICLE CONTROL HISTORY (RoB) |
(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(b) Using the GTS, check for Vehicle Control History (RoB).
Chassis > Brake Booster > Utility
|
Tester Display |
|---|
|
Vehicle Control History (RoB) |
|
Result |
Proceed to |
|---|---|
|
X21A9 is not output. |
A |
|
X21A9 is output. |
B |
| A |
|
END |
| B |
|
|
|