| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001HG95 |
| Model Year Start: 2019 | Model: RAV4 | Prod Date Range: [02/2019 - 12/2021] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1391; Abnormal Leak in Accumulator; 2019 - 2021 MY RAV4 RAV4 HV [02/2019 - 12/2021] | ||
|
DTC |
C1391 |
Abnormal Leak in Accumulator |
DESCRIPTION
This DTC is stored if internal or external brake fluid leaks are detected due to improper sealing in the brake actuator (brake booster with master cylinder assembly) or brake booster pump assembly. Internal leaks are suspected if the pump motor operates frequently without braking.
|
DTC No. |
Detection Item |
INF Code |
DTC Detection Condition |
Trouble Area |
Note |
|---|---|---|---|---|---|
|
C1391 |
Abnormal Leak in Accumulator |
351 |
Either of the following is detected:
|
|
- |
DTC Detection Conditions: C1391
|
Vehicle Condition |
|||
|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
||
|
Diagnosis Condition |
- |
- |
- |
|
Malfunction Status |
Accumulator pressure sensor input does not increase before braking or while the pump motor is operating |
○ |
- |
|
Accumulator pressure sensor input reduction rate exceeds the specification before braking and while the pump motor is not operating |
- |
○ |
|
|
Detection Time |
- |
- |
|
|
Number of Trips |
1 trip |
1 trip |
|
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
CAUTION / NOTICE / HINT
NOTICE:
When replacing the brake actuator (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.
Click here
![2019 - 2021 MY RAV4 RAV4 HV [02/2019 - 12/2021]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): UTILITY](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK FOR FLUID LEAK |
(a) Check that there are no fluid leaks in the brake lines between the brake actuator (brake booster with master cylinder assembly) and the wheel cylinders.
(b) Check that the brakes are not dragging.
OK:
There are no fluid leaks or dragging.
| NG |
|
REPAIR OR REPLACE APPLICABLE PART |
|
|
2. |
RECONFIRM DTC |
(a) Clear the DTCs.
Click here
Chassis > ABS/VSC/TRAC > Clear DTCs
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON (READY).
(d) Check if the same DTC is output.
Click here
Chassis > ABS/VSC/TRAC > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC C1391 is output. |
A |
|
DTC C1391 is not output. |
B |
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
|
|
3. |
PERFORM ACTIVE TEST USING TECHSTREAM (SOLENOID VALVE) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Select the Active Test on the Techstream.
Click here
Chassis > ABS/VSC/TRAC > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
ECB Solenoid (SMC/SRC/SCC) |
Switching solenoid valve (SMC/SRC/SCC) |
Solenoid ON/OFF |
|
Chassis > ABS/VSC/TRAC > Active Test
|
Tester Display |
|---|
|
ECB Solenoid (SMC/SRC/SCC) |
HINT:
The Active Test can be performed when the following conditions are met.
- ABS main relay is on.
- Shift lever is in P.
- Parking brake is applied.
- Vehicle speed is 0 km/h (0 mph).
(e) Perform the Active Test of the solenoid using the Techstream.
(f) Select the Data List on the Techstream.
Click here
Chassis > ABS/VSC/TRAC > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Wheel Cylinder Pressure Sensor |
Wheel cylinder pressure sensor |
Min.: 0.00 V, Max.: 5.00 V |
Brake pedal released: 0.10 to 0.90 V |
Reading increases when brake pedal is depressed |
Chassis > ABS/VSC/TRAC > Data List
|
Tester Display |
|---|
|
Wheel Cylinder Pressure Sensor |
(g) Check that the output value of the wheel cylinder pressure sensor does not increase.
OK:
The output value of the wheel cylinder pressure sensor does not increase.
HINT:
If the output value increases, there may be brake fluid leaks in the brake actuator (brake booster with master cylinder assembly).
|
Result |
Proceed to |
|---|---|
|
The output value of the wheel cylinder pressure sensor increases. |
A |
|
The output values of the wheel cylinder pressure sensor does not increase. |
B |
| B |
|
|
|
4. |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
(a) Replace the brake actuator (brake booster with master cylinder assembly).
Click here
| NEXT |
|
REPLACE BRAKE BOOSTER PUMP ASSEMBLY
|
|
|