| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM10000000214QS |
| Model Year Start: 2022 | Model: RAV4 | Prod Date Range: [12/2021 - 10/2023] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C141C12,C141C14,C141C1C; Brake Booster Motor "A" Control Circuit Short to Battery; 2022 - 2023 MY RAV4 RAV4 HV [12/2021 - 10/2023] | ||
|
DTC |
C141C12 |
Brake Booster Motor "A" Control Circuit Short to Battery |
|
DTC |
C141C14 |
Brake Booster Motor "A" Control Circuit Short to Ground or Open |
|
DTC |
C141C1C |
Brake Booster Motor "A" Control Circuit Voltage Out of Range |
DESCRIPTION
The No. 1 skid control ECU (brake booster with master cylinder assembly) detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Note |
|---|---|---|---|---|---|
|
C141C12 |
Brake Booster Motor "A" Control Circuit Short to Battery |
A short is detected in the motor relay drive circuit for 2 seconds or more. |
|
Comes on |
|
|
C141C14 |
Brake Booster Motor "A" Control Circuit Short to Ground or Open |
When the +BI1 voltage is between 7.3 and 16.6 V and the duty ratio of the pump motor is at 100%, the difference between the voltage at terminal MRI1 and the voltage at the pump motor is more than 1.5 V for 0.12 seconds or more. |
|
Comes on |
|
|
C141C1C |
Brake Booster Motor "A" Control Circuit Voltage Out of Range |
An open is detected in the motor relay drive circuit for 2 seconds or more. |
|
Comes on |
|
MONITOR DESCRIPTION
The No. 2 skid control ECU (brake actuator assembly) monitors the voltage of the pump motor.
When the pump motor is instructed to be on and the voltage of the pump motor is within the range of an open circuit malfunction (voltage value is practically equal to that when off), or when the pump motor is instructed to be off and the voltage of the pump motor is within the range of a short circuit malfunction (voltage value is practically equal to that when on), an open circuit or short circuit is judged respectively and the MIL is illuminated and stores a DTC.
MONITOR STRATEGY
|
Related DTCs |
C140F: Brake booster motor circuit open C141D: Brake booster motor open circuit C141E: Brake booster motor circuit high |
|
Required Sensors/Components(Main) |
No. 2 skid control ECU (brake actuator assembly) Brake booster with accumulator pump assembly |
|
Required Sensors/Components(Related) |
No. 2 skid control ECU (brake actuator assembly) Brake booster with accumulator pump assembly |
|
Frequency of Operation |
Continuous |
|
Duration |
0.12 seconds: C140F (Case 3) and C141D 2 seconds: C140F (Case 1) and C141E (Case 1) 2.004 seconds: C140F (Case 2) 4.002 seconds: C141E (Case 2 and 3) |
|
MIL Operation |
Immediately |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
C140F (Case 1)
|
Monitor runs whenever the following DTCs are not stored |
C110F: Brake system voltage circuit low C141C (Case 1): Brake booster motor relay output shorted high C141C (Case 2): Brake booster motor freewheeling MOS output shorted high C141C (Case 3 to 10): Brake booster motor gate voltage output functional C141D: Brake booster motor open circuit C141E: Brake booster motor circuit high C14C7 (Case 3 to 9): Brake system voltage circuit low C14C8: Brake system voltage circuit high |
|
All of the following conditions are met |
A, B and C |
|
A. Brake system voltage 1 |
Less than 23.2 V, and higher than 7.3 V |
|
B. Following conditions are met |
4 seconds or more |
|
Both of the following conditions are met |
- |
|
Motor duty output order value |
0% |
|
Motor fail-safe relay monitor |
On |
|
C. Motor fail judgment permission in current trip |
On |
C140F (Case 2)
|
Monitor runs whenever the following DTCs are not stored |
C110F: Brake system voltage circuit low C141C (Case 1): Brake booster motor relay output shorted high C141C (Case 2): Brake booster motor freewheeling MOS output shorted high C141C (Case 3 to 10): Brake booster motor gate voltage output functional C141D: Brake booster motor open circuit C141E: Brake booster motor circuit high C14C7 (Case 3 to 9): Brake system voltage circuit low C14C8: Brake system voltage circuit high |
|
All of the following conditions are met |
- |
|
Brake system voltage 1 |
Higher than 7.3 V, and less than 23.2 V |
|
MRI1 voltage |
5.7 V or more |
|
Motor relay input signal permission |
Off |
|
Command to motor relay |
Off |
|
Motor duty output order value |
0% |
|
Command to reverse battery protection MOS |
Off |
|
Command to motor fail-safe relay |
On |
C140F (Case 3)
|
Monitor runs whenever the following DTCs are not stored |
C110F: Brake system voltage circuit low C141C (Case 1): Brake booster motor relay output shorted high C141C (Case 2): Brake booster motor freewheeling MOS output shorted high C141C (Case 3 to 10): Brake booster motor gate voltage output functional C141D: Brake booster motor open circuit C141E: Brake booster motor circuit high C14C7 (Case 3 to 9): Brake system voltage circuit low C14C8: Brake system voltage circuit high |
|
All of the following conditions are met |
- |
|
Brake system voltage 1 |
Higher than 7.3 V, and less than 23.2 V |
|
MRI1 voltage |
5.7 V or more |
|
Motor relay input signal permission |
Off |
|
Command to motor relay |
Off |
|
Motor duty output order value |
0% |
|
Command to reverse battery protection MOS |
On |
|
Command to motor fail-safe relay |
Off |
C141D (Case 1)
|
Monitor runs whenever the following DTCs are not stored |
C110F: Brake system voltage circuit low C140F: Brake booster motor circuit open C141C (Case 1): Brake booster motor relay output shorted high C141C (Case 2): Brake booster motor freewheeling MOS output shorted high C141C (Case 3 to 10): Brake booster motor gate voltage output functional C141E: Brake booster motor circuit high C14C7 (Case 3 to 9): Brake system voltage circuit low C14C8: Brake system voltage circuit high C14CA: Brake system voltage open circuit |
|
All of the following conditions are met |
- |
|
Brake system voltage 1 |
Less than 23.2 V, and higher than 7.3 V |
|
Motor fail-safe relay output monitor |
On |
|
Output duty order value (command to motor relay port) |
100% |
|
Motor fail judgment permission in current trip |
On |
C141D (Case 2)
|
Monitor runs whenever the following DTCs are not stored |
C110F: Brake system voltage circuit low C140F: Brake booster motor circuit open C141C (Case 1): Brake booster motor relay output shorted high C141C (Case 2): Brake booster motor freewheeling MOS output shorted high C141C (Case 3 to 10): Brake booster motor gate voltage output functional C141E: Brake booster motor circuit high C14C7 (Case 3 to 9): Brake system voltage circuit low C14C8: Brake system voltage circuit high C14CA: Brake system voltage open circuit |
|
All of the following conditions are met |
- |
|
Brake system voltage 1 |
Higher than 7.3 V, and less than 23.2 V |
|
MRI1 voltage |
5.7 V or more |
|
Motor relay input signal permission |
On |
|
Command to motor relay |
On |
|
Motor duty output order value |
100% |
|
Command to reverse battery protection MOS |
Off |
|
Command to motor fail-safe relay |
Off |
C141E (Case 1)
|
Monitor runs whenever the following DTCs are not stored |
C110F: Brake system voltage circuit low C140F: Brake booster motor circuit open C141C (Case 1): Brake booster motor relay output shorted high C141C (Case 2): Brake booster motor freewheeling MOS output shorted high C141C (Case 3 to 10): Brake booster motor gate voltage output functional C141D: Brake booster motor open circuit C14C7 (Case 3 to 9): Brake system voltage circuit low C14C8: Brake system voltage circuit high |
|
All of the following conditions are met |
A, B and C |
|
A. Brake system voltage 1 |
Less than 23.2 V, and higher than 7.3 V |
|
B. Following conditions are met |
4 seconds or more |
|
Both of the following conditions are met |
- |
|
Motor duty output order value |
0% |
|
Motor fail-safe relay monitor |
On |
|
C. Motor fail judgment permission in current trip |
On |
C141E (Case 2)
|
Monitor runs whenever the following DTCs are not stored |
C110F: Brake system voltage circuit low C140F: Brake booster motor circuit open C141C (Case 1): Brake booster motor relay output shorted high C141C (Case 2): Brake booster motor freewheeling MOS output shorted high C141C (Case 3 to 10): Brake booster motor gate voltage output functional C141D: Brake booster motor open circuit C14C7 (Case 3 to 9): Brake system voltage circuit low C14C8: Brake system voltage circuit high |
|
All of the following conditions are met |
- |
|
Brake system voltage 1 |
Less than 23.2 V |
|
MRI1 voltage |
5.7 V or more |
|
Motor relay input signal permission |
Off |
|
Command to motor relay |
On |
|
Motor duty output order value |
100% |
|
Command to reverse battery protection MOS |
Off |
|
Command to motor fail-safe relay |
Off |
C141E (Case 3)
|
Monitor runs whenever the following DTCs are not stored |
C110F: Brake system voltage circuit low C140F: Brake booster motor circuit open C141C (Case 1): Brake booster motor relay output shorted high C141C (Case 2): Brake booster motor freewheeling MOS output shorted high C141C (Case 3 to 10): Brake booster motor gate voltage output functional C141D: Brake booster motor open circuit C14C7 (Case 3 to 9): Brake system voltage circuit low C14C8: Brake system voltage circuit high |
|
All of the following conditions are met |
- |
|
Brake system voltage 1 |
Less than 23.2 V |
|
MRI1 voltage |
5.7 V or more |
|
Motor relay input signal permission |
Off |
|
Command to motor relay |
Off |
|
Motor duty output order value |
0% |
|
Command to reverse battery protection MOS |
Off |
|
Command to motor fail-safe relay |
Off |
TYPICAL MALFUNCTION THRESHOLDS
C140F (Case 1)
|
High side voltage of motor |
3.0 V or more and 6.1 V or less |
C140F (Case 2 and 3)
|
High side voltage of motor |
Higher than 3.0 V |
C141D (Case 1)
|
Difference between the MRI1 voltage and high side voltage of motor |
Higher than 1.5 V |
C141D (Case 2)
|
High side voltage of motor |
Less than difference between MRI1 and 1.5 V |
C141E (Case 1)
|
High side voltage of motor |
Higher than 6.1 V |
C141E (Case 2 and 3)
|
High side voltage of motor |
3.0 V or less or 6.1 V or more |
COMPONENT OPERATING RANGE
C140F (Case 1) and C141E (Case 1)
|
All of the following conditions are met |
A, B, C, D and E |
|
A. Brake system voltage 1 |
Less than 23.2 V, and higher than 7.3 V |
|
B. Following conditions are met |
4 seconds or more |
|
Both of the following conditions are met |
- |
|
Motor duty output order value |
0% |
|
Motor fail-safe relay monitor |
On |
|
C. All of the following conditions are met at the ECU status (last IG ON timing final) |
- |
|
Brake system voltage fail (C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C, C141D, C141E, C141F) |
Not detected |
|
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) |
Not detected |
|
D. All of the following conditions are met at the ECU status (pre main) |
- |
|
Brake system voltage fail (C121F, C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C) |
Not detected |
|
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) |
Not detected |
|
E. High side voltage of motor |
Less than 3.0 V |
C140F (Case 2)
|
All of the following conditions are met |
A, B, C, D, E, F, G, H, I and J |
|
A. Brake system voltage 1 |
Higher than 7.3 V, and less than 23.2 V |
|
B. MRI1 voltage |
5.7 V or more |
|
C. Motor relay input signal permission |
Off |
|
D. Command to motor relay |
Off |
|
E. Motor duty output order value |
0% |
|
F. Command to reverse battery protection MOS |
Off |
|
G. Command to motor fail-safe relay |
On |
|
H. All of the following conditions are met at the ECU status (last IG ON timing final) |
- |
|
Brake system voltage fail (C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C, C141D, C141E, C141F) |
Not detected |
|
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) |
Not detected |
|
I. All of the following conditions are met at the ECU status (pre main) |
- |
|
Brake system voltage fail (C121F, C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C) |
Not detected |
|
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) |
Not detected |
|
J. High side voltage of motor |
Less than 3.0 V |
C140F (Case 3)
|
All of the following conditions are met |
A, B, C, D, E, F, G, H, I and J |
|
A. Brake system voltage 1 |
Higher than 7.3 V, and less than 23.2 V |
|
B. MRI1 voltage |
5.7 V or more |
|
C. Motor relay input signal permission |
Off |
|
D. Command to motor relay |
Off |
|
E. Motor duty output order value |
0% |
|
F. Command to reverse battery protection MOS |
On |
|
G. Command to motor fail-safe relay |
Off |
|
H. All of the following conditions are met at the ECU status (last IG ON timing final) |
- |
|
Brake system voltage fail (C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C, C141D, C141E, C141F) |
Not detected |
|
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) |
Not detected |
|
I. All of the following conditions are met at the ECU status (pre main) |
- |
|
Brake system voltage fail (C121F, C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C) |
Not detected |
|
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) |
Not detected |
|
J. High side voltage of motor |
Less than 3.0 V |
C141D (Case 1)
|
All of the following conditions are met |
A, B, C, D, E and F |
|
A. Brake system voltage 1 |
Less than 23.2 V, and higher than 7.3 V |
|
B. Motor fail-safe relay output monitor |
On |
|
C. Output duty order value (command to motor relay port) |
100% |
|
D. All of the following conditions are met at the ECU status (last IG ON timing final) |
- |
|
Brake system voltage fail (C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C, C141D, C141E, C141F) |
Not detected |
|
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) |
Not detected |
|
E. All of the following conditions are met at the ECU status (pre main) |
- |
|
Brake system voltage fail (C121F, C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C) |
Not detected |
|
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) |
Not detected |
|
F. Difference between the MRI1 voltage and high side voltage of motor |
1.5 V or less |
C141D (Case 2)
|
All of the following conditions are met |
A, B, C, D, E, F, G, H, I and J |
|
A. Brake system voltage 1 |
Higher than 7.3 V, and less than 23.2 V |
|
B. MRI1 voltage |
5.7 V or more |
|
C. Motor relay input signal permission |
On |
|
D. Command to motor relay |
On |
|
E. Motor duty output order value |
100% |
|
F. Command to reverse battery protection MOS |
Off |
|
G. Command to motor fail-safe relay |
Off |
|
H. All of the following conditions are met at the ECU status (last IG ON timing final) |
- |
|
Brake system voltage fail (C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C, C141D, C141E, C141F) |
Not detected |
|
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) |
Not detected |
|
I. All of the following conditions are met at the ECU status (pre main) |
- |
|
Brake system voltage fail (C121F, C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C) |
Not detected |
|
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) |
Not detected |
|
J. Difference between the MRI1 voltage and high side voltage of motor |
1.5 V or less |
C141E (Case 2)
|
All of the following conditions are met |
A, B, C, D, E, F, G, H, I and J |
|
A. Brake system voltage 1 |
Less than 23.2 V |
|
B. MRI1 voltage |
5.7 V or more |
|
C. Motor relay input signal permission |
Off |
|
D. Command to motor relay |
On |
|
E. Motor duty output order value |
100% |
|
F. Command to reverse battery protection MOS |
Off |
|
G. Command to motor fail-safe relay |
Off |
|
H. All of the following conditions are met at the ECU status (last IG ON timing final) |
- |
|
Brake system voltage fail (C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C, C141D, C141E, C141F) |
Not detected |
|
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) |
Not detected |
|
I. All of the following conditions are met at the ECU status (pre main) |
- |
|
Brake system voltage fail (C121F, C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C) |
Not detected |
|
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) |
Not detected |
|
J. High side voltage of motor |
Less than 3.0 V |
C141E (Case 3)
|
All of the following conditions are met |
A, B, C, D, E, F, G, H, I and J |
|
A. Brake system voltage 1 |
Less than 23.2 V |
|
B. MRI1 voltage |
5.7 V or more |
|
C. Motor relay input signal permission |
Off |
|
D. Command to motor relay |
Off |
|
E. Motor duty output order value |
0% |
|
F. Command to reverse battery protection MOS |
Off |
|
G. Command to motor fail-safe relay |
Off |
|
H. All of the following conditions are met at the ECU status (last IG ON timing final) |
- |
|
Brake system voltage fail (C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C, C141D, C141E, C141F) |
Not detected |
|
Brake pressure control solenoid fail (C14F4, C14FD, C150A, C1510) |
Not detected |
|
I. All of the following conditions are met at the ECU status (pre main) |
- |
|
Brake system voltage fail (C121F, C12FA, C12FB) |
Not detected |
|
Brake booster motor fail (C141C) |
Not detected |
|
Brake pressure control solenoid fail (C14F3, C14F4, C14FC, C14FD, C1509, C150A, C150F, C1510) |
Not detected |
|
J. High side voltage of motor |
Less than 3.0 V |
CONFIRMATION DRIVING PATTERN
NOTICE:
When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.
HINT:
- After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
- Connect the GTS to the DLC3.
- Turn the ignition switch to ON and turn the GTS on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off.
- Turn the ignition switch to ON (READY) and turn the GTS on.
- Depress the brake pedal several times until the pump motor operates. [*1]
-
Wait 5 seconds. [*2]
HINT:
[*1] to [*2]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Enter the following menus: Chassis / Brake/EPB / Utility / All Readiness.
-
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform driving pattern again.
WIRING DIAGRAM
Refer to DTC C059400.
Click here
![2022 - 2023 MY RAV4 RAV4 HV [12/2021 - 10/2023]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C059400; Brake Booster Motor "A" Performance](/t3Portal/stylegraphics/info.gif)
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
After replacing the No. 1 skid control ECU (brake booster with master cylinder assembly), perform "Calibration" after performing "Reset Memory".
Click here
PROCEDURE
|
1. |
CHECK DTC |
(a) Check the DTCs that are output.
Chassis > Brake Booster > Trouble Codes
Chassis > Brake/EPB > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs C141C12, C141C14 and/or C141C1C are output. |
A |
|
DTCs other than C141C12, C141C14 and C141C1C are output. |
B |
| B |
|
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
|
2. |
READ VALUE USING GTS (MOTOR RELAY) |
(a) Depress the brake pedal several times and check the operation status of the motor relay.
Chassis > Brake Booster > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
ECB Motor Relay |
Motor relay operation request |
OFF / ON |
OFF: Relay off ON: Relay on |
ECB: Electronically Controlled Brake System |
Chassis > Brake Booster > Data List
|
Tester Display |
|---|
|
ECB Motor Relay |
HINT:
Depressing the brake pedal several times drops the accumulator pressure and operates the pump motor.
|
Result |
Proceed to |
|---|---|
|
The status of motor relay in the Data List turns on and off after depressing the brake pedal several times. |
A |
|
The status of motor relay in the Data List does not change even after depressing the brake pedal several times. |
B |
| B |
|
|
|
3. |
INSPECT BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY |
|
(a) Turn the ignition switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the A106 brake booster with accumulator pump assembly connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (BM1) - 2 (GND1) |
Always |
10 Ω or less |
| NG |
|
REPLACE BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY
|
|
|
4. |
CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A104 No. 1 skid control ECU (brake booster with master cylinder assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A106-2 (GND1) - A104-30 (M-) |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
READ VALUE USING GTS (ACCUMULATOR PRESSURE) |
(a) Reconnect the A106 brake booster with accumulator pump assembly connector.
(b) Reconnect the A104 No. 1 skid control ECU (brake booster with master cylinder assembly) connector.
(c) Disconnect the A103 brake pedal stroke sensor assembly connector.
(d) Depress the brake pedal several times to operate the pump motor, then wait until it stops.
(e) After the pump motor stops, wait for 30 seconds, then check the drop in the accumulator pressure sensor output value and the state of the pump motor.
Chassis > Brake Booster > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
ECB Motor Relay |
Motor relay operation request |
OFF / ON |
OFF: Relay off ON: Relay on |
ECB: Electronically Controlled Brake System |
|
Accumulator Pressure |
Accumulator pressure output value |
Min.: 0.00 MPa Max.: 24.48 MPa |
15.00 to 21.00 MPa (Pressure stable and pump motor stopped) |
When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator |
Chassis > Brake Booster > Data List
|
Tester Display |
|---|
|
ECB Motor Relay |
|
Accumulator Pressure |
HINT:
- This inspection checks whether an accumulator pressure sensor malfunction, internal brake booster with master cylinder assembly leak or prolonged operation due to detection of low pressure caused by accumulator deterioration, caused the DTC to be stored.
- If the brake fluid level in the brake fluid level warning switch (brake booster with master cylinder assembly) drops, an external brake fluid leak is suspected.
|
Result |
Proceed to |
|---|---|
|
The drop in the accumulator pressure sensor output value is less than 2.50 MPa 30 seconds after the pump motor stops, and the pump motor does not operate within 30 seconds after the pump motor stops. |
A |
|
The drop in the accumulator pressure sensor output value is 2.50 MPa or more 30 seconds after the pump motor stops, or the pump motor operates within 30 seconds after the pump motor stops. |
B |
| B |
|
|
|
6. |
CLEAR DTC |
(a) Turn the ignition switch off.
(b) Reconnect the A103 brake pedal stroke sensor assembly connector.
(c) Clear the DTCs.
Chassis > Brake Booster > Clear DTCs
(d) Turn the ignition switch off.
|
|
7. |
RECONFIRM DTC |
(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(b) Check if the same DTC is output.
Chassis > Brake Booster > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs C141C12, C141C14 and C141C1C are not output. |
A |
|
DTCs C141C12, C141C14 and/or C141C1C are output. |
B |
| A |
|
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
|
8. |
READ VALUE USING GTS (ACCUMULATOR PRESSURE) |
(a) Turn the ignition switch off.
(b) Reconnect the A103 brake pedal stroke sensor assembly connector.
(c) Drive the linear solenoid (SLA) by performing the Active Test to reduce the accumulator pressure.
HINT:
Perform the Active Test with the current set to maximum.
(d) After reducing the accumulator pressure, confirm that the pump motor starts and the accumulator pressure returns to 15.00 to 21.00 MPa.
Chassis > Brake Booster > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Restrict Condition |
Diagnostic Note |
|---|---|---|---|---|
|
ECB Solenoid (SLA) |
Linear solenoid addition valve (SLA) |
Solenoid Start (Activate) Solenoid SLA (It is possible to set the current) |
Vehicle condition:
|
ECB: Electronically Controlled Brake System |
Chassis > Brake Booster > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Accumulator Pressure |
Accumulator pressure output value |
Min.: 0.00 MPa Max.: 24.48 MPa |
15.00 to 21.00 MPa (Pressure stable and pump motor stopped) |
When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator |
Chassis > Brake Booster > Active Test
|
Active Test Display |
|---|
|
ECB Solenoid (SLA) |
|
Data List Display |
|---|
|
Accumulator Pressure |
OK:
The accumulator pressure reduces, and then returns to 15.00 to 21.00 MPa when the pump motor operates.
| NG |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
|
|
9. |
RECONFIRM DTC |
(a) Confirm that the pump motor inside the brake booster with accumulator pump assembly is stopped.
(b) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(c) Check if the same DTC is output.
Chassis > Brake Booster > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs C141C12, C141C14 and C141C1C are not output. |
A |
|
DTCs C141C12, C141C14 and/or C141C1C are output. |
B |
| A |
|
| B |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
|
10. |
CHECK HARNESS AND CONNECTOR (MRI1 TERMINAL) |
|
(a) Turn the ignition switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the A104 No. 1 skid control ECU (brake booster with master cylinder assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A104-1 (MRI1) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
11. |
CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A106 brake booster with accumulator pump assembly connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A104-29 (M+) - A106-1 (BM1) |
Always |
Below 1 Ω |
|
A104-29 (M+) or A106-1 (BM1) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|