| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM10000000214R0 |
| 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): C14C9A2; Electronic Brake Booster Control Module "A" System Voltage Low; 2022 - 2024 MY RAV4 RAV4 HV [12/2021 - ] | ||
|
DTC |
C14C9A2 |
Electronic Brake Booster Control Module "A" System Voltage Low |
DESCRIPTION
Refer to DTC C110E14.
Click here
![2022 - 2024 MY RAV4 RAV4 HV [12/2021 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C110E14; Brake Booster Motor "A" Supply Voltage Circuit Short to Ground or Open+](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Note |
|---|---|---|---|---|---|
|
C14C9A2 |
Electronic Brake Booster Control Module "A" System Voltage Low |
The voltage of terminal +BI1 is less than 7.3 V and the pump motor is being driven, the output of the pump motor is excessively low for 1 second or more. |
|
Comes on |
|
MONITOR DESCRIPTION
When the output of the pump motor is excessively low due to voltage of VM1 being excessively low, the No. 2 skid control ECU (brake actuator assembly) judges that there is a drop in the supplied voltage, the MIL is illuminated and a DTC is stored.
MONITOR STRATEGY
|
Related DTCs |
C14CA: Brake system voltage open circuit |
|
Required Sensors/Components(Main) |
No. 2 skid control ECU (brake actuator assembly) |
|
Required Sensors/Components(Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
1 second |
|
MIL Operation |
Immediately |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
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 1 and 2): Brake system voltage circuit low C052D: ABS pump motor circuit high C052E: ABS pump motor open circuit C055B: ABS pump motor voltage circuit low |
TYPICAL MALFUNCTION THRESHOLDS
|
Following conditions are met |
0.054 seconds or more |
|
Brake system voltage 1 |
7.3 V or less |
|
Motor relay overcurrent state |
On |
|
Judgment permission having poor motor output by the power supply voltage drop |
On |
COMPONENT OPERATING RANGE
|
Brake system voltage 1 |
Higher than 7.3 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.
-
Wait for 1 second or more. [*]
HINT:
[*]: 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 C110E14.
Click here
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
Before performing troubleshooting, make sure to confirm that the auxiliary battery voltage is normal.
Click here
-
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 |
|---|---|
|
Only DTC C14C9A2 is output. |
A |
|
DTCs other than C14C9A2 are output. |
B |
| B |
|
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
|
2. |
READ VALUE USING GTS (+BI1 VOLTAGE) |
(a) Drive the pump motor by performing the Active Test.
HINT:
-
The pump motor can be driven by performing the Active Test for ECB* solenoid (SLA).
*: Electronically Controlled Brake System
- Perform the Active Test with the current set to maximum.
(b) Monitor the value of Data List item +BI1 Voltage when the pump motor is being driven.
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 |
|---|---|---|---|---|
|
BI Voltage |
+BI1 voltage value |
Min.: 0.000 V Max.: 20.000 V |
- |
Changes in proportion to auxiliary battery voltage |
Chassis > Brake Booster > Active Test
|
Active Test Display |
|---|
|
ECB Solenoid (SLA) |
|
Data List Display |
|---|
|
BI Voltage |
|
Result |
Proceed to |
|---|---|
|
+BI1 voltage is 11 to 14 V. |
A |
|
+BI1 voltage is below 11 V. |
B |
| A |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (+BI1 AND 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 |
|---|---|---|
|
A104-14 (+BI1) - Body ground |
Always |
11 to 14 V |
|
A104-1 (MRI1) - Body ground |
Always |
11 to 14 V |
|
Result |
Proceed to |
|---|---|
|
11 to 14 V. |
A |
|
Below 11 V. |
B |
| A |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
| B |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|