Toyota Corolla Cross: Electronic Brake Booster Control Module "A" Backup Power Supply Voltage System Voltage Low (C125DA2,C125DA3)
DESCRIPTION
The brake control power supply assembly is used as an auxiliary power supply for brake control when the voltage of the auxiliary battery is low.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
DTC Output from |
Note |
|---|---|---|---|---|---|---|
|
C125DA2 |
Electronic Brake Booster Control Module "A" Backup Power Supply Voltage System Voltage Low |
Voltage from brake control power supply assembly is less than 2.8 V for 10 seconds. |
|
Does not come on |
Brake Booster |
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
|
C125DA3 |
Electronic Brake Booster Control Module "A" Backup Power Supply Voltage System Voltage High |
Brake control power supply assembly power source voltage is abnormal for 10 seconds or more. |
|
Does not come on |
Brake Booster |
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
WIRING DIAGRAM
Refer to DTC C121F87.
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CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (+BC TERMINAL) |
|
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the O223 brake control power supply assembly connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O223-1 (+BC) - Body ground |
Always |
11 to 14 V |
| NG | .gif)
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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|
2. |
CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the O223 brake control power supply 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 |
|---|---|---|
|
O223-4 (GND) - Body ground |
1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE CONTROL POWER SUPPLY ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A189 electric brake booster (brake booster with master cylinder assembly) connector.
(c) Disconnect the O223 brake control power supply 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 |
|---|---|---|
|
A189-1 (CBKP) - O223-6 (OUT) |
Always |
Below 1 Ω |
|
A189-1 (CBKP) or O223-6 (OUT) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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DESCRIPTION
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DT
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SEE MORE:
Installation
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89448D
- -
2 INSPECT FOR ENGINE OIL LEAK
- -
- -
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