Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001D2KT |
Model Year Start: 2019 |
Model: GR Corolla |
Prod Date Range: [06/2018 - 09/2022] |
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): C137BA3; Brake System Control Module "A" System Voltage System Voltage High; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022] |
DTC
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C137BA3
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Brake System Control Module "A" System Voltage System Voltage High
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DESCRIPTION
If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.
This DTC is stored when the +BS terminal voltage deviates due to a malfunction in a power supply or charging system circuit such as the battery or alternator circuit, etc.
DTC No.
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Detection Item
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DTC Detection Condition
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Trouble Area
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C137BA3
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Brake System Control Module "A" System Voltage System Voltage High
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+BS terminal voltage is more than 16.5 V for 1 second or more.
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-
Power source circuit
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Internal power supply circuit of the skid control ECU (brake actuator assembly)
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WIRING DIAGRAM
Refer to DTC C137BA2
Click here
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
Click here
PROCEDURE
1.
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CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)
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(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.
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*a
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Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly))
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|
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(b) Disconnect the A51 skid control ECU (brake actuator 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
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Condition
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Specified Condition
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A51-30 (+BS) - Body ground
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Always
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11 to 14 V
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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