Toyota Camry (XV70): Brake System Control Module "A" System Voltage System Voltage High (C137BA3)
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. | Detection Item |
DTC Detection Condition | Trouble Area |
|---|---|---|---|
|
C137BA3 | Brake System Control Module "A" System Voltage System Voltage High |
+BS terminal voltage is more than 16.5 V for 1 second or more. |
|
WIRING DIAGRAM
Refer to DTC C137BA2
Click here
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CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and system information memorization.
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PROCEDURE
| 1. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) |
| (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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(b) Disconnect the A34 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 | Condition |
Specified Condition |
|---|---|---|
|
A34-30 (+BS) - Body ground |
Always | 11 to 14 V |
| OK | .gif) | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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DESCRIPTION When any of the following conditions are met, the skid control ECU (brake actuator assembly) sets the drive output (STPO) ON which operates the stop light control relay (stop light switch
Stop Lamp Relay Actuator Stuck Off (C13807F)
DESCRIPTION Refer to DTC C13807E. Click here
DTC No. Detection Item
DTC Detection Condition Trouble Area
C13807F Stop Lamp Relay Actuator Stuck Off
When the voltage
Brake Pressure Control Solenoid "A" Control Circuit Short to Battery (C13C012,...,C13C949)
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Depending on the operating conditions, the master cylinder cut solenoid valves
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Parking Support Brake function - PKSB (Parking Support
Brake)
If the Parking Support Brake detects that a collision with an object is
possible, the engine output will be restricted to restrain any increase
in the vehicle speed. (Engine output restriction control: See A below.)
Additionally, if the accelerator pedal continues to be depressed, the
brakes wil
Components
COMPONENTS ILLUSTRATION
*A for 2WD
*B for AWD
*1 IGNITION COIL ASSEMBLY
*2 NO. 1 ENGINE COVER SUB-ASSEMBLY
*3 SPARK PLUG
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N*m (kgf*cm, ft.*lbf): Specified torque
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