Toyota Corolla Cross: 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 auxiliary 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 C117A49
Click here .gif)
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
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. |
|
(b) Disconnect the A151 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 |
|---|---|---|
|
A151-30 (+BS) - Body ground |
Always |
11 to 14 V |
| OK | .gif)
|
REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
