DTC C1257/57 Power Supply Drive Circuit
Description
The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.
| DTC Code | DTC Detection Condition | Trouble Area |
| C1257/57 | There is an open in the motor system circuit (motor input circuit). | Hydraulic brake booster pump motor circuit |
Inspection procedure
NOTICE:
When replacing the master cylinder solenoid, perform zero point calibration .
| 1.CHECK PUMP MOTOR OPERATION |
-
Turn the ignition switch off.
-
Disconnect the A24 skid control ECU connector.
-
Depress the brake pedal more than 20 times.
-
Turn the ignition switch to ON.
-
Check pump motor operation.
OK:
Pump motor normally operates.
Result Result Proceed to OK A NG LHD B RHD C
|
|
||||
|
|
||||
| A | |
| 2.RECONFIRM DTC |
-
Turn the ignition switch off.
-
Reconnect the A24 skid control ECU connector.
-
Turn the ignition switch to ON.
-
Clear the DTC .
-
Check if the same DTC is output .
Result Result Proceed to DTC is not output A DTC is output LHD B RHD C
|
|
||||
|
|
||||
| A | |
|