DESCRIPTION
INSPECTION PROCEDURE
CHECK PUMP MOTOR OPERATION
RECONFIRM DTC
DTC C1257 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 (master cylinder solenoid).
| DTC Code | DTC Detection Condition | Trouble Area |
| C1257 | There is an open in the motor system circuit (motor input circuit). | Skid control ECU (Master cylinder solenoid) |
INSPECTION PROCEDURE
- After 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 (master cylinder solenoid) connector.
Depress the brake pedal more than 40 times.
Turn the ignition switch to ON.
Check pump motor operation.
- OK:
- Pump motor operates normally.
Result| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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Turn the ignition switch off.
Reconnect the A24 skid control ECU (master cylinder solenoid) connector.
Turn the ignition switch to ON.
Turn the ignition switch off.
Check if the same DTC is output ().
Result| Result | Proceed to |
| DTC is not output | A |
| DTC is output (for LHD) | B |
| DTC is output (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| CHECK FOR INTERMITTENT PROBLEMS ()
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