ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1257/57
| DTC Code | DTC Name |
|---|---|
| C1257/57 | Power Supply Drive Circuit |
DESCRIPTION
The skid control ECU detects a drop in accumulator pressure according to the signals from the accumulator pressure sensor, then operates and stops the motor relay as well as the pump motor.
The skid control ECU troubleshoots the built-in motor relay drive circuit, and stores this DTC when a malfunction is detected.
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1257/57 | 361 | While accumulator pressure falls below hard pump ON pressure, the hard drive circuit does not operate for 1 second or more. | Skid control ECU (Brake booster with master cylinder assembly) |
| ↑ | 362 | When hard driving, one of the 3 built-in motor relays does not operate for 0.2 seconds or more. | ↑ |
INSPECTION PROCEDURE
Note
When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve Click here.
Tech Tips
When C1241/41, C1242/42 and/or C1253/53 are output together with C1257/57, inspect and repair the trouble areas indicated by C1241/41, C1242/42 and/or C1253/53 first Click here or Click here.
PROCEDURE
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REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
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Replace the skid control ECU (brake booster with master cylinder assembly) Click here.
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