DTC C1252/52: Brake Booster Pump Motor on Time Abnormally Long; DTC C1253/53: Pump Motor Relay Malfunction [08/2013 - ]: Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
The skid control ECU (brake booster with master cylinder assembly) detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay.
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1252/52 | 311 | The pump motor is operating continuously for 178 seconds or more. (When relay is malfunctioning for 98 seconds or more.) |
|
| C1253/53 | 321 | With the IG1 terminal voltage 9.5 V or more, the motor drive monitor remains off for 0.2 seconds or more after a motor drive on request. |
|
| ↑ | 322 | The motor drive monitor remains on for 2 seconds or more after a motor drive off request. |
|
| ↑ | 323 | The skid control ECU (brake booster with master cylinder assembly) internal motor drive logical inconsistency continues for 2 seconds or more. | Skid control ECU (Brake booster with master cylinder assembly) |
| ↑ | 324 | An open circuit is detected in both skid control ECU (brake booster with master cylinder assembly) internal motor relays 1 and 2. |
|
| ↑ | 325 | An open circuit is detected in both skid control ECU (brake booster with master cylinder assembly) internal motor relays 1 and 3. | ↑ |
| ↑ | 326 | An open circuit is detected in both skid control ECU (brake booster with master cylinder assembly) internal motor relays 2 and 3. | ↑ |
| ↑ | 327 | An open circuit is detected in skid control ECU (brake booster with master cylinder assembly) internal motor relay 1. | ↑ |
| ↑ | 328 | An open circuit is detected in skid control ECU (brake booster with master cylinder assembly) internal motor relay 2. | ↑ |
| ↑ | 329 | An open circuit is detected in skid control ECU (brake booster with master cylinder assembly) internal motor relay 3. | ↑ |