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### DTC C1251/51 Open in Pump Motor Circuit

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## DESCRIPTION

The ABS pump motor is located inside the brake actuator.

DTC No. | DTC Detection Condition | Trouble Area

C1251/51

When one of following conditions is met:

1. Actuator pump motor does not operate properly
2. Actuator pump motor circuit remains open for at least 2 seconds

1. Brake actuator
2. Brake actuator circuit

## WIRING DIAGRAM

## INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY)

1. Select the Active Test, generate a control command, and then check that the ABS motor relay operates.

Skid control ECU:
Item | Vehicle Condition / Test Details | Diagnostics Note
ABS Motor Relay | Turn ABS motor relay ON / OFF | Operation sound of motor can be heard

OK:
  Operation sound of ABS motor is heard.

| OK |

REPLACE BRAKE ACTUATOR ASSEMBLY

NG |

2.CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)

1. Disconnect the S2 ECU connector.

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     S2-2 (GND1) - Body ground | Below 1 Ω
     S2-24 (GND2) - Body ground | Below 1 Ω

1. Measure the voltage of the wire harness side connector.

   Standard voltage:

     Tester Connection | Specified Condition
     S2-23 (+BM) - Body ground | 10 to 14 V

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

REPLACE BRAKE ACTUATOR ASSEMBLY