Toyota Sienna Quiz
Brake control

Open in Pump Motor Circuit

In this manual: Brake control
Introduction — 55Service specifications — 7Maintenance — 7Engine — 264U151e automatic transaxle — 108Transfer — 19Propeller shaft — 8Drive shaft — 14Differential — 16Axle — 18Suspension — 37Tire and wheel — 54Brake control — 141Parking brake — 16Steering Column — 11Power steering — 18Air conditioning — 106Supplemental restraint system — 146Seat belt — 22Theft deterrent — 14Engine immobiliser — 17Cruise control — 65Lighting — 61Wiper and washer — 13Door lock — 42Meter — 28Audio / visual — 94Navigation — 108Park assist / monitoring — 33Horn — 5Garage door opener — 42GR-FE Engine control system — 126Supplemental restraint system — 147Other system — 14Windshield / windowglass — 43Mirror — 23Instrument panel — 6Seat belt — 22Seat — 92Engine hood / door — 104Exterior — 39Interior — 5Sliding roof — 9Multiplex communication — 18Can communication — 23
~2min read

DTC C1251/51 Open in Pump Motor Circuit

DESCRIPTION

The motor relay (semiconductor relay) is housed in the brake actuator assembly and drives the pump motor based on a signal from the skid control ECU.

Open in Pump Motor Circuit

WIRING DIAGRAM

Refer to DTCs C0273/13 and C0274/14 (See page BC-31).

INSPECTION PROCEDURE

HINT: After step 1 is complete, start the inspection from step 2 when using the intelligent tester, and from step 3 when not using the intelligent tester.

1 INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

(a) Disconnect the skid control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

2 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY)

(a) Reconnect the skid control ECU connector.

(b) Connect the intelligent tester to the DLC3.

(c) Turn the ignition switch to the ON position and turn the intelligent tester main switch on.

(d) Start the engine.

(e) Select the ACTIVE TEST mode on the intelligent tester.

ABS:

(f) Check operating sound of the ABS motor when operating it with the intelligent tester.

OK: The operating sound of the ABS motor is heard.

3 RECONFIRM DTC

(a) Clear the DTCs (See page BC-10).

(b) Start the engine.

(c) Drive the vehicle at the speed of 6 km/h or more.

(d) Check that the same DTC is recorded (See page BC- 10).

HINT:

  • Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.
  • If a speed signal of 6 km/h or more is input to the skid control ECU, with the ignition switch on and the stop light switch off, the ECU performs selfdiagnosis of the motor and solenoid circuits.

Result

HINT:

  • If any DTCs are output while jiggling a connector or wire harness of the brake actuator (skid control ECU), inspect and repair the connector or wire harness.
  • If the normal system code is output, slightly jiggle the connectors, wire harnesses, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
  • These DTCs may be stored due to a malfunction in the connector terminal connection, etc.

REPLACE BRAKE ACTUATOR ASSEMBLY

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