Dtc C1427 Motor Malfunction

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)

INSPECT SKID CONTROL ECU (GND2 TERMINAL)

RECONFIRM DTC

DTC C1427 Motor Malfunction


DESCRIPTION


DTC Code
DTC Detection Condition
Trouble Area
C1427
Actuator pump motor does not operate properly.
  1. Brake actuator assembly (Ground circuit)
  2. Brake actuator assembly (Motor circuit)

WIRING DIAGRAM

Refer to DTCs C0273, C0274 and C1361 (YARIS_NCP93 RM000001JD609BX.html).

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR06QX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)

  1. Connect the Techstream to the DLC3.

  1. Start the engine.

  1. Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

    ABS/VSC/TRAC (Skid Control ECU)
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Motor Relay
    		ABS motor relay
    		Relay ON / OFF
    		Operating sound of motor can be heard

  1. Check for operating sound of the ABS motor relay when operating it with the Techstream.

    Result
    Result
    		Proceed to
    Operating sound is not heard
    		A
    Operating sound is heard
    		B


B
Go to step 3
A


2.INSPECT SKID CONTROL ECU (GND2 TERMINAL)

  1. Turn the ignition switch off.

  1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.



    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1427 Motor Malfunction

  1. Disconnect the A30 skid control ECU connector.

    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Skid Control ECU)

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A30-13 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)
OK


3.RECONFIRM DTC
HINT:
This code is detected when a problem is identified in the brake actuator assembly.
The ABS motor relay is in the brake actuator assembly.
Therefore, ABS motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.

  1. Turn the ignition switch off.

  1. Reconnect the skid control ECU connector.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0BQX.html).

  1. Start the engine.

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

  1. Check if the same DTC is recorded (YARIS_NCP93 RM000000XHV0BQX.html).

    Result
    Result
    		Proceed to
    DTC (C1427) is not output
    		A
    DTC (C1427) is output
    		B
    HINT:
    1. If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU with the ignition switch ON and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
    2. If the normal system code is output (no trouble codes are output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
    3. If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness.
    4. The DTCs were probably output due to a bad connection of the connector terminal.


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS09YX.html)