Toyota CH-R Service Manual: Motor Circuit Malfunction (C1428)

Toyota CH-R Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Motor Circuit Malfunction (C1428)

DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) judges that an abnormality occurred in the circuit used to operate the pump motor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1428

Motor Circuit Malfunction

A malfunction occurs in the pump motor circuit.

Pump motor circuit

WIRING DIAGRAM

Refer to DTC C146C.

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the skid control ECU (brake actuator assembly), perform system variant learning.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (+BM TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-1 (+BM) - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)
OK

2.

CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-14 (GND2) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)
OK

3.

RECONFIRM DTC

(a) Reconnect the A42 skid control ECU (brake actuator assembly) connector.

(b) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(c) Turn the ignition switch off.

(d) Start the engine.

(e) Perform a road test.

(f) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result

Proceed to

DTC C1428 is not output.

A

DTC C1428 is output.

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

    Stop Light Switch OFF Stuck Malfunction (C1426)
    DESCRIPTION The skid control ECU (brake actuator assembly) receives stop light switch signals and uses them to determine whether or not the brakes are applied. The skid control ECU (brake actuator ...

    Open or Short in Brake Pedal Load Sensing Switch (C1429)
    DESCRIPTION The brake pedal load sensing switch turns on when the brake pedal is depressed with a force exceeding a predetermined level. The skid control ECU uses this circuit to detect if the bra ...

    Other materials:

    Toyota CH-R Service Manual > Airbag System: Lost communication with Side Airbag Sensor RH (B1622/81,B1623/81,B1632/81,B1633/81,B1642/81,B1643/81,B166D/81,B166E/81)
    DESCRIPTION The side collision sensor RH circuit (bus 1) consists of the airbag sensor assembly, door side airbag sensor RH, No. 1 side airbag sensor RH and No. 2 side airbag sensor RH. The door side airbag sensor RH, No. 1 side airbag sensor RH and No. 2 side airbag sensor RH detect impacts ...

    Toyota CH-R Service Manual > Occupant Classification System: Front Occupant Classification Sensor LH Circuit Malfunction (B1780)
    DESCRIPTION The front occupant classification sensor LH circuit consists of the occupant detection ECU and front in weight detection sensor sub-assembly. DTC B1780 is stored when a malfunction is detected in the front in weight detection sensor sub-assembly circuit. DTC No. ...

    Toyota C-HR (AX20) 2023-2025 Owner's Manual

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2025 Copyright www.tochr.net
    0.0098