Toyota CH-R Service Manual: 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.

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CAUTION / NOTICE / HINT

NOTICE:

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

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  • 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.

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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.

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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

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