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.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-1 (+BM) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)

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))

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

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

(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

USE SIMULATION METHOD TO CHECK

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 Owners Manual > If you have a flat tire: Installing the spare tire
1. Remove any dirt or foreign matter from the wheel contact surface. If foreign matter is on the wheel contact surface, the wheel nuts may loosen while the vehicle is in motion, causing the tire to come off. 2. Install the tire and loosely tighten each wheel nut by hand by approximately th ...

Toyota CH-R Service Manual > Lin Communication System: Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may ...