Toyota Tacoma (2015-2018) Service Manual: Motor Circuit Malfunction (C1428)

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Motor Circuit Malfunction (C1428)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1428	Motor Circuit Malfunction	With the motor relay and motor fail-safe relay OFF, open or short in motor circuit continues for 2 seconds or more.	Brake actuator assembly (Motor circuit)

WIRING DIAGRAM

Refer to DTCs C142B, C146C and C146D (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page PROCEDURE ).

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

(a) Turn the ignition switch off.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
S1-1 (GND2) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly])

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

Motor Power Supply Voltage Circuit (C142B-C146D)

DESCRIPTION The motor relay and motor fail-safe relay are built into the brake actuator assembly. During ABS, TRAC, VSC, or brake assist operation, the skid control ECU (brake actuator assembly) t ...

Steering Angle Sensor Power Source Voltage Malfunction (C1432)

DESCRIPTION The skid control ECU (brake actuator assembly) outputs this DTC when it receives a sensor power source malfunction signal from the steering angle sensor. DTC No. ...

Other materials:

Transmission Fluid Temperature Sensor "B" Circuit Short to Battery or Open (P274015)
DESCRIPTION The No. 2 ATF temperature sensor is installed in the transmission valve body assembly. If the ECM detects an abnormally high ATF temperature near this sensor, it illuminates the warning indicator. HINT: The temperature of ATF easily rises when towing, climbing hills, in traffic, ...

Repair
REPAIR PROCEDURE 1. STEERING OFF CENTER REPAIR PROCEDURE (a) Check if the steering wheel is off center. (1) Apply masking tape to the top center of the steering wheel and upper steering column cover. Text in Illustration *1 Steering Wheel ...

Terminals Of Ecu
TERMINALS OF ECU 1. RADIO AND DISPLAY RECEIVER ASSEMBLY Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition R30-1 (FR+) - R30-7 (GND1) LA-R - W-B Sound signal (Front Ri ...