Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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 ).

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.

(c) Disconnect the S1 skid control ECU (brake actuator assembly) connector.

(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])

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)

Motor Power Supply Voltage Circuit (C142B-C146D)
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Steering Angle Sensor Power Source Voltage Malfunction (C1432)
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Other materials:

Inspection
INSPECTION PROCEDURE 1. INSPECT OIL CLEARANCE (a) Using a micrometer and caliper gauge, measure the oil seal clearance. Standard clearance: 0.021 to 0.043 mm (0.0008 to 0.0017 in.) Maximum clearance: 0.07 mm (0.0028 in.) If it is greater than the maximum, replace the vane pump assembly. ...

System Description
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Precaution
PRECAUTION 1. PRECAUTION (a) Before starting work on the fuel system, including inspections and repairs, disconnect the cable from the negative (-) battery terminal. (b) Do not smoke or work near fire when performing work on the fuel system. (c) Keep gasoline away from rubber or leather parts. ...

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