Toyota Tundra 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

Any of the following is detected:

  • When the pump motor is not operating and the pump motor voltage is continuously 0.93 V or higher for 10 seconds.
  • When a malfunction occurs in the pump motor circuit.
  • When the switching voltage of the pump motor decreases while the pump motor is operating.
  • When a malfunction occurs in the input voltage of the pump motor after the pump motor is operated.

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 and acceleration sensor zero point calibration.

    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.

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A57 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A57-1 (+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

A57-13 (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 A57 skid control ECU (brake actuator assembly) connector.

(b) Clear the DTCs.

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(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

Result

Proceed to

C1428 is not output

A

C1428 is output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

    Stop Light Switch OFF Stuck Malfunction (C1426)

    Open or Short in Brake Pedal Load Sensing Switch (C1429)

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