Toyota Tacoma (2015-2018) Service Manual: Power Supply Drive Circuit (C1257)

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Power Supply Drive Circuit (C1257)

DESCRIPTION

The motor relay (semiconductor relay) is built into the hydraulic brake booster and drives the pump motor based on a signal from the skid control ECU (master cylinder solenoid).

DTC No.	DTC Detecting Condition	Trouble Areas
C1257	Open in pump motor input circuit	Hydraulic brake booster pump motor circuit

PROCEDURE

1.	CHECK HYDRAULIC BRAKE BOOSTER PUMP MOTOR OPERATION

(a) Turn the ignition switch to OFF.

(b) Disconnect the actuator connector (S1).

(d) Turn the ignition switch to the ON position.

(e) Check the hydraulic brake booster pump motor operation.

OK:

Hydraulic brake booster pump operates.

REPLACE MASTER CYLINDER SOLENOID

2.	RECONFIRM DTC

(a) Turn the ignition switch to OFF.

(b) Reconnect the actuator connector (S1).

(d) Clear the DTCs (See page (e) Check if the same DTCs are recorded. ).

(e) Check if the same DTCs are recorded.

Result	Proceed to
DTC output	A
DTC not output	B

REPLACE MASTER CYLINDER SOLENOID

END

Accumulator Low Pressure (C1256)

DESCRIPTION The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid. DTC No. DTC Detecting Condition Trouble Areas ...

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DESCRIPTION A-TRAC is activated if wheel skid is detected while the transfer is in the L4 position. DTC Code DTC Detecting Condition Trouble Areas ...

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