Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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).

(c) Depress the brake pedal more than 20 times.

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

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

OK:

Hydraulic brake booster pump operates.

NG

REPLACE MASTER CYLINDER SOLENOID

OK

2.

RECONFIRM DTC

(a) Turn the ignition switch to OFF.

(b) Reconnect the actuator connector (S1).

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

(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

A

REPLACE MASTER CYLINDER SOLENOID

B

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 ...

Transfer L4 Position Switch Circuit (C1268)
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 ...

Other materials:

Replacement
REPLACEMENT PROCEDURE 1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM (a) Start the engine. (b) Operate the cooler compressor under the conditions shown below: Item Condition Engine Speed Idling Operating Time 3 minu ...

ECM Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area ECM Communication Stop Mode Either condition is met: Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the ...

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE FRONT OIL PUMP BODY O-RING (a) Remove the front oil pump body O-ring from the oil pump assembly. 2. SECURE OIL PUMP ASSEMBLY (a) Place the oil pump assembly on the torque converter assembly. ...

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