Tacoma

Toyota Tacoma 2015-2018 Brake Workshop Manual

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Last Modified: 11-13-2015 6.6 C Doc ID: RM000001EAA036X
Model Year Start: 2016 Model: Tacoma Prod Date Range: [08/2015 - ]
Title: BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM (for Hydraulic Brake Booster): C1257; Power
Supply Drive Circuit; 2016 MY Tacoma [08/2015 - ]
DTC C1257 Power Supply Drive Circuit
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
INSPECTION PROCEDURE
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
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.
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