Toyota Tacoma 2015-2018 Service Manual: Open in Pump Motor Circuit (C1251)

DESCRIPTION

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Remove the hydraulic brake booster before the inspection (See page ).

PROCEDURE

(a) Using a screwdriver, remove the 2 plugs from the hydraulic brake booster (See page ).

(b) Check the tightening torque of 2 screws which fasten the wire harness connecting hydraulic brake booster and brake booster pump (See page ).

Torque:

2.9 N·m {30 kgf·cm, 26 in·lbf}

NG

RETIGHTEN SCREWS

OK

(a) Using a screwdriver, remove the 2 screws and pull the wire harness from the hydraulic brake booster.

(b) Measure the resistance between the red wire (MT+) and black wire (MT-).

Resistance:

2 Ω

NG

REPLACE HYDRAULIC BRAKE BOOSTER

OK

(a) Reassemble the hydraulic brake booster, then reinstall the hydraulic brake booster.

(b) Clear the DTCs (See page ).

(c) Check if the same DTCs are detected.

A

REPLACE MASTER CYLINDER SOLENOID

B

END