DESCRIPTION The master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly. 
WIRING DIAGRAM Refer to DTC C1249. 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
PROCEDURE
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List. ABS/VSC/TRAC
(d) Check that the stop light switch assembly display observed on the Techstream changes according to brake pedal operation. OK: The Techstream displays on or off according to brake pedal operation.
(a) Start the engine. (b) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List. ABS/VSC/TRAC
(c) Check that the value of the master cylinder pressure sensor observed on the Techstream changes when the brake pedal is depressed. OK: When the brake pedal is depressed, the voltage displayed on the Techstream increases.
(a) Clear the DTCs. Click here (b) Turn the ignition switch off. (c) Start the engine. (d) Drive the vehicle at a speed 6 km/h (3.7 mph) or more and depress the brake pedal several times to test the stop light circuit. (e) Check if the same DTC is output. Click here
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected. (c) Disconnect the A57 skid control ECU (brake actuator assembly) connector. (d) Check both the connector case and the terminals for deformation and corrosion. OK: No deformation or corrosion. (e) Measure the voltage according to the value(s) in the table below. Standard Voltage:
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Toyota Tundra Service Manual > Brake Booster: Removal
REMOVAL CAUTION / NOTICE / HINT NOTICE: Make sure to release the vacuum from the brake booster before removing the master cylinder from the brake booster. PROCEDURE 1. PRECAUTION NOTICE: After turning the ignition switch off, waiting time may be required before disconnecting the cable from the batte ...
