- Stop light switch
- Brake pedal load sensing switch
- Master cylinder pressure sensor
DESCRIPTIONDTC C1281 will be cleared when the master cylinder pressure sensor sends a master cylinder pressure signal or when Test Mode ends. DTC C1281 is output only in Test Mode.
WIRING DIAGRAMRefer to DTCs C1425 and C1429 (See page , or ). CAUTION / NOTICE / HINTNOTICE: When replacing the brake actuator assembly, perform zero point calibration and store system information (See page ). PROCEDURE
(a) Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released. OK
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Chassis / ABS/VSC/ TRAC / Data List. (e) Select the Data List on the Techstream (See page ). ABS/VSC/TRAC
(f) Check that the stop light switch display and brake pedal load sensing switch display observed on the Techstream change according to brake pedal operation. OK: The Techstream displays ON or OFF according to brake pedal operation. (g) Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn ON. OK: First the stop light switch should turn ON, and then the brake pedal load sensing switch should turn ON. Result
(a) Enter the following menus: Chassis / ABS/VSC/ TRAC / Data List. (b) Select the Data List on the Techstream (See page ). ABS/VSC/TRAC
(c) Check that the brake fluid pressure value of the master cylinder pressure sensor observed on the Techstream changes when the brake pedal is depressed. OK: When the pedal is depressed, voltage displayed on the Techstream increases.
(a) Turn the ignition switch off. (b) Perform the sensor check in the Test Mode procedure (See page ). OK: All Test Mode DTCs are cleared.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector. (c) Disconnect the skid control ECU connector. (d) Measure the voltage according to the value(s) in the table below. Standard Voltage:
Text in Illustration
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector. (c) Disconnect the skid control ECU connector. (d) Measure the resistance according to the value(s) in the table below. Standard Resistance:
Text in Illustration
(a) Turn the ignition switch off. (b) Check the brake pedal height and stop light switch installation (See page ). OK: The brake pedal height and stop light switch installation are normal.
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