DTC C1422: Master Cylinder Pressure Sensor Zero Point High Malfunction [08/2015 - 08/2019]: Procedure

See step  2

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Turn the ignition switch off.
2. Check the brake pedal height and stop light switch assembly installation (Refer to ADJUSTMENT [08/2015 - ] ).

   OK

   The brake pedal height and stop light switch assembly installation are normal.

Result: 

NG 

ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY 

(Refer to ADJUSTMENT [08/2015 - ] )

Result: 

OK 

See step  3

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
2. Start the engine.
3. Drive the vehicle at a speed of 40 km/h (25 mph) or more and perform a braking test (decelerate the vehicle by depressing the brake pedal).
4. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
   RESULT
   
   

   Result	Proceed to
   DTC C1422 is not output	A
   DTC C1422 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

1. Make sure that there is no looseness in the locking part and connecting part of the connectors.
2. Disconnect the A47 stop light switch assembly connector.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A47-7 (B) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Stop Light Switch Assembly)

4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A85-3 (GND) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

See step  5

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

See step  6

1. Disconnect the A47 stop light switch assembly connector.
2. Disconnect the A53 skid control ECU (brake actuator assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A47-1 (OUT) - A53-2 (STP)	Always	Below 1 Ω
   A47-1 (OUT) or A53-2 (STP) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE STOP LIGHT SWITCH ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR