Inspection Procedure

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION ).

CHECK STOP LIGHT SWITCH OPERATION
1. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.
OK: Stop light switch function is normal.

NG: Go to step 4

OK: Go to next step

INSPECT SKID CONTROL ECU (STP TERMINAL)

Disconnect the A24 skid control ECU connector.
Measure the voltage according to the value(s) in the table below.

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
A24-7 (STP) - Body ground	Stop light switch on (Brake pedal depressed)	8 to 14 V
A24-7 (STP) - Body ground	Stop light switch off (Brake pedal released)	Below 1.5 V

Fig 1: Identifying A24 Skid Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result

RESULT REFERENCE

Result	Proceed to
OK (When troubleshooting in accordance with the Diagnostic Trouble Code Chart)	A
OK (When troubleshooting in accordance with the Problem Symptoms Table)	B
NG	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

C: REPAIR OR REPLACE HARNESS OR CONNECTOR

A: Go to next step

RECONFIRM DTC

Clear the DTC (See DTC CHECK/CLEAR ).

Check if the same DTC is output (See DTC CHECK/CLEAR ).

HINT:

Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result

RESULT REFERENCE

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

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: REPLACE MASTER CYLINDER SOLENOID (See DISASSEMBLY )

INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE TERMINAL)

Disconnect the A30 stop light switch connector.
Measure the voltage according to the value(s) in the table below.

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
A30-2 - Body ground	Always	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying A30 Stop Light Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

INSPECT STOP LIGHT SWITCH ASSEMBLY

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

Standard Resistance

RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
A30-1 - A30-2	Switch pin free	Below 1 Ω
A30-1 - A30-2	Switch pin pushed in	10 kΩ or higher

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY (See REMOVAL )

Fig 3: Inspecting Stop Light Switch Assembly

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)

Disconnect the A24 skid control ECU connector.
Measure the resistance according to the value(s) in the table below.

Standard Resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
A24-45 (STP2) - A30-1	Always	Below 1 Ω

HINT:

When troubleshooting in accordance with the Diagnostic Trouble Code Chart, check DTCs before replacing the master cylinder solenoid (See DTC CHECK/CLEAR ).
When troubleshooting in accordance with the Problem Symptoms Table, be sure to follow the table before replacing the master cylinder solenoid (See PROBLEM SYMPTOMS TABLE ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Identifying A24 Skid Control ECU And A30 Stop Light Switch Connector

OK: REPLACE MASTER CYLINDER SOLENOID (See DISASSEMBLY )