Inspection Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch to the ON position and push Techstream main switch ON.
3. Select "Data List" mode on Techstream.

   ABS/VSC/TRAC 

   DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Master Cylinder Sensor 1	Master cylinder pressure sensor 1 reading/min 0 V, max 5 V	When brake pedal is released 0.3 to 0 9 V	Reading increases when brake pedal is depressed

4. Check that the master cylinder pressure value of the master cylinder pressure sensor displayed on Techstream changes when depressing the brake pedal.

   Result 

   RESULT CHART
   
   

   Condition	Proceed to
   Master cylinder pressure sensor value does not change	A
   Master cylinder pressure sensor value changes but it is not normal	B
   Master cylinder pressure sensor value becomes normal	C

A: REPLACE MASTER CYLINDER SOLENOID 

C: Go to step  4

B: Go to next step 

1. Check the brake pedal height.
2. Check the stop light switch installation.

   OK: The brake pedal and stop light switch are normal. 

NG: ADJUST BRAKE PEDAL AND/OR STOP LIGHT SWITCH 

OK: Go to next step 

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

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S37-7 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
   S37-7 (STP) - Body ground	Stop light switch OFF (Brake pedal released	Below 1.5 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

Fig 1: Identifying S37 Skid Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Clear the DTC (See DTC CHECK/CLEAR  ).
2. Check if the same DTC is detected (See DTC CHECK/CLEAR  ).

   HINT:

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

   Result 

   RESULT CHART
   
   

   Condition	Proceed to
   DTC is output	A
   DTC is not output	B

B: END 

A: REPLACE MASTER CYLINDER SOLENOID