Inspection Procedure

HINT:

When C1364/61 is output together with C1341/62, C1342/63, C1343/64 and C1344/65, inspect and repair the trouble areas indicated by C1364/61 first.

1. CHECK BRAKE FLUID LEAKAGE 
   1. Check that there is no fluid leakage in the brake line between the brake actuator and the wheel cylinder which is the cause of DTCs.
   2. Check that the brake is not dragging.

      OK: 

      There is no fluid leakage or dragging. 

   NG: REPAIR OR REPLACE APPLICABLE PART 

   OK: Go to next step 

2. PERFORM AIR BLEED 
   1. Bleed the air out of the front and rear systems (See BLEEDING ) .
3. RECONFIRM DTC 
   1. Clear the DTCs (see DTC CHECK / CLEAR  ).
   2. Turn the power switch ON (READY).
   3. Check the same DTCs are recorded (see DTC CHECK / CLEAR  ).

      Result 

      DTC RESULT REFERENCE
      
      

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

      HINT:

      DTC may be stored if foreign matter or air enters the solenoid valve.

   B: END 

   A: Go to next step 

4. CHECK WIRE HARNESS (SKID CONTROL ECU - BRAKE ACTUATOR) 
   1. Disconnect the S7 and S10 connectors.
   2. Disconnect the A2 actuator connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      STANDARD RESISTANCE REFERENCE CHART
      
      

      Tester Connection	Specified Condition
      S7-6 (SLAFR-) - A2-5 (FR-)	Below 1 Ω
      S7-7 (SLAFR+) - A2-8 (FR+)	Below 1 Ω
      S7-15 (SLARL+) - A2-10 (RL+)	Below 1 Ω
      S7-16 (SLRRL+) - A2-24 (RL+)	Below 1 Ω
      S7-17 (SLRFR+) - A2-22 (FR+)	Below 1 Ω
      S7-26 (SLRRL-) - A2-23 (RL-)	Below 1 Ω.
      S7-27 (SLARL-) - A2-9 (RL-)	Below 1 Ω
      S7-34 (SLRFR-) - A2-21 (FR-)	Below 1 Ω
      S10-1 (SLAFL+) - A2-13 (FL+)	Below 1 Ω
      S10-2 (SLAFL-) - A2-14 (FL-)	Below 1 Ω
      S10-8 (SLRFL+) - A2-27 (FL+)	Below 1 Ω
      S10-9 (SLARR-) - A2-11 (RR-)	Below 1 Ω
      S10-18 (SLRRR-) - A2-25 (RR-)	Below 1 Ω
      S10-19 (SLARR+) - A2-12 (RR+)	Below 1 Ω
      S10-20 (SLRRR+) - A2-26 (RR+)	Below 1 Ω
      S10-26 (SLRFL-) - A2-28 (FL-)	Below 1 Ω
      S7-6 (SLAFR-) - Body ground	10 kΩ or higher
      S7-7 (SLAFR+) - Body ground	10 kΩ or higher
      S7-15 (SLARL+) - Body ground	10 kΩ or higher
      S7-16 (SLRRL+) - Body ground	10 kΩ or higher
      S7-17 (SLRFR+) - Body ground	10 kΩ or higher
      S7-26 (SLRRL-) - Body ground	10 kΩ or higher
      S7-27 (SLARL-) - Body ground	10 kΩ or higher
      S7-34 (SLRFR-) - Body ground	10 kΩ or higher
      S10-1 (SLAFL+) - Body ground	10 kΩ or higher
      S10-2 (SLAFL-) - Body ground	10 kΩ or higher
      S10-8 (SLRFL+) - Body ground	10 kΩ or higher
      S10-9 (SLARR-) - Body ground	10 kΩ or higher
      S10-18 (SLRRR-) - Body ground	10 kΩ or higher
      S10-19 (SLARR+) - Body ground	10 kΩ or higher
      S10-20 (SLRRR+) - Body ground	10 kΩ or higher
      S10-26 (SLRFL-) - Body ground	10 kΩ or higher

      Fig 1: Identifying Skid Control ECU And Brake Actuator Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: Go to next step 

5. READ VALUE OF TECHSTREAM (WHEEL CYLINDER PRESSURE SENSOR) 
   1. Connect the pedal effort gauge.
   2. Install the LSPV gauge (SST) and bleed air (see ON-VEHICLE INSPECTION  ).

      SST 09709-29018 

   3. Select the DATA LIST mode on the Techstream.

      ABS / VSC / TRAC: 

      SKID CONTROL ECU DIAGNOSTIC CHART
      
      

      Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Note
      FR W/CYLINDER	Front right pressure sensor/ Min.: 0 V, Max.: 5 V	When brake pedal is released: 0.3 to 0.9 V	-
      FL W/CYLINDER	Front left pressure sensor / Min.: 0 V, Max.: 5 V	When brake pedal is released: 0.3 to 0.9 V	-
      RR W/CYLINDER	Rear right pressure sensor / Min.: 0 V, Max.: 5 V	When brake pedal is released: 0.3 to 0.9 V	-
      RL W/CYLINDER	Rear left pressure sensor/ Min.: 0 V, Max.: 5 V	When brake pedal is released: 0.3 to 0.9 V	-

   4. Check the output value of the wheel cylinder pressure at each fluid pressure during the Electronically Controlled Brake control.

      Standard voltage 

      STANDARD VOLTAGE CHART
      
      

      Fluid Pressure	FR (DATA-LIST)	FL W/CYLINDER (DATA-LIST)	RR W/CYLINDER (DATA-LIST)	RL W/CYLINDER (DATA-LIST)
      1 MPa(10.2kgf/cm, 145.0 psi)	0.65 to 0.75 V	0.65 to 0.75 V	0.65 to 0.75 V	0.65 to 0.75 V
      3 MPa (30.6 kgf/cm, 435.2 psi)	1.05 to 1.2 V	1.05 to 1.2 V	1.05 to 1.2 V	1.05 to 1.2 V
      7 MPa (71.4 kgf/cm, 1015.5 psi)	1.8 to 2.05 V	1.8 to 2.05 W	-	-
      10 MPa (102.0 kgf/cm, 1450.7 psi)	2.4 to 2.7 V	2.4 to 2.7	-	-

   NG: REPLACE BRAKE ACTUATOR ASSEMBLY 

   OK: Go to next step 

6. CHECK BRAKE DISC 
   1. Disconnect the brake pedal stroke sensor connector.
   2. Perform the running and braking test according to freeze frame data or customer problem analysis. Check if the brake line pressure vibration is due to uneven wear of the disc according to brake pedal vibration.

      OK: 

      Brake pedal does not vibrate during braking. 

      HINT:

      • The brake pedal does not kick back due to wheel cylinder piston vibration during Electronically Controlled Brake control.
      • If the brake pedal stroke sensor connector is disconnected, the fail-safe function prohibits Electronically Controlled Brake control.
      • The ACTIVE TEST does not prohibit Electronically Controlled Brake control when the vehicle is running, so disconnect the stroke sensor connector and perform the inspection.
      • Disc wear can be checked by measuring the disc thickness.

   NG: REPLACE BRAKE DISC 

   OK: REPLACE BRAKE ACTUATOR ASSEMBLY