DTC C1341/62: Front Hydraulic System RH Malfunction; DTC C1342/63: Front Hydraulic System LH Malfunction; DTC C1343/64: Rear Hydraulic System RH Malfunction; DTC C1344/65: Rear Hydraulic System LH Malfunction: Procedure

1. Check that there is no fluid leakage in the brake line between the brake actuator and the wheel cylinder which is indicated by 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 

1. Bleed the air from the front and rear brake systems, refer to BLEEDING .

NEXT: Go to next step 

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
   Fig 1: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A45 and A46 skid control ECU connectors and the brake actuator connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester connection	Condition	Specified condition
   A46-8 (E) - Body ground	Always	10 kΩ or higher
   A46-9 (VCM) - Body ground	Always	10 kΩ or higher
   A46-10 (SG1) - Body ground	Always	10 kΩ or higher
   A46-12 (SG3) - Body ground	Always	10 kΩ or higher
   A46-18 (PRL) - Body ground	Always	10 kΩ or higher
   A46-21 (PAC1) - Body ground	Always	10 kΩ or higher
   A46-30 (PMC1) - Body ground	Always	10 kΩ or higher
   A46-31 (PCK1) - Body ground	Always	10 kΩ or higher
   A46-32 (PFR) - Body ground	Always	10 kΩ or higher
   A45-10 (SG2) - Body ground	Always	10 kΩ or higher
   A45-15 (E2) - Body ground	Always	10 kΩ or higher
   A45-16 (VCM2) - Body ground	Always	10 kΩ or higher
   A45-23 (PFL) - Body ground	Always	10 kΩ or higher
   A45-24 (PRR) - Body ground	Always	10 kΩ or higher
   A45-28 (PMC2) - Body ground	Always	10 kΩ or higher
   A45-29 (PCK2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Skid Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU connectors and the brake actuator connector.
2. Connect a pedal effort gauge, refer to ON-VEHICLE INSPECTION .
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Select the Data List on the Techstream, refer to DATA LIST / ACTIVE TEST .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   FR W/C Sensor	FR wheel cylinder pressure sensor / Min.: 0.00 V, Max.: 5.00 V	When brake pedal is released: 0.3 to 0.7 V	Reading increases when brake pedal is depressed
   FL W/C Sensor	FL wheel cylinder pressure sensor / Min.: 0.00 V, Max.: 5.00 V	When brake pedal is released: 0.3 to 0.7 V	Reading increases when brake pedal is depressed
   RR W/C Sensor	RR wheel cylinder pressure sensor / Min.: 0.00 V, Max.: 5.00 V	When brake pedal is released: 0.3 to 0.7 V	Reading increases when brake pedal is depressed
   RL W/C Sensor	RL wheel cylinder pressure sensor / Min.: 0.00 V, Max.: 5.00 V	When brake pedal is released: 0.3 to 0.7 V	Reading increases when brake pedal is depressed

6. Check the output value of the wheel cylinder pressure sensor at each hydraulic pressure level during electronically controlled brake system control.

   Standard Voltage

   for Front Wheel Cylinder Pressure Sensor 

   for Rear Wheel Cylinder Pressure Sensor 

   Hydraulic Pressure MPa (kgf/cm2 , psi)	FR W/C Sensor (Data List Display)	FL W/C Sensor (Data List Display)
   2.4 (24.5, 348)	0.80 to 1.20 V	0.80 to 1.20 V
   5.4 (54.1, 783)	1.40 to 1.80 V	1.40 to 1.80 V
   6.5 (66.3, 943)	1.60 to 2.00 V	1.60 to 2.00 V
   7.1 (72.4, 1030)	1.75 to 2.15 V	1.75 to 2.15 V

   Hydraulic Pressure MPa (kgf/cm2 , psi)	RR W/C Sensor (Data List Display)	RL W/C Sensor (Data List Display)
   2.4 (24.5, 348)	0.80 to 1.20 V	0.80 to 1.20 V
   5.0 (51.0, 725)	1.30 to 1.70 V	1.30 to 1.70 V

NG → See step   8 

OK: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the brake pedal stroke sensor connector.
3. Perform a road test according to the Freeze Frame Data or customer problem analysis. Check for brake pedal vibration in order to confirm if there is brake line pressure fluctuation due to uneven wear of the disc.

   OK

   The 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 system control.
   • If the brake pedal stroke sensor connector is disconnected, the fail-safe function will prohibit electronically controlled brake system control.
   • The Active Test does not prohibit electronically controlled brake system control when the vehicle is driving, so disconnect the stroke sensor connector before continuing with the inspection.
   • Disc wear can be checked by measuring the disc thickness, refer to INSPECTION for front, or, refer to INSPECTION for rear).

NG → REPLACE BRAKE DISC 

OK: Go to next step 

1. Reconnect the brake pedal stroke sensor connector.
2. Clear the DTCs, refer to DTC CHECK / CLEAR .
3. Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
4. Check if the same DTC is recorded, refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTCs (C1341/62, C1342/63, C1343/64 and C1344/65) are not output	A
   DTCs (C1341/62, C1342/63, C1343/64 and/or C1344/65) are output	B

B → See step   8 

A → See step   7