DTC C1365: Accumulator Pressure Sensor [09/2018 - ]: Procedure

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
2. Disconnect the A8 skid control ECU assembly connector.
3. Disconnect the A7 brake actuator assembly connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A8-8 (E) - A7-14 (E)	Always	Below 1 Ω
   A8-8 (E) or A7-14 (E) - Body ground	Always	10 kΩ or higher
   A8-9 (VCM) - A7-10 (VCM)	Always	Below 1 Ω
   A8-9 (VCM) or A7-10 (VCM) - Body ground	Always	10 kΩ or higher
   A8-21 (PAC1) - A7-15 (PAC1)	Always	Below 1 Ω
   A8-21 (PAC1) or A7-15 (PAC1) - Body ground	Always	10 kΩ or higher
   A8-31 (PCK1) - A7-12 (PCK1)	Always	Below 1 Ω
   A8-31 (PCK1) or A7-12 (PCK1) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Reconnect the A8 skid control ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Skid Control ECU Assembly)

2. Reconnect the A7 brake actuator assembly connector.
3. Turn the engine switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A8-9 (VCM) - Body ground	Engine switch on (IG)	4.75 to 5.25 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

OK 

See step  3

1. Depress the brake pedal to operate the pump motor, and then check that the pump motor stops.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Skid Control ECU Assembly)

   NOTE:

   Do not depress the brake pedal until the pump motor stops and the voltage check is finished in order to maintain the accumulator pressure.

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A8-21 (PAC1) - Body ground	Engine switch on (IG), after pump motor operates and stops by pedal operation	3 to 4.7 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

OK 

See step  4

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Select the Data List on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [03/2017 - 05/2023] , or refer to DATA LIST / ACTIVE TEST [05/2023 - ]

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Accumulator Sensor	Accumulator pressure sensor	Min.: 0.00 V, Max.: 5.00 V	Specified value: 2.60 to 3.80 V	When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display
   Accumulator Sensor

5. Depress the brake pedal 4 or 5 times and operate the pump motor.
6. Wait for 30 seconds without depressing the brake pedal.
7. Check that the accumulator pressure sensor output value change is within the specified range.

   OK

   Accumulator pressure sensor output value change is less than 0.20 V.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

OK 

See step  5

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2018 - ]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

2. Turn the engine switch off.
3. Start the engine.
4. Perform a road test.
5. Check if the same DTC is output.

   Refer to DTC CHECK / CLEAR [09/2018 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1365 is output.	A
   DTC C1365 is not output.	B

Result: 

A 

REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

B 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2020 - 05/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2023 - ]