DTC C1365/54: Accumulator Pressure Sensor Malfunction: Procedure

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 And Brake Actuator Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A46 skid control ECU connector 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) - A24-45 (E)	Always	Below 1 Ω
   A46-8 (E) - Body ground	Always	10 kΩ or higher
   A46-9 (VCM) - A24-35 (VCM)	Always	Below 1 Ω
   A46-9 (VCM) - Body ground	Always	10 kΩ or higher
   A46-21 (PAC1) - A24-46 (PAC1)	Always	Below 1 Ω
   A46-21 (PAC1) - Body ground	Always	10 kΩ or higher
   A46-31 (PCK1) - A24-37 (PCK1)	Always	Below 1 Ω
   A46-31 (PCK1) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU connector and the brake actuator connector.
   Fig 2: Identifying Skid Control ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A46-9 (VCM) - Body ground	Ignition switch ON	4.75 to 5.25 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Skid Control ECU)

NG → See step   7 

OK: Go to next step 

1. Depress the brake pedal to operate the pump motor, and then check that the pump motor stops.
   Fig 3: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.
   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.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A46-21 (PAC1) - Body ground	Ignition switch ON	3 to 4.7 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Skid Control ECU)

NG → See step   8 

OK: Go to next step 

1. Turn the ignition switch off.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. 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
   Accumulator Sensor	Accumulator pressure sensor / Min.: 0.00 V, Max.: 5.00 V	Specified value: 2.6 to 3.8 V	When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator

5. Wait for 30 seconds without operating the brake pedal. Then check the accumulator pressure sensor output value's change is within the specified range.

   OK

   Accumulator pressure sensor output value's change is within 0.2 V.

NG → See step   8 

OK: Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs, refer to DTC CHECK / CLEAR .
3. Perform a road test.
4. Check if the same DTC is recorded, refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC (C1365/54) is not output	A
   DTC (C1365/54) is output	B

B → See step   7 

A → See step   6