Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM10000000214Q5
Model Year Start: 2022 Model: RAV4 Prod Date Range: [12/2021 - 10/2023]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C125600; Accumulator Low Pressure Abnormality; 2022 - 2023 MY RAV4 RAV4 HV [12/2021 - 10/2023]

DTC

C125600

Accumulator Low Pressure Abnormality

DESCRIPTION

The accumulator pressure sensor is built into the brake booster with master cylinder assembly and detects the accumulator pressure.

The No. 1 skid control ECU (brake booster with master cylinder assembly) turns on the brake system warning light (red indicator) and brake system warning light (yellow indicator), and sounds the meter buzzer if it senses a decrease in the accumulator pressure.

DTC C125600 may be stored if the accumulator pressure drops due to frequent braking (this is not a malfunction).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

C125600

Accumulator Low Pressure Abnormality

Significant drop in accumulator pressure continues.

(DTCs will be stored and the buzzer will sound when the above condition is met.)
  • Accumulator pressure dropped due to frequent brake pedal operation (not a malfunction)
  • Pump motor malfunction
  • Accumulator deterioration
  • Accumulator pressure sensor (brake booster with master cylinder assembly)
  • Supply voltage reduced

Does not come on

Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly)

WIRING DIAGRAM

Refer to DTC C059400.

Click here 2022 - 2023 MY RAV4 RAV4 HV [12/2021 - 10/2023]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C059400; Brake Booster Motor "A" Performance

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After replacing the No. 1 skid control ECU (brake booster with master cylinder assembly), perform "Calibration" after performing "Reset Memory".

    Click here 2022 - 2024 MY RAV4 RAV4 HV [12/2021 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): UTILITY

PROCEDURE

1.

CHECK DTC

(a) Check the DTCs that are output.

Chassis > Brake Booster > Trouble Codes

Chassis > Brake/EPB > Trouble Codes

Result

Proceed to

Only DTC C125600 is output.

A

DTCs other than C125600 are output.

B
B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A

2.

INSPECT BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY

(a) Turn the ignition switch off.

*a

Component without harness connected

(Brake Booster with Accumulator Pump Assembly)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

(c) Disconnect the A106 brake booster with accumulator pump assembly connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (BM1) - 2 (GND1)

Always

10 Ω or less
NG

REPLACE BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER PUMP (w/o Vacuum Brake Booster): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER PUMP (w/o Vacuum Brake Booster): REMOVAL

OK

3.

READ VALUE USING GTS (ACCUMULATOR PRESSURE)

(a) Reconnect the A106 brake booster with accumulator pump assembly connector.

(b) Disconnect the A103 brake pedal stroke sensor assembly connector.

(c) Depress the brake pedal several times to operate the pump motor, then wait until it stops.

(d) After the pump motor stops, wait for 30 seconds, then check the drop in the accumulator pressure sensor output value and the state of the pump motor.

Chassis > Brake Booster > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

ECB Motor Relay

Motor relay operation request

OFF / ON

OFF: Relay off

ON: Relay on

ECB: Electronically Controlled Brake System

Accumulator Pressure

Accumulator pressure output value

Min.: 0.00 MPa

Max.: 24.48 MPa

15.00 to 21.00 MPa (Pressure stable and pump motor stopped)

When brake fluid is stored in the accumulator: Accumulator pressure changes in accordance with volume of fluid stored in the accumulator

Chassis > Brake Booster > Data List

Tester Display

ECB Motor Relay

Accumulator Pressure

Result

Proceed to

The drop in the accumulator pressure sensor output value is less than 2.50 MPa 30 seconds after the pump motor stops, and the pump motor does not operate within 30 seconds after the pump motor stops.

A

The drop in the accumulator pressure sensor output value is 2.50 MPa or more 30 seconds after the pump motor stops, or the pump motor operates within 30 seconds after the pump motor stops.

B
A

USE SIMULATION METHOD TO CHECK

B

4.

READ VALUE USING GTS (SERVO PRESSURE)

(a) Turn the ignition switch off.

(b) Reconnect the A103 brake pedal stroke sensor assembly connector.

(c) Perform the Active Test and operate the linear solenoid (SLR) in the brake booster with master cylinder assembly.

(d) Check that the servo pressure output value does not increase when performing the Active Test.

Chassis > Brake Booster > Active Test

Tester Display

Measurement Item

Control Range

Restrict Condition

Diagnostic Note

ECB Solenoid (SLR)

Linear solenoid reduction valve (SLR)

Solenoid Start (Activate)

Solenoid SLR

(It is possible to set the current)

Vehicle condition:

  • Vehicle stopped
  • Shift lever is in P
  • Apply the parking brake

ECB: Electronically Controlled Brake System

Chassis > Brake Booster > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Servo Pressure

Pressure value of servo

Min.: 0.00 MPa

Max.: 24.48 MPa

Brake pedal released: 0.00 to 1.53 MPa

Brake pedal is being depressed: Changes in proportion to the depression force of the brake pedal

Chassis > Brake Booster > Active Test

Active Test Display

ECB Solenoid (SLR)

Data List Display

Servo Pressure

OK:

The servo pressure output value does not increase when performing the Active Test.

HINT:

  • If the servo pressure output value increases, an internal brake fluid leak in the brake booster with master cylinder assembly is suspected.
  • Perform the Active Test with the current set to maximum.

Result

Proceed to

The servo pressure output value increases.

A

The servo pressure output value does not increase.

B
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (w/o Vacuum Brake Booster): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (w/o Vacuum Brake Booster): REMOVAL

B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY AND BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY

for Brake Booster with Master Cylinder Assembly: Click here 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (w/o Vacuum Brake Booster): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (w/o Vacuum Brake Booster): REMOVAL

for Brake Booster with Accumulator Pump Assembly: Click here 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER PUMP (w/o Vacuum Brake Booster): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER PUMP (w/o Vacuum Brake Booster): REMOVAL