BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C139100; Abnormal Leak in Accumulator; 2022 - 2024 MY RAV4 RAV4 HV [12/2021

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM10000000214QL
Model Year Start: 2022	Model: RAV4	Prod Date Range: [12/2021 - ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C139100; Abnormal Leak in Accumulator; 2022 - 2024 MY RAV4 RAV4 HV [12/2021 - ]

DTC

C139100

Abnormal Leak in Accumulator

DESCRIPTION

This DTC is stored if internal or external brake fluid leaks are detected due to improper sealing in the brake booster with master cylinder assembly or brake booster with accumulator pump assembly. Internal leaks are suspected if the pump motor operates frequently without braking.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Note
C139100	Abnormal Leak in Accumulator	Either of the following is detected: When the brake pedal is not depressed and the pump motor is operating, the accumulator pressure sensor value does not increase a certain number of times. When the brake pedal is not depressed and the pump motor is not operating, the accumulator pressure sensor decrease rate exceeds a certain threshold a certain number of times.	Brake fluid leaks Brake booster with master cylinder assembly (Malfunctioning internal seal etc.) Brake booster with accumulator pump assembly (Accumulator internal gas pressure decrease, etc.)	Does not come on	Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly)

C139100 DTC Detection Conditions

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	When the brake pedal is not depressed and the pump motor is operating	○	-
Diagnosis Condition	When the brake pedal is not depressed and the pump motor is not operating	-	○
Malfunction Status	The accumulator pressure sensor value does not increase a certain number of times	○	-
Malfunction Status	The accumulator pressure sensor decrease rate exceeds a certain threshold a certain number of times.	-	○
Detection Time		-	-
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

After replacing the No. 1 skid control ECU (brake booster with master cylinder assembly), perform "Calibration" after performing "Reset Memory".

Click here

PROCEDURE

1.	READ VALUE USING GTS (SERVO PRESSURE)

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

(b) 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

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

2.	CHECK OPERATING TIME OF PUMP MOTOR

(a) With the ignition switch is turned to ON (READY), check the operation 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

Chassis > Brake Booster > Data List

Tester Display
ECB Motor Relay

Result	Proceed to
The pump motor operates once or more within 20 seconds or operates for 10 seconds or more each time.	A
Other than above.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

3.	CHECK FOR FLUID LEAK

(a) Check for brake fluid leaks in the line from the brake booster with accumulator pump assembly to the brake booster with master cylinder assembly.

Click here

OK:

There are no brake fluid leaks.

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

for Brake Booster with Master Cylinder Assembly: Click here

for Brake Booster with Accumulator Pump Assembly: Click here

REPAIR MALFUNCTIONING PART