RM38T0EC _54 Brake _112606 BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS _0608077 ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for HEV Model) C

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS ELECTRONICALLY CONTROLLED BRAKE SYSTEM(for HEV Model) C121F04 Electronic Brake Booster Control Module "A" System Internal Failure C14C9A3 Electronic Brake Booster Control Module "A" System Voltage High

DESCRIPTION

If there is a malfunction in the power source circuit, the electric brake booster (brake booster with master cylinder assembly) stores a DTC, and ABS, brake assist, regenerative braking, etc. operation is prohibited by fail-safe control.

When a malfunction in the auxiliary battery, charging circuit, etc. results in a voltage differential between the +BS terminal and the internal circuit terminal of the electric brake booster (brake booster with master cylinder assembly), this DTC is stored.

When the voltage between the +BS terminal and the internal circuit terminal of the electric brake booster (brake booster with master cylinder assembly) returns to normal, this DTC is cleared.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C121F04	Electronic Brake Booster Control Module "A" System Internal Failure	A voltage difference of 1.0 V or more is detected between the +BS terminal and the IGR terminal, and the voltage of the IGR terminal is 3.2 V or less.	· Wire harness or connector · Electric brake booster (brake booster with master cylinder assembly)	Comes on	Brake Booster	· SAE Code: C121F (Case 2 to 11) · Output ECU: Electric brake booster (brake booster with master cylinder assembly)
C14C9A3	Electronic Brake Booster Control Module "A" System Voltage High	The +BS terminal voltage is less than 27.5 V for 0.2 seconds or more.	· Wire harness or connector · Electric brake booster (brake booster with master cylinder assembly)	Comes on	Brake Booster	· SAE Code: C14CB · Output ECU: Electric brake booster (brake booster with master cylinder assembly)

CONFIRMATION DRIVING PATTERN

NOTICE:: When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.

HINT:: ·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Connect the GTS to the DLC3.

Turn the ignition switch to ON and turn the GTS on.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

Turn the ignition switch off.

Turn the ignition switch to ON (READY) and turn the GTS on.

Wait for 1 second or more. [*]

HINT:: [*]: Normal judgment procedure.; The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

Enter the following menus: Chassis / Brake Booster / Utility / All Readiness.

Check the DTC judgment result.

HINT:: ·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE, perform driving pattern again.

WIRING DIAGRAM

4.771,3.75 5.229,3.948 0.458,0.198 10 false A194 5.667,2.823 5.958,3.021 0.292,0.198 10 false 26 5.667,1.031 5.958,1.229 0.292,0.198 10 false 11 5.719,1.927 6.01,2.125 0.292,0.198 10 false 4 1.365,1.125 4.729,1.323 3.365,0.198 10 false from Auxiliary Battery 1.365,2.042 4.729,2.24 3.365,0.198 10 false from IGR NO. 1 Relay 3.729,1.323 7.094,1.521 3.365,0.198 10 false ABS MAIN 3.531,2.208 4.76,2.552 1.229,0.344 10 false ECU-IGR NO. 4 5.979,1.167 6.438,1.365 0.458,0.198 10 false +BS 5.979,2.052 6.438,2.25 0.458,0.198 10 false IGR 5.979,2.917 6.438,3.115 0.458,0.198 10 false GND 4.76,3.948 7.125,4.354 2.365,0.406 10 false Electric Brake Booster (Brake Booster with Master Cylinder Assembly)

CAUTION / NOTICE / HINT

NOTICE:: Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.CHECK HARNESS AND CONNECTOR (+BS TERMINAL)

1.5,0.417 1.917,0.667 0.417,0.25 1,2.75 0.792,1.969 true 0.25,0.167 0.563,0.365 0.313,0.198 10 false *a 1.552,0.438 2.01,0.635 0.458,0.198 10 false A194 0.906,2.781 1.365,2.979 0.458,0.198 10 false +BS

*a	Front view of wire harness connector (to Electric Brake Booster (Brake Booster with Master Cylinder Assembly))

Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:: The connector is securely connected.

Disconnect the A194 electric brake booster (brake booster with master cylinder assembly) connector.

Check both the connector case and the terminals for deformation and corrosion.

OK:: No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A194-11 (+BS) - Body ground	Always	11 to 14 V

Result:

Proceed to
OK
NG

2.CHECK HARNESS AND CONNECTOR (IGR TERMINAL)

REPAIR OR REPLACE HARNESS OR CONNECTOR