Toyota Corolla Cross: Electronic Brake Booster Motor "A" Power Supply Circuit "A" Internal Electronic Failure (C145D49,C145D71)

DESCRIPTION

The main relay is built into the electric brake booster (brake booster with master cylinder assembly).

When the electric brake booster (brake booster with master cylinder assembly) detects a malfunction in a circuit necessary for main relay to operate, or in the main relay itself, this DTC is stored.

MONITOR DESCRIPTION

• When the power supply voltage of the electric brake booster (brake booster with master cylinder assembly) is a certain value or more, the electronically controlled brake system is starting, and a main relay malfunction inside the electric brake booster (brake booster with master cylinder assembly) is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

• When a main relay malfunction inside the electric brake booster (brake booster with master cylinder assembly) is detected during the self-diagnosis that is performed during startup of the electronically controlled brake system, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

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.

1. Connect the GTS to the DLC3.
2. Turn the ignition switch to ON and turn the GTS on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off.
5. Turn the ignition switch to ON (READY) and turn the GTS on.
6. 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.

7. Enter the following menus: Chassis / Brake Booster / Utility / All Readiness.
8. 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.

PROCEDURE

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