Master Reservoir Level Malfunction - Electronically Controlled Brake System

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1202/68: Master Reservoir Level Malfunction

DTC C1202/68 - Master Reservoir Level Malfunction

DESCRIPTION

When a fluid level drop in the master cylinder reservoir is detected, the signal is input to the skid control ECU. When the DTC for the fluid level drop is memorized, the warning is canceled if the fluid level returns to normal and the other DTCs are not input.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration Initialization.
HINT: When releasing the parking brake, set wheel chocks to hold the vehicle for safety.

PROCEDURE

1. CHECK BRAKE FLUID LEVEL IN RESERVOIR
(a) Check that the brake fluid level is sufficient.
HINT:
- If the fluid level drops, check for a fluid leak, and repair if found.
- If no leaks exist, add and adjust fluid and then check that the trouble code is not output again.

OK:
Brake fluid level is proper.
NG -- ADD BRAKE FLUID
OK -- Continue to next step.

2. INSPECT BRAKE FLUID LEVEL WARNING SWITCH




(a) Remove the reservoir tank cap and strainer.
(b) Disconnect the brake fluid level warning switch connector.
(c) Measure the resistance of the switch.
Standard resistance:






NG -- REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY
OK -- Continue to next step.

3. CHECK WIRE HARNESS (SKID CONTROL ECU - BRAKE FLUID LEVEL WARNING SWITCH)




(a) Disconnect the S10 ECU connector.
(b) Disconnect the B1 switch connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

4. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the power switch ON (READY).
(c) Check that the same DTCs are recorded Reading and Clearing Diagnostic Trouble Codes.
HINT: This DTC may be memorized due to a malfunction in the connector terminal connection, etc.

Result





B -- END
A -- REPLACE SKID CONTROL ECU