C1453

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1453,C1454: Reservoir Level Switch Disconnected

DESCRIPTION

The brake fluid level warning switch sends the appropriate signal to the skid control ECU when the brake fluid level drops.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the master cylinder solenoid, perform calibration Programming and Relearning.

PROCEDURE

1. CHECK BRAKE FLUID LEVEL

(a) Turn the engine switch off.

(b) Depress the brake pedal 40 times or more (until the pedal reaction feels light and pedal stroke becomes longer).

(c) Check the amount of fluid in the brake reservoir.

HINT
When the engine switch is turned on (IG), brake fluid is sent to the accumulator and the fluid level decreases by approximately 5 mm (0.197 in.) from the level when the engine switch is off (normal).

OK:

Brake fluid level is normal.

NG -- CHECK AND REPAIR BRAKE FLUID LEAK
OK -- Continue to next step.

2. INSPECT BRAKE FLUID LEVEL WARNING SWITCH

(a) Disconnect the A34 brake fluid level warning switch connector.

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





HINT
A float is placed inside the reservoir. Its position can be changed by increasing/decreasing the level of brake fluid.

Standard Resistance:





Text in Illustration





HINT
If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

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

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

(a) Disconnect the A7 skid control ECU connector.

(b) Disconnect the A34 brake fluid level warning switch connector.

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

Standard Resistance:





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

4. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the engine switch off.

(c) Start the engine and idle it for approximately 40 seconds.

(d) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE MASTER CYLINDER SOLENOID Disassembly

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting