C1202

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1202/52: Brake Fluid Level Low / Open Circuit in Brake Fluid Level Warning Switch Circuit

DTC C1202/52 - Brake Fluid Level Low / Open Circuit in Brake Fluid Level Warning Switch Circuit

DESCRIPTION

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





HINT:
If the code C1202/52 is output, the following situations will occur:
- The BRAKE warning light and VSC OFF indicator light will come on.
- Control of all systems other than ABS and EBD is canceled.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTE: When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.

HINT: When C1241/41 is output together with C1202/52, inspect and repair the trouble areas indicated by C1241/41 first.

PROCEDURE

1. CHECK BRAKE FLUID LEVEL
(a) Turn the ignition switch off.
(b) Depress the brake pedal 20 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 ignition switch is turned to ON, brake fluid is sent to the accumulator and the fluid level decreases by approximately 5 mm (0.197 in.) from the level when the ignition switch is off (normal).

NOTE: Do not move the wheels with the ignition switch off.

OK:
Brake fluid level is proper.

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

2. INSPECT BRAKE FLUID LEVEL WARNING SWITCH




(a) Disconnect the 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.
- The warning switch is switched ON/OFF at +/- 5 mm (+/- 0.197 in.) from the MIN level.

Standard resistance:





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 SUB-ASSEMBLY
OK -- Continue to next step.

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




(a) Disconnect the skid control ECU connector.
(b) 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) Check if the same DTCs are detected Reading and Clearing Diagnostic Trouble Codes.

HINT: Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result:





B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE MASTER CYLINDER SOLENOID