C1202

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.
If the DTC for the fluid level drop is memorized, the warning will be canceled and the DTC will not be stored when the fluid level returns to normal.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: When replacing the skid control ECU, perform initialization and calibration of the linear solenoid valve. Initialization
HINT: When releasing the parking brake, chock the wheels for safety.

PROCEDURE

1. CHECK BRAKE FLUID LEVEL





(a) Check that the brake fluid level is sufficient.
OK:
Brake fluid level is sufficient.

HINT:
- If the fluid level drops, check for fluid leaks, and repair as necessary.
- Check for brake fluid leakage (Connection between the accumulator and brake actuator, and the brake actuator and wheel cylinders).
- If no leak exists, add and adjust fluid and then check that the trouble code is not output again.





(b) Check that there are no leaks from the connections between the brake booster pump and brake actuator.
HINT: As a visual check is very difficult, perform the check with the following procedure.

(1) Bleed air from the brake actuator.
(2) Connect the Techstream to the DLC3.
(3) Turn the power switch on (IG).
(4) Select the Data List mode on the Techstream. Data List / Active Test






(5) Wait a few minutes without operating the brake pedal.
(6) Check that the output value of the accumulator pressure sensor does not decrease and that the pump motor is not activated due to a decrease in accumulator pressure.
OK:
Accumulator pressure does not decrease and the pump motor is not activated due to a decrease in accumulator pressure.
NG -- CHECK AND REPAIR BRAKE FLUID LEAKAGE OR ADD FLUID
OK -- Continue to next step.
2. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
(a) Turn the power switch off.





(b) Remove the reservoir filler cap and strainer.
(c) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(d) Disconnect the brake fluid level warning switch connector.
(e) Measure the resistance according to the value(s) in the table below.
HINT: A float is located inside the reservoir. Its position changes according to the level of brake fluid.

Standard resistance:





HINT: If there are no problems after completing the preceding inspection, adjust the brake fluid to the MAX level with the power switch on (IG).

NG -- REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE FLUID LEVEL WARNING SWITCH)
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.





(b) Disconnect the skid control ECU 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. INSPECT SKID CONTROL ECU (SWITCH INPUT)





(a) Reconnect the skid control ECU connector and the brake fluid level warning switch connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE SKID CONTROL ECU
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTCs.
(c) Turn the power switch on (IG).
(d) Check if the same DTC is recorded.
Result:





HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step.

B -- REPLACE SKID CONTROL ECU
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)