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.
When the DTC for the fluid level drop is memorized, the warning is canceled and the DTC is not stored if the fluid level returns to normal.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration Programming and Relearning.

PROCEDURE

1. CHECK BRAKE FLUID LEVEL IN RESERVOIR
(a) Check that the brake fluid level is sufficient.
HINT:
- When releasing the parking brake, set the chocks to hold the vehicle for safety.
- If the fluid level drops, check for a fluid leak, and repair if found.
- If no leak exists, add and adjust fluid and then check that the trouble code is not output again.

OK:
Brake fluid level is proper.
NG -- CHECK AND REPAIR BRAKE FLUID LEAKAGE AND ADD FLUID
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.

Resistance:





HINT:
If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level with the engine switch on (IG).

NG -- REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO BRAKE FLUID LEVEL WARNING SWITCH)





(a) Disconnect the skid control ECU connector and brake fluid level warning switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT SKID CONTROL ECU (SWITCH INPUT VOLTAGE)





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






NG -- REPLACE SKID CONTROL ECU
OK -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTCs Electronically Controlled Brake System.
(b) Turn the engine switch on (IG).
(c) Check if the same DTC is recorded Electronically Controlled Brake System.
HINT:
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

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 Problem Symptoms Table.

B -- END
A -- REPLACE SKID CONTROL ECU