Inspection Procedure

1. 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: Go to next step 

1. Disconnect the brake fluid level warning switch connector.
2. 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 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Condition	Specified Condition
   1 - 2	Float up (Switch OFF)	1.84 to 2.16 kΩ
   1 - 2	Float down (Switch ON)	Below 1 Ω

   HINT:

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

Fig 1: Inspecting Brake Fluid Level Warning Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY 

OK: Go to next step 

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

   Resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   A15-11 (LBL) - A22-2 (LBL)	Below 1 Ω
   A15-11 (LBL) - Body ground	10 kΩ or higher
   A22-1 (GND) - Body ground	Below 1 Ω

Fig 2: Identifying Skid Control ECU And Brake Fluid Level Warning Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU connector.
2. Disconnect the brake fluid level warning switch connector.
3. Turn the engine switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Voltage 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   A22-2 - Body ground	8 to 14 V

Fig 3: Identifying Brake Fluid Level Warning Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE SKID CONTROL ECU 

OK: Go to next step 

1. Clear the DTCs (see DTC CHECK / CLEAR ).
2. Turn the engine switch on (IG).
3. Check if the same DTC is recorded (see DTC CHECK / CLEAR ).

   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 (see PROBLEM SYMPTOMS TABLE ).

B: END 

A: REPLACE SKID CONTROL ECU