Vehicle Stability Control System (For Hatchback With Separate Type Yaw Rate Sensor) Abs Warning Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK CAN COMMUNICATION SYSTEM

INSPECT BATTERY

CHECK TERMINAL VOLTAGE (IG1 TERMINAL)

CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

READ VALUE USING TECHSTREAM (ABS WARNING LIGHT)

REPLACE COMBINATION METER ASSEMBLY

CHECK COMBINATION METER ASSEMBLY

DESCRIPTION

1. The skid control ECU (brake actuator assembly) connectors are disconnected from the skid control ECU (brake actuator assembly).
   
2. There is a malfunction in the skid control ECU (brake actuator assembly) internal circuit.
   
3. There is an open in the harness between the combination meter and the skid control ECU (brake actuator assembly).
   
4. The ABS control system is defective.
   

HINT:

In some cases, the Techstream cannot be used when the skid control ECU (brake actuator assembly) is abnormal.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR07EX.html).
   
2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   

1. Check if the skid control ECU connector is securely connected.
   

   OK:

   The connector is securely connected.
   

1. Check if CAN communication system DTCs are output (YARIS_NCP93 RM000001RSW02LX.html).
   

1. Check the battery voltage.
   

   Standard voltage:

   11 to 14 V
   

1. Disconnect the skid control ECU (brake actuator assembly) connector.
   

2. Turn the ignition switch to ON.
   

3. Measure the voltage according to the value(s) in the table below.
   

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A70-34 (IG1) - Body ground	Ignition switch ON	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Skid control ECU)

4. Turn the ignition switch off.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A70-1 (GND1) - Body ground	Always	Below 1 Ω

   Text in Illustration

   *a	Front view of wire harness connector (to Skid control ECU)

2. Reconnect the skid control ECU (brake actuator assembly) connector.
   

1. Connect the Techstream to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the Techstream on.
   

4. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
   

5. According to the display on the Techstream, read the Data List.
   
   

   ABS/VSC/TRAC

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   ABS Warning Light	ABS warning light/OFF or ON	OFF: Warning light OFF ON: Warning light ON	-

6. When performing the ABS Warning Light Active Test, check ABS Warning Light in the Data List.
   

1. Turn the ignition switch off.
   

2. Replace the combination meter assembly (YARIS_NCP93 RM0000035EJ00BX.html).
   

1. Connect the Techstream to the DLC3.
   

2. Perform Active Test of the combination meter assembly using the Techstream (YARIS_NCP93 RM0000035EJ00BX.html).
   

   OK:

   The ABS warning light turns on or off in accordance with the Techstream.