Inspection Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Select Active Test mode on the Techstream (See DATA LIST / ACTIVE TEST  ).

   ABS/VSC/TRAC 

   ABS/VSC/TRAC ACTIVE TEST REFERENCE CHART
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Motor Relay	ABS motor relay	Relay ON/OFF	Operating sound of motor can be heard

4. Check for the operating sound of the ABS motor relay when operating it using the Techstream.

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   The operating sound is not heard	A
   The operating sound is heard	B

   B: Go to step  3

   A: Go to next step 

1. Turn the ignition switch off.
2. Disconnect the skid control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   RESISTANCE SPECIFIED CONDITIONS
   
   

   Tester Connection	Condition	Specified Condition
   A38-13 (GND2) - Body ground	Always	Below 1 Ω

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT) 

   Fig 1: Identifying Terminal GND2 Of A38 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

HINT:

This code is detected when a problem is identified in the brake actuator assembly.

The ABS motor relay is in the brake actuator assembly. Therefore, ABS motor relay inspection and motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.

1. Turn the ignition switch off.
2. Reconnect the skid control ECU connector.
3. Clear the DTCs (See DTC CHECK / CLEAR  ).
4. Start the engine.
5. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.
6. Check if the same DTC is recorded (See DTC CHECK / CLEAR  ).

   Result 

   DTC OUTPUT RESULT
   
   

   Result	Proceed to
   DTC (C1251/51) is not output	A
   DTC (C1251/51) is output	B

   HINT:

   • If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU with the ignition switch ON and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
   • If the normal system code is output (no trouble codes are output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
   • If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness.
   • It is suspected that the DTCs were output due to a bad connection of the connector terminal.

     B: REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL  )

     A: CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)  (See DIAGNOSIS SYSTEM  )