Inspection Procedure

HINT:

When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY)*1 
   1. Select the ACTIVE TEST, generate a control command, and then check that the ABS motor relay operates.

      Skid control ECU: 

      DATA LIST
      
      

      Item	Vehicle Condition / Test Details	Diagnostics Note
      ABS MOT RELAY	Turn ABS motor relay ON / OFF	Operation sound of motor can be heard

      OK: Operation sound of ABS motor is heard. 

   NG: Go to step  3

   OK: Go to Next step 

2. CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR)*2 

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY 

3. CHECK ENGINE ROOM RELAY BLOCK (ABS MTR 1 RELAY AND ABS MTR 2 RELAY)*2 
   1. Remove the ABS MTR 1 relay and ABS MTR 2 relay from the engine room relay block.
   2. Measure the voltage between terminal 1 of the engine room relay block (for ABS MTR 1 relay and ABS MTR 2 relay) and body ground.

      OK: 

      Standard voltage: 

      10 to 14 V 

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   Fig 1: Identifying ABS MTR 1 Relay And ABS MTR 2 Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next step 

4. INSPECT RELAY (Marking: ABS MTR 1, ABS MTR 2) 
   1. Remove the ABS MTR 1 relay and ABS MTR 2 relay from the engine room relay block.
   2. Measure the resistance of the relay.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      1 - 2	10 kΩ or higher
      1 - 2	Below 1 Ω (When battery voltage is applied to terminals 3 and 4)

   NG: REPLACE RELAY 

   Fig 2: Identifying Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next step 

5. INSPECT BRAKE ACTUATOR 
   1. Disconnect the A43 and A44 actuator connectors.
   2. Measure the resistance of the actuator.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      A43-2 (BM1) - A44-7 (MTT)	30 to 36 Ω
      A44-3 (BM2) - A44-7 (MTT)	30 to 36 Ω

   NG: REPLACE BRAKE ACTUATOR 

   Fig 3: Identifying A43 And A44 Actuator Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next step 

6. CHECK WIRE HARNESS (BRAKE ACTUATOR - SKID CONTROL ECU ASSEMBLY AND ABS MTR 1 AND ABS MTR 2 RELAY) 

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE SKID CONTROL ECU ASSEMBLY