Inspection Procedure

HINT:

Start the inspection from step  1 in case of using the hand-held tester and start from step  2 in case of not using the hand-held tester.

1. Check ABS solenoid relay operation. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch ON and push the hand-held tester main switch ON.
   3. Select the ACTIVE TEST mode on the hand-held tester.

      CHECK: 

      Check the operation sound of the ABS solenoid relay when operating it with the hand-held tester.

      OK: 

      The operation sound of the ABS solenoid relay should be heard. 

   1. OK: Go to step   6 . 
   2. NG: Go to next step. 
2. Check voltage between terminals 1 and 2 of engine room J/B (for ABS solenoid relay). 

   PREPARATION: 

   Remove the ABS solenoid relay from the engine room J/B.

   CHECK: 

   Measure the voltage between terminals 1 and 2 of the engine room J/B (for ABS solenoid relay).

   OK: 

   Voltage: 10 to 14 V 

   Fig 1: Measuring Voltage Between Terminals 1 & 2 Of Engine Room J/B (For ABS Solenoid Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Check and repair harness or connector. 
   2. OK: Go to next step. 
3. Check ABS solenoid relay. 

   CHECK: 

   Check continuity between each terminal of the ABS solenoid relay.

   OK: 

   ABS SOLENOID RELAY TERMINALS CONTINUITY
   
   

   Terminals 4 and 6	Continuity (Reference value 80 Ω)
   Terminals 2 and 3	Continuity
   Terminals 1 and 3	Open

   CHECK: 

   1. Apply battery positive voltage between terminals 4 and 6.
   2. Check continuity between each terminal of the ABS solenoid relay.

      OK: 

      ABS SOLENOID RELAY TERMINALS CONTINUITY
      
      

      Terminals 2 and 3	Open
      Terminals 1 and 3	Continuity

      Fig 2: Checking Continuity Between Each Terminal Of ABS Solenoid Relay

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace ABS solenoid relay. 
   2. OK: Go to next step. 
4. Check continuity between terminals 3 of ABS solenoid relay and terminal AST of skid control ECU. 

   CHECK: 

   Check continuity between terminal 3 of the ABS solenoid relay and terminal AST of the skid control ECU.

   OK: 

   Continuity 

   HINT:

   There is resistance of 33 +/- 3 Ω between terminals 4 of connector A43 and terminal 1 of connector A44.

   Fig 3: Checking Continuity Between Terminal 3 Of ABS Solenoid Relay & Terminal AST Of Skid Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Repair or replace harness, connector or hydraulic brake booster. 
   2. OK: Go to next step. 
5. Check for open and short circuit in harness and connector between ABS solenoid relay and skid control ECU (See  HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION  ). 
   1. NG: Repair or replace harness or connector. 
   2. OK: If the same code is still output after the DTC is deleted, check the contact condition of each connection. If the connections are normal, the ECU may be defective. 
6. Check for open circuit in harness and connector between AST of hydraulic brake booster and AST of skid control ECU (See  HOW TO USE THE DIAGNOSTIC TABLE AND INSPECTION  ). 
   1. NG: Repair or replace harness or connector. 
   2. OK: Replace hydraulic brake booster or skid control ECU.