Inspection Procedure

1. Select the ACTIVE TEST for the proper functioning of the ABS NO. 1 and ABS NO. 2 relays.

   Skid control ECU 

   ACTIVE TEST
   
   

   Item	Test Details	Diagnostic Note
   MAIN RELAY 2	Turns MAIN RELAY 1 ON / OFF	Operation of solenoid (clicking sound) can be heard
   MAIN RELAY 1	Turns MAIN RELAY 2 ON / OFF	Operation of solenoid (clicking sound) can be heard

   OK : Operation sound of ABS NO. 1 relay and ABS NO. 2 relay should be heard. 

NG : Go to step   3 

OK : GO TO NEXT STEP 

1. Measure the voltage of the connectors.

   HINT:

   Measure the voltage from behind the connector with the connector connected to the skid control ECU.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   S7-3 (BS1) - Body ground	10 to 14 V
   S10-7 (BS2) - Body ground	10 to 14 V

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 1: Checking Skid Control ECU (Bs1, Bs2 Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE SKID CONTROL ECU 

1. Remove the ABS MAIN1 and ABS MAIN2 fuses from the engine room relay block.
2. Measure the resistance of the fuses.

   Standard resistance: Below 1 Ω 

NG : CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE AND REPLACE FUSE 

Fig 2: Inspecting Fuse (ABS MAIN1, ABS MAIN2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

1. Remove the ABS NO. 1 and ABS NO. 2 relays from the engine room relay block.
2. Measure the resistance of the relays.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2

NG : REPLACE RELAY 

Fig 3: Inspecting ABS Main Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

1. Measure the voltage of the connectors.

   HINT:

   Measure the voltage from behind the connector with the connector connected to the skid control ECU.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   S8-3 (+BI1) - Body ground	10 to 14 V
   S9-5 (+BI2) - Body ground	10 to 14 V

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 4: Checking Skid Control ECU (+Bi1, +Bi2 Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

1. Measure the voltage of the connectors.

   HINT:

   Measure the voltage from behind the connector with the connector connected to the skid control ECU.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   S7-2 (R1+) - Body ground	10 to 14 V
   S8-5 (+BO1) - Body ground	10 to 14 V
   S9-4 (+BO2) - Body ground	10 to 14 V
   S10-17 (R2+) - Body ground	10 to 14 V

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 5: Checking Skid Control ECU (+BO1, +BO2, R1+, R2+ Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

1. Measure the voltage of the connectors.

   HINT:

   Measure the voltage from behind the connector with the connector connected to the skid control ECU.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   S7-3 (BS1) - Body ground	10 to 14 V
   S10-7 (BS2) - Body ground	10 to 14 V

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 6: Checking Skid Control ECU (BS1, BS2 Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE SKID CONTROL ECU