Inspection Procedure

1. Remove the BRK relay from the engine room R/B No. 1.
2. Check operation of the BRK relay.

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Terminal No.	Condition	Specified Condition
   3 - 5	Always	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminal 1 and 2.	Below 1 Ω

NG: REPLACE BRK RELAY 

Fig 1: Identifying BRK Relay Of Engine Room R/B No. 1

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OK: Go to next step 

1. Disconnect the connector from the engine room R/B No. 1.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Terminal No.	Condition	Specified Condition
   5 - Body ground	Ignition switch on (IG)	10 to 14 V
   5 - Body ground	Ignition switch off	Below 1 V
   2 - Body ground	Ignition switch on (IG)	10 to 14 V
   2 - Body ground	Ignition switch off	Below 1 V

NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FAILURE RELAY (BRK RELAY) 

Fig 2: Identifying Wire Harness And Connector

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OK: Go to next step 

1. Disconnect the connector from the skid control ECU.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   Terminal No.	Condition	Specified Condition
   1 - A34-16 (STPO)	Always	Below 1 Ω
   A34-16 (STPO) - Body ground	Always	10 kΩ or higher
   4 - A34-21 (STP2)	Always	Below 1 Ω
   A34-21 (STP2) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying A34 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE SKID CONTROL ECU