Inspection Procedure

HINT:

If there is a battery voltage at the +B, MREL or IGSW terminal of the HV control ECU even though the power switch is turned OFF, the circuit is shorted to the +B power supply.

1. INSPECT INTEGRATION RELAY (IGCT RELAY AND IG2 RELAY) 
   1. Remove the integration relay from the engine room relay block.
   2. Inspect the IGCT relay.
      1. Measure the resistance between the terminals of the integration relay.

         Standard resistance 

         TERMINALS RESISTANCE SPECIFICATION
         
         

         Tester Connection	Specified Condition
         A4 - C1	10 kΩ or higher
         A4 - C1	Below 1 Ω (Apply battery voltage to terminals A2 and A3)

   3. Inspect the IG2 relay.
      1. Measure the resistance between the terminals of the integration relay.

         Standard resistance 

         TERMINALS RESISTANCE SPECIFICATION
         
         

         Tester Connection	Specified Condition
         B4 - C1	10 kΩ or higher
         B4 - C1	Below 1 Ω (Apply battery voltage to terminals B2 and B3)

   NG : REPLACE INTEGRATION RELAY (IGCT RELAY OR IG2 RELAY) 

   Fig 1: Identifying Integration Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPAIR OR REPLACE HARNESS AND CONNECTOR AFTER INSPECTION (HV CONTROL ECU - INTEGRATION RELAY)