Inspection Procedure

1. Remove the IG2 relay from the engine room No. 1 relay block.
2. Measure the resistance of the relay.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   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)

Fig 1: Inspecting IG2 Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE IG2 RELAY 

OK: GO TO Next Step 

1. Remove the IG2 relay from the engine room No. 1 relay block.
2. Disconnect the K73 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   Engine room No. 1 relay block IG2 relay terminal 2 - K73-35 (IG2D)	Below 1 Ω
   Engine room No. 1 relay block IG2 relay terminal 1 - Body ground	Below 1 Ω
   K73-35 (IG2D) - Body ground	10 kΩ or higher

Fig 2: Identifying IG2 Relay From Engine Room No. 1 Relay Block Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO Next Step 

1. Measure the output voltage of the power source control ECU.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   35 (IG2D) - Body ground	Power switch ON (IG)	10 to 14 V

Fig 3: Identifying Power Source Control ECU (IG2D)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE POWER SOURCE CONTROL ECU 

OK: END