Inspection Procedure

1. Use the Data List to check if the IG2 relay is functioning properly.

   Main Body 

   TESTER DISPLAY REFERENCE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG2 Relay Monitor (Inside)	IG2 inner relay monitor/ON or OFF	ON: Engine switch on (IG) OFF: Engine switch off	-

   OK: When the engine switch is turned on (IG), ON is displayed on the Techstream. 

NG: Go to step  3

OK: Go to Next Step 

1. Ensure the key is inside the cabin.
2. Check that the power source mode changes as shown below each time the engine switch is pushed.

   OK: off → on (ACC) → on (IG) → off 

NG: GO TO POWER SOURCE MODE DOES NOT CHANGE 

OK: NORMAL 

1. Remove the ignition relay No. 2 from the engine room No. 2 junction block.
Fig 1: Inspecting Ignition Relay No.2 (IG2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   3-5	When battery voltage is not applied to terminals land 2	10 kΩ or higher
   3-5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

NG: REPLACE IGNITION RELAY NO.2 (IG2) 

OK: Go to Next Step 

Fig 2: Identifying L12 Main Body ECU Connector And IG2 Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the IG2 relay from the engine room No. 2 junction block.
2. Disconnect the L12 main body ECU connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   Relay block IG2 relay terminal 1 - L12-11 (IG2D)	Always	Below 1 Ω
   Relay block IG2 relay terminal 2 - Body ground	Always	Below 1 Ω
   Relay block IG2 relay terminal 1 or L12-11 (IG2D) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE MAIN BODY ECU