DTC B2273: Ignition 2 Monitor Malfunction: Procedure

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

   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 → See 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 → See step   5 

OK → NORMAL 

1. Remove the IG2 relay from the engine room No. 2 junction block.
   Fig 1: Inspecting Starter Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	When battery voltage is not applied to terminals 1 and 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: Checking Harness And Connector (IG2 Relay - Main Body ECU And Body Ground)

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

   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