DTC B2273: Ignition 2 Monitor Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Read the Data List according to the displays on the Techstream.

   HINT: 

   When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts.

   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG2 Relay Monitor (Outside)	Status of IG2 relay monitor (outer) / ON or OFF	ON: Engine switch on (IG) (IG2 relay is ON) OFF: Engine switch off (IG2 relay is OFF)	-

   OK

   "ON" (Engine switch on (IG)) appears on the screen.

NG → See step   3 

OK: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch on (IG).
3. After 10 seconds have elapsed, check if the trouble occurs again.

   OK

   DTC B2273 is not output.

NG → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 

OK → See step   5 

1. Disconnect the 1A connector from the engine room junction block.
   Fig 1: Identifying 1A Engine Room Relay Block & E51 Instrument Panel Junction Block Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E51 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1A-2 - E51-5 (IG2D)	Always	Below 1 Ω
   1A-2 - Body ground	Always	10 kΩ or higher
   1A-3 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM JUNCTION BLOCK - MAIN BODY ECU AND BODY GROUND) 

OK: Go to next step 

1. Disconnect the 1E connector from the engine room relay block.
   Fig 2: Inspecting Engine Room Relay Block (IG2 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
   1A-4 - 1E-1	When battery voltage is not applied to terminals 1A-3 and 1A-2	10 kΩ or higher
   1A-4 - 1E-1	When battery voltage is applied to terminals 1A-3 and 1A-2	Below 1 Ω

NG → REPLACE ENGINE ROOM JUNCTION BLOCK 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)