DTC B2273: Ignition 2 Monitor Malfunction: Procedure

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG) and press Techstream main switch on.
3. Read the Data List according to the displays on the tester.
   POWER SOURCE CONTROL:
   
   

   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 (IG2 relay is ON) OFF: Engine switch OFF (IG2 relay is OFF)	-

   OK

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

   Result

   Condition	Proceed to
   NG	C
   OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)	B
   OK (When troubleshooting according to the DTC chart)	A

B → PROCEED TO  PROBLEM SYMPTOMS TABLE  NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

C → See step   2 

A → REPLACE POWER SOURCE CONTROL ECU 

1. Remove the IG2 relay from the engine room R/B.
   Fig 1: Identifying IG2 Relay Connector Terminals

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

   Resistance

   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)

NG → REPLACE RELAY 

OK: Go to next step 

1. Remove the IG2 relay from the engine room J/B and R/B.
   Fig 2: Identifying IG2 Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D44 ECU connector.
   Fig 3: Identifying D44 ECU Connector Terminals

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

   Resistance

   Terminal No. (Symbol)	Specified Condition
   Engine Room R/B IG2 relay terminal 1 - D44-35 (IG2D)	Below 1 Ω
   Engine Room R/B IG2 relay terminal 2 - Body ground	Below 1 Ω
   D44-35 (IG2D) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE POWER SOURCE CONTROL ECU