Dtc B2273 Ignition 2 Monitor Malfunction

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Starting. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (AM2)

CHECK CONNECTORS

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

INSPECT RELAY (IG2)

CHECK WIRE HARNESS (ENGINE ROOM R/B NO. 2 - POWER SOURCE CONTROL ECU)

INSPECT POWER SOURCE CONTROL ECU

RECHECK FOR DTC

REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU

REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU

DTC B2273 Ignition 2 Monitor Malfunction


DESCRIPTION

This DTC is output when there is a problem in the IG2 output circuit, which is from the inside of the power source control ECU to the IG2 relay.
HINT:
When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No.
DTC Detection Condition
Trouble Area
B2273
IG2 relay actuation circuit inside power source control ECU or other related circuit is malfunctioning
  1. AM2 fuse
  2. IG2 relay
  3. Power source control ECU
  4. Wire harness or connector

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2273 Ignition 2 Monitor Malfunction


INSPECTION PROCEDURE

1.INSPECT FUSE (AM2)

  1. Remove the AM2 fuse from the cowl side J/B RH.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


2.CHECK CONNECTORS

  1. Check that the connectors are securely connected and the terminals are not deformed or loose.

    OK:
    The connectors are securely connected and the terminals are not deformed or loose.


NG
REPAIR OR REPLACE CONNECTORS
OK


3.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2273 Ignition 2 Monitor Malfunction

  1. Disconnect the J55 ECU connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-33 (AM1) - Body ground
    		Always
    		10 to 14 V
    J55-12 (AM2) - Body ground
    		Always
    		10 to 14 V

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-6 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT RELAY (IG2)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2273 Ignition 2 Monitor Malfunction

  1. Remove the IG2 relay from the engine room R/B No. 2.

  1. Measure the resistance of the relay.

    Standard 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
Go to step 8
OK


5.CHECK WIRE HARNESS (ENGINE ROOM R/B NO. 2 - POWER SOURCE CONTROL ECU)


  1. Measure the resistance according to the value(s) in the table below.


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2273 Ignition 2 Monitor Malfunction

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    Engine room R/B No. 2 IG2 relay terminal 2 - J55-35 (IG2D)
    		Always
    		Below 1 Ω
    Engine room R/B No. 2 IG2 relay terminal 1 - Body ground
    		Always
    		Below 1 Ω
    Engine room R/B No. 2 IG2 relay terminal 2 or J55-35 (IG2D) - Body ground
    		Always
    		10 kΩ or higher


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2273 Ignition 2 Monitor Malfunction

  1. Install the IG2 relay.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-35 (IG2D) - Body ground
    		Engine switch on (IG)
    		Below 1 V


NG
Go to step 9
OK


6.INSPECT POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2273 Ignition 2 Monitor Malfunction

  1. Reconnect the J55 ECU connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-35 (IG2D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.


NG
REPLACE POWER SOURCE CONTROL ECU
OK


7.RECHECK FOR DTC

  1. Delete the DTCs (Click here).

  1. After DTCs are all cleared, turn the engine switch on (IG). After 30 seconds have elapsed, check for DTCs again.

    OK:
    DTC B2273 is not output.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

CHECK INTERMITTENT PROBLEMS

8.REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2273 Ignition 2 Monitor Malfunction

  1. Replace a faulty relay or J/B and then connect the power source control ECU connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-35 (IG2D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

END

9.REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2273 Ignition 2 Monitor Malfunction

  1. Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-35 (IG2D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

END