Dtc B2271 Ignition Hold 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)

INSPECT JUNCTION BLOCK

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

CHECK WIRE HARNESS (COWL SIDE J/B LH - BODY GROUND)

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

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 B2271 Ignition Hold Monitor Malfunction


DESCRIPTION

This DTC is output when a problem such as an open in the AM2 fuse, an open or short in the wire harness between the fuse and power source control ECU, a short in the IG output circuit inside the power source control ECU, a short between the power source control ECU and relay, and a short in the relay is detected.
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
B2271
Hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside power source control ECU is open or short
  1. AM2 fuse
  2. IG2 relay
  3. Cowl side J/B RH
  4. Cowl side J/B LH
  5. Power source control ECU
  6. Wire harness or connector

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2271 Ignition Hold 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 B2271 Ignition Hold 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 B2271 Ignition Hold Monitor Malfunction

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

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

    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 10
OK


5.INSPECT JUNCTION BLOCK


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2271 Ignition Hold Monitor Malfunction

  1. RH-IG relay:

    1. Disconnect the cowl side J/B RH connectors.

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

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      RD-6 - RA-5 or RD-7
      		Always
      		136 to 250 Ω at 20°C (68°F)
      RD-6 - Body ground
      		Always
      		10 kΩ or higher


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2271 Ignition Hold Monitor Malfunction

  1. LH-IG relay:

    1. Disconnect the cowl side J/B LH connectors.

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

      Standard resistance:
      Tester Connection
      		Condition
      		Specified Condition
      LD-13 - LD-8 or LD-9
      		Always
      		68 to 250 Ω at 20°C (68°F)
      LD-13 - Body ground
      		Always
      		10 kΩ or higher


NG
Go to step 10
OK


6.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2271 Ignition Hold Monitor Malfunction

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-34 (IG1D) - Body ground
    		Always
    		10 kΩ or higher
    J55-35 (IG2D) - Body ground
    		Always
    		10 kΩ or higher


NG
Go to step 11
OK


7.CHECK WIRE HARNESS (COWL SIDE J/B LH - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2271 Ignition Hold Monitor Malfunction

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    LD-13 - Body ground
    		Always
    		10 kΩ or higher


NG
Go to step 11
OK


8.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2271 Ignition Hold Monitor Malfunction

  1. Reconnect the J55 ECU and J/B connectors.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-34 (IG1D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.
    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


9.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 B2271 is not output.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

CHECK INTERMITTENT PROBLEMS

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


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2271 Ignition Hold 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
    J55-34 (IG1D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.
    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

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


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2271 Ignition Hold 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
    J55-34 (IG1D) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.
    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