Dtc B2272 Ignition 1 Monitor Malfunction

Lexus IS250 IS220d GSE20 ALE20 2AD-FHV STARTING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (AM2)

CHECK CONNECTORS

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

CHECK JUNCTION BLOCK

CHECK WIRE HARNESS (COWL SIDE J/B RH - POWER SOURCE CONTROL ECU AND BODY GROUND)

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 B2272 Ignition 1 Monitor Malfunction

DESCRIPTION

This DTC is output when there is a problem in the IG1 output circuit, which is from the inside of the power source control ECU to the RH-IG or LH-IG 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 ConditionTrouble Area
B2272 IG1 relay actuation circuit inside power source control ECU or other related circuit is malfunctioning
AM2 fuse
Cowl side J/B RH
Cowl side J/B LH
Power source control ECU
Wire harness or connector

WIRING DIAGRAM

Dtc B2272 Ignition 1 Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.INSPECT FUSE (AM2)

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

Measure the resistance of the fuse.

  • Standard resistance:
  • Below 1 Ω
NG
Go to step 8
OK
5.CHECK WIRE HARNESS (COWL SIDE J/B RH - POWER SOURCE CONTROL ECU AND BODY GROUND)
Dtc B2272 Ignition 1 Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    RD-6 - J55-34 (IG1D)AlwaysBelow 1 Ω
    RA-5 or RD-7 - Body groundAlwaysBelow 1 Ω
    RD-6 or J55-34 (IG1D) - Body groundAlways10 kΩ or higher
Dtc B2272 Ignition 1 Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    RD-12 - LD-13AlwaysBelow 1 Ω
    RD-12 - Body groundAlways10 kΩ or higher
    LD-8 - Body groundAlwaysBelow 1 Ω
    LD-9 - Body groundAlwaysBelow 1 Ω
Dtc B2272 Ignition 1 Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Connect each J/B connector with the power source control ECU connector disconnected.

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-34 (IG1D) - Body groundEngine switch on (IG)Below 1 V
NG
Go to step 9
OK
6.INSPECT POWER SOURCE CONTROL ECU
Dtc B2272 Ignition 1 Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Reconnect the J55 ECU connector.

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-34 (IG1D) - Body groundEngine switch offBelow 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

Delete the DTCs .

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

  • OK:
  • DTC B2272 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
Dtc B2272 Ignition 1 Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

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

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-34 (IG1D) - Body groundEngine switch offBelow 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
Dtc B2272 Ignition 1 Monitor Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

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

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-34 (IG1D) - Body groundEngine switch offBelow 1 V
    Engine switch on (IG)Output voltage at terminal AM2 is -2 V or more.
NG
REPLACE POWER SOURCE CONTROL ECU
OK
END