4Gr-Fse Starting. Dtc B2272 Ignition 1 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)

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 Condition	Trouble 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

Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System.
Dtc
B2272 Ignition 1 Monitor Malfunction

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

REPLACE FUSE

OK

2.CHECK CONNECTORS

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.

REPAIR OR REPLACE CONNECTORS

OK

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

Disconnect the J55 ECU connector.

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

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK JUNCTION BLOCK

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 - RD-12
  Always
  Below 1 Ω
  RD-6 - Body ground
  Always
  10 kΩ or higher

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)

Go to step 8

OK

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

Measure the resistance according to the value(s) in the table below.
Standard resistance:
Tester Connection (Symbols)
Condition
Specified Condition
RD-6 - J55-34 (IG1D)
Always
Below 1 Ω
RA-5 or RD-7 - Body ground
Always
Below 1 Ω
RD-6 or J55-34 (IG1D) - Body ground
Always
10 kΩ or higher

Measure the resistance according to the value(s) in the table below.
Standard resistance:
Tester Connection
Condition
Specified Condition
RD-12 - LD-13
Always
Below 1 Ω
RD-12 - Body ground
Always
10 kΩ or higher
LD-8 - Body ground
Always
Below 1 Ω
LD-9 - Body ground
Always
Below 1 Ω

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)
Condition
Specified Condition
J55-34 (IG1D) - Body ground
Engine switch on (IG)
Below 1 V

Go to step 9

OK

6.INSPECT POWER SOURCE CONTROL ECU

Reconnect the J55 ECU connector.

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.

REPLACE POWER SOURCE CONTROL ECU

OK

7.RECHECK FOR DTC

Delete the DTCs (Click here).

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.

REPLACE POWER SOURCE CONTROL ECU

CHECK INTERMITTENT PROBLEMS

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

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)
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.

REPLACE POWER SOURCE CONTROL ECU

END

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

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)
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.

REPLACE POWER SOURCE CONTROL ECU

END

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

Tester Connection	Condition	Specified Condition
RD-6 - RA-5 or RD-7	Always	136 to 250 Ω at 20°C (68°F)
RD-6 - RD-12	Always	Below 1 Ω
RD-6 - Body ground	Always	10 kΩ or higher