Dtc B2273 Ignition 2 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)
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.
- 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 |
AM2 fuse
IG2 relay
Power source control ECU
Wire harness or connector
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Remove the AM2 fuse from the cowl side J/B RH.
Measure the resistance of the fuse.
- Standard resistance:
- Below 1 Ω
| 5.CHECK WIRE HARNESS (ENGINE ROOM R/B NO. 2 - POWER SOURCE CONTROL ECU) |
Measure the resistance according to the value(s) in the table below.
- 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 |
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 |
| 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 |
| J55-35 (IG2D) - 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 |
|
|
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.
| | REPLACE POWER SOURCE CONTROL ECU |
|
|
| OK | |
| |
| 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 |
| J55-35 (IG2D) - 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 |
|
|
| 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 |
| J55-35 (IG2D) - 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 |
|
|
LEXUS IS250, IS220d / GSE20 ALE20
