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.
- 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
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 (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 |
| 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 |
|
|
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 |
|
|
| 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 |
| J55-34 (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 |
|
|
| 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 |
|
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LEXUS IS250, IS220d / GSE20 ALE20
