Dtc B2274 Acc 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 COWL SIDE JUNCTION BLOCK RH (ACC RELAY, PWR OUTLET RELAY)
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)
INSPECT POWER SOURCE CONTROL ECU
RECHECK FOR DTC
REPLACE FAULTY J/B AND CHECK POWER SOURCE CONTROL ECU
REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU
DTC B2274 ACC Monitor Malfunction
DESCRIPTION
This DTC is output when there is a problem in the ACC output circuit, which is from the inside of the power source control ECU to the ACC or PWR POINT 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 |
| B2274 |
ACC relay actuation circuit inside power source control ECU or other related circuit is malfunctioning |
AM2 fuse
Cowl side J/B RH
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 (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection (Symbols) | Condition | Specified Condition |
| J55-11 (ACCD) - RD-2 | Always | Below 1 Ω |
| J55-11 (ACCD) - Body ground | Always | 10 kΩ or higher |
| RA-5 - Body ground | Always | Below 1 Ω |
| RD-7 - 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 |
| J55-11 (ACCD) - 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 |
| J55-11 (ACCD) - 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 (ACC). After 30 seconds have elapsed, check for DTCs again.
- OK:
- DTC B2274 is not output.
| | REPLACE POWER SOURCE CONTROL ECU |
|
|
| OK | |
| |
| CHECK INTERMITTENT PROBLEMS |
|
| 8.REPLACE FAULTY J/B AND CHECK POWER SOURCE CONTROL ECU |
Replace a faulty J/B and then connector 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 |
| J55-11 (ACCD) - 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 |
| J55-11 (ACCD) - 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
