Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM
PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE INTAKE AIR CONTROL VALVE)
CHECK INTAKE AIR CONTROL VALVE ASSEMBLY (OPERATION)
CHECK HARNESS AND CONNECTOR (INTAKE AIR CONTROL VALVE - ECM, EFI NO. 2 FUSE)
DTC P0660 Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)
DESCRIPTION
When the Intake Air Control Valve (IACV) opens and closes, the ACIS control circuit causes the engine load intake efficiency to increase. When the engine is running at 2,450 to 4,100 rpm and the throttle valve opening angle is 30°or more, current flows through the ACIS control circuit and the IACV closes. For all other situations, current does not flow through the ECM and the IACV is open.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0660 | The following conditions are met simultaneously for 0.5 seconds or more (2 trip detection logic): Voltage of terminal ACIS of the ECM is low when the VSV is OFF. The engine has been started. | Open or short in intake control valve circuit Surge tank (intake air control valve) ECM |
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE INTAKE AIR CONTROL VALVE) |
Connect the intelligent tester to the DLC3.
Start the engine and turn the tester II ON.
Enter the following menus: Power train / Engine / Active Test / Activate the VSV for Intake Control.
Check if operating noise can be heard when operating the intake control valve using the intelligent tester.
- OK:
- Operating noise can be heard.
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| NG | |
| 2.CHECK INTAKE AIR CONTROL VALVE ASSEMBLY (OPERATION) |
Disconnect the E50 intake air control valve connector.
Apply battery voltage between the terminals of the intake air control valve connector.
Check intake air control valve operation.
- OK:
- Operating noise can be heard.
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| OK | |
| 3.CHECK HARNESS AND CONNECTOR (INTAKE AIR CONTROL VALVE - ECM, EFI NO. 2 FUSE) |
Check the wire harness between the intake air control valve connector and the ECM connector.
Disconnect the E50 intake air control valve connector.
Disconnect the E5 ECM connector.
Measure the resistance of the harness side connectors.
- Standard resistance (Check for open):
Tester Connection Specified Condition E50-1 - ACIS (E5-3) Below 1 Ω
- Standard resistance (Check for short):
Tester Connection Specified Condition E50-1 or ACIS (E5-3) - Body ground 10 kΩ or higher
Check the wire harness between the intake air control valve connector and the EFI NO. 2 fuse.
Disconnect the intake air control valve connector.
Remove the EFI NO. 2 fuse from the engine room No. 2 junction block.
Measure the resistance of the wire harness side connectors.
- Standard resistance (Check for open):
Tester Connection Specified Condition E50-2 - EFI NO. 2 fuse (2) of Engine room No. 2 relay block Below 1 Ω
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| OK | ||
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