Inspection Procedure using LEXUS hand held tester

PROCEDURE USING LEXUS HAND HELD TESTER
1. Connect the LEXUS hand-held tester and check operation of A/C idle-up Vacuum Switching Valve.





- Remove the fuse cover on the instrument panel. Connect the LEXUS hand-held tester to the Data Link Connector 3.
- Turn ignition switch ON and LEXUS hand- held tester main switch ON.
- Select the active test mode on the LEXUS hand-held tester.
- Check operation of A/C idle-up Vacuum Switching Valve when A/C idle-up Vacuum Switching Valve is operated by the LEXUS hand- held tester.

A/C idle-up Vacuum Switching Valve is ON: the air from port E is flowing out through port F.
A/C idle-up Vacuum Switching Valve is 0FF: the air does not flow from port E to port F.

- If not OK proceed to step 2.
- If OK check and repair air hose and air pipe.
2. Check A/C idle-up Vacuum Switching Valve.
- Remove A/C idle-up Vacuum Switching Valve. Disconnect A/C idle-up Vacuum Switching Valve connector.





- Measure resistance between terminals.

Resistance: 22 - 42 ohms at 20°C (68°F)

- Measure resistance between each terminal and the body.

Resistance: 1 M ohms or higher.

- Check operation of A/C idle-up Vacuum Switching Valve when battery positive voltage is applied to the terminals of A/C idle-up Vacuum Switching Valve connector.

Battery positive voltage is applied: the air from pipe E is flowing out through pipe F.
Battery positive voltage is NOT applied: The air from pipe E is NOT flowing out through pipe F.

- If OK proceed to step 3.
- If not OK replace A/C idle-up Vacuum Switching Valve.
3. Check for open and short in harness and connector between EFI Main Relay and Engine Control Module.
- If OK check and replace Engine Control Module
- If not OK repair or replace harness or connector.