A/C Idle-Up Circuit

A/C IDLE-UP CIRCUIT

CIRCUIT DESCRIPTION
When the air conditioning operates (increased engine load), this circuit switches the vacuum switching valve (VSV) ON and increases the amount of bypass air to increase the idle speed, thus maintaining driveability.

WIRING DIAGRAM

VSV For A/C Idle-Up Circuit:

INSPECTION PROCEDURE

Toyota hand-held tester













OBD II scan tool (excluding Toyota hand-held tester)