A/C Idle-Up Signal

Bring engine to normal operating temperature and run at idle. With idle-up valve connector attached, use a voltmeter between terminal "A" and ground. See Fig 1 . Turn A/C switch to the "ON" position and blower switch to "HIGH" position. Ensure 12 volts are present. If not within specification, check the A/C switch, relay, blower switch and wiring harness.

Fig 1: Testing Idle-Up Signal

Courtesy of MAZDA MOTORS CORP.