mazda Workshop Repair Guides

Mazda Workshop Service and Repair Manuals

Ambient Temperature Sensor / Switch HVAC > < Compressor Control (A/C Relay Signal) Inspection|Page 4608
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Air Conditioning Switch: Description and Operation

PURPOSE

Signals the powertrain control module engine (PCME) when A/C is running. PCME detects this condition and increases idle speed control valve
duty cycle signal (more "ON" time vs. "OFF" time).

OPERATION

When it receives the A/C signal, the PCME increases idle speed to compensate for the additional A/C compressor load and helps to insure efficient
A/C operation during engine idling.

Ambient Temperature Sensor / Switch HVAC > < Compressor Control (A/C Relay Signal) Inspection|Page 4608