Detection Condition

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0645 or P1460 indicates excessive current draw is detected on A/C Clutch Relay (ACCR) circuit when PCM grounds the circuit or voltage is not detected on ACCR circuit when circuit is not grounded by PCM.

Wide Open Throttle Air Conditioning Cut-Off (WAC) output is used by PCM to disengage A/C clutch when A/C operation is desirable. Under normal conditions (A/C off), PCM will ground WAC output which opens normally closed A/C clutch relay. When A/C demand switch is on, and A/C cycling switch and A/C high pressure switch contacts are closed, voltage is supplied to A/C clutch relay and to A/C Control Signal (ACCS) circuit. Voltage on ACCS circuit indicates to PCM that A/C is requested. PCM will verify A/C clutch operation is desirable and adjust idle speed as necessary and unground WAC output. This closes normally closed WOT A/C clutch relay and allows voltage to A/C clutch.