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P0645 - A/C Clutch Relay Control Circuit

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0645 - A/C CLUTCH RELAY CONTROL CIRCUIT

Description:  Monitors the A/CCR circuit output from the PCM. The test fails if the PCM grounds the A/CCR circuit, and excessive current draw is detected on the A/CCR circuit; or, with the A/CCR circuit not grounded by the PCM, voltage is not detected on the A/CCR circuit. The PCM expects to detect VPWR voltage coming through the A/CCR relay coil to the A/CCR circuit.
Possible Causes: 
  • Open or shorted A/CCR circuit
  • Damaged A/CCR relay
  • Open VPWR circuit to the A/CCR relay
Diagnostic Aids:  The WACF PID is for the A/CCR circuit. When the WACF PID reads YES, a concern is currently present. An open circuit or short to ground can only be detected when the PCM is not grounding the circuit. A short to voltage can only be detected when the PCM is grounding the circuit. During the KOEO and KOER self-test, the A/CCR circuit is cycled on and off. Verify the A/C and defrost were off during the KOEO and KOER self-tests. Check the ACCS PID to verify.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST KM .
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