DTC P0645: Air Conditioning Clutch Relay (A/CCR) Primary Circuit Malfunction
P0645 - AIR CONDITIONING CLUTCH RELAY (A/CCR) PRIMARY CIRCUIT MALFUNCTION
| Description: | Monitors the A/CCR circuit output from the powertrain control module (PCM). The test fails when the PCM grounds the A/CCR circuit, 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). | ||
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| Diagnostic Aids: | The A/CCR control circuit can be monitored using the WACF and WAC PID. When the WACF PID reads YES, a concern is 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 key on engine off (KOEO) and key on engine running (KOER) self-test, the WAC circuit is cycled on and off. Verify the A/C and the defrost were OFF during the KOEO and KOER self-tests. Check ACCS the PID to verify. If the vehicle is not equipped with A/C, DTC P0645 can be ignored. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test KM . | ||