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DATACENTER ERROR!!! Внимание! Авария в датацентре!!


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Diagnosis and repair



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The WAC output (Pin 54) is used by the Powertrain Control Module (PCM) to disengage the A/C clutch when compressor operation is not desirable. Under normal conditions, with the A/C off, the PCM will ground the WAC output, which opens the normally closed WAC relay. When the A/C demand switch is turned on, and the cyclic pressure switch/low pressure switch is closed, voltage is supplied to the WAC relay contacts and to the ACC/S circuit (Pin 10). The voltage on the ACC/S circuit indicates to the PCM that A/C is requested. The PCM will then verify that A/C clutch operation is desirable (ex. engine not cranking or overheated, not at WOT, etc.) If A/C clutch operation is desirable the PCM will adjust idle speed as necessary and "unground" the WAC output, which closes the normally closed WAC relay and allows voltage to be supplied to the A/C clutch.
A/C Circuit SchematicA/C Circuit Schematic



The WAC output (Pin 54) is used by the Powertrain Control Module (PCM) to disengage the A/C clutch when compressor operation is not desirable. Under normal conditions, with the A/C off, the PCM will ground the WAC output, which opens the normally closed WAC relay. When the A/C demand switch is turned on, and the cyclic pressure switch/low pressure switch is closed, voltage is supplied to the WAC relay contacts and to the ACC/S circuit (Pin 10). The voltage on the ACC/S circuit indicates to the PCM that A/C is requested. The PCM will then verify that A/C clutch operation is desirable (ex. engine not cranking or overheated, not at WOT, etc.) If A/C clutch operation is desirable the PCM will adjust idle speed as necessary and "unground" the WAC output, which closes the normally closed WAC relay and allows voltage to be supplied to the A/C clutch.



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