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HOMESERVICE MANUALSCHEVROLET1995CAVALIER LS, 2D CONVERTIBLE, 2.2 4, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 2.3L (W/O OBD-II)DIAGNOSTIC CHARTSCHART C-10, A/C COMPRESSOR CLUTCH CKT DIAGNOSIS (1 OF 2) M/TNOTES
1995 Chevrolet Cavalier LS, 2D Convertible, 2.2 4, Standard

Chart C-10, A/C Compressor Clutch CKT Diagnosis (1 Of 2) M/T: Notes

1995 Chevrolet Cavalier LS, 2D Convertible, 2.2 4, StandardSECTION Notes

A/C compressor clutch relay is controlled by the Powertrain Control Module (PCM). The PCM provides a ground on circuit No. 459 and A/C is requested. PCM will delay A/C compressor clutch engagement momentarily after A/C is requested. This delay allows Idle Air Control (IAC) valve to adjust engine RPM for additional load.

PCM will temporarily disengage A/C compressor clutch for a precalibrated time during one or more of the following conditions: hot engine restart, Wide Open Throttle (WOT), engine RPM greater than 6000 RPM and IAC reset. A/C compressor clutch will remain disengaged if Diagnostic Trouble Code (DTC) 66 is present, refrigerant pressure is too low or high, and no A/C request signal exists from A/C select switch or circuit.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. If DTCs are present, diagnose DTCs first. See appropriate TESTS W/CODES - 2.3L (W/O OBD-II) article in this section. PCM will energize A/C compressor clutch relay only when engine is running. This test determines whether relay or circuit No. 459 is faulty.
  2. Determines if signal is reaching PCM through circuit No. 66 from A/C control panel. Signal should only be present when A/C mode or defrost mode is selected.
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