LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (HVAC Systems - Manual) >> Diagnostic Tests >> DTC P1539: Compressor Relay Stuck On

DTC P1539: Compressor Relay Stuck On

WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit reference, see CONNECTOR IDENTIFICATION  and/or WIRING DIAGRAMS  .
  1. If diagnostic system check was performed, go to next step. If diagnostic system check was not performed, go to DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
  2. If DTC P0645 is set, diagnose it before performing this test. Connect scan tool to DLC. Start engine. Turn A/C off. Using scan tool, observe A/C REQUEST SIGNAL and A/C RELAY COMMAND parameters in POWERTRAIN, ENGINE DATA 2 list. If A/C REQUEST SIGNAL displays YES, and A/C RELAY COMMAND displays RELAY ON when A/C is not requested, go to TEST F: COMPRESSOR CLUTCH DOES NOT ENGAGE  or TEST G: COMPRESSOR CLUTCH DOES NOT DISENGAGE . If A/C REQUEST SIGNAL does not display YES, and A/C RELAY COMMAND does not display RELAY ON when A/C is not requested, go to next step.
  3. Using scan tool, observe A/C CLUTCH FEEDBACK SIGNAL in POWERTRAIN, ENGINE DATA 2 list. If A/C CLUTCH FEEDBACK SIGNAL displays DISENGAGED, go to next step. If A/C CLUTCH FEEDBACK SIGNAL does not display DISENGAGED, problem is intermittent. Check wiring harness and connectors for damage or defects.
  4. Turn ignition off. Remove compressor relay. If A/C CLUTCH FEEDBACK SIGNAL displays DISENGAGED, go to step  6. If A/C CLUTCH FEEDBACK SIGNAL does not display DISENGAGED, go to next step.
  5. Check compressor relay voltage supply circuit for a short to voltage. If a short to voltage was found, repair as necessary and go to step  8. If a short to voltage was not found, go to step  7.
  6. Replace compressor relay. See COMPRESSOR CLUTCH RELAY  under REMOVAL & INSTALLATION. After repairs are complete, go to step  8.
  7. Replace PCM and recalibrate. See REMOVAL, OVERHAUL & INSTALLATION - CAMARO & FIREBIRD article in ENGINE PERFORMANCE. If replacement is complete, go to next step.
  8. Using scan tool, clear DTC. Start engine and operate system to verify DTC does not reset. If DTC resets, go to step  2. If DTC does not reset, system is okay.
scientia non olet · About LEMON Manuals