Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999CAVALIER Z24, 2D CONVERTIBLE, AUTOMATICREPAIR AND DIAGNOSISBODY & FRAMEBODY, CAB CONTROL SYSTEMSMULTIFUNCTION ALARM MODULESYSTEM TESTSDATA LINK COMMUNICATIONS DIAGNOSTIC SYSTEM CHECK
1999 Chevrolet Cavalier Z24, 2D Convertible, Automatic
Data Link Communications Diagnostic System Check
1999 Chevrolet Cavalier Z24, 2D Convertible, AutomaticSECTION Data Link Communications Diagnostic System Check
- Connect scan tool to Data Link Connector (DLC). Attempt to communicate with modules applicable to vehicle. If scan tool communicates, go to next step. If scan tool does not communicate, go to SCAN TOOL DOES NOT COMMUNICATE WITH COMPONENTS under SYSTEM TESTS.
- Access Diagnostic Trouble Codes (DTCs) with scan tool. If DTCs are found, go to appropriate diagnostic and repair procedure for appropriate module DTCs were set in. If no DTCs are set, go to next step.
- Attempt to communicate with Sensing and Diagnostic Module (SDM) for air bag. If scan tool communicates, go to next step. If scan tool does not communicate, go to SCAN TOOL DOES NOT COMMUNICATE WITH SDM under SYSTEM TESTS.
- Attempt to communicate with Electronic Brake Control Module (EBCM) for ABS. If scan tool communicates, go to next step. If scan tool does not communicate, go to SCAN TOOL DOES NOT COMMUNICATE WITH EBCM under SYSTEM TESTS.
- Attempt to communicate with Powertrain Control Module (PCM). If scan tool communicates, system is okay at this time. If scan tool does not communicate, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 SERIAL DATA LINE or SCAN TOOL DOES NOT COMMUNICATE WITH UART DATA LINE under SYSTEM TESTS.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.