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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1537-U1193DTC P1652DTC P1652: PCM CHASSIS PITCH OUTPUT CIRCUIT (5.7L "Y" BODY)DIAGNOSTIC PROCEDURES
1999 Chevrolet Cavalier Z24, 2D Convertible, Automatic
Diagnostic Procedures
1999 Chevrolet Cavalier Z24, 2D Convertible, AutomaticSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
- Turn ignition off. Disconnect Electronic Suspension Control (ESC) module harness connector. Turn ignition on, with engine off. Using a test light connected to battery voltage, probe powertrain induced chassis pitch control circuit. If test light illuminates, go to step 4. If test light does not illuminate, go to next step.
- Using scan tool, command chassis pitch signal ON. If test light illuminates, repair Electronic Suspension System as necessary. See appropriate ELECTRONIC article in SUSPENSION. If test light does not illuminate, go to step 5.
- Check chassis pitch control circuit for short to ground. Repair as necessary. After repairs, go to step 8. If circuit is okay, go to step 7.
- Check chassis pitch control circuit for open. Repair as necessary. After repairs, go to step 8. If circuit is okay, go to next step.
- Check terminal connections at PCM. Repair terminals as necessary. After repairs, go to step 8. If terminals are okay, go to next step.
- Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
- Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2.
- Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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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.