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 P1273-P1536DTC P1371DTC P1371: IGNITION CONTROL (IC) MODULE 4X REFERENCE CIRCUIT TOO FEW PULSES (4.0L "G" BODY & 4.6L "E" & "K" BODIES)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.
- Using scan tool, check if DTC(s) P0322 or P1302 is also present. If DTCs are present, diagnose affected DTC(s) first. If DTCs are not present, go to next step.
- Check for possible sources of Electromagnetic Interference (EMI), such as spark wires routed too close to IC module, high power transmitter operating in the vicinity or a battery charger causing EMI. Correct problem, if present. If EMI is not present, go to next step.
- Clear DTC(s) and retest. If DTC P1371 resets, go to next step. If DTC does not reset, fault is not present. See DIAGNOSTIC AIDS .
- Check fuel control circuit terminal contact in IC module connector C4 and PCM harness connector C2. Check for possible open or short in fuel control signal circuit. Repair as necessary. If terminal contacts or circuits are okay, go to next step.
- Replace IC module.
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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.