2001 Chevrolet Cavalier LS, 2.4 TFACTORY OEM SERVICE PROCEDURE

General Inspection

  1. If powertrain diagnostic system check has already been performed, go to next step. If powertrain diagnostic system check has not been performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
  2. Check all fuses in power distribution center located next to battery, and FUEL PUMP fuse (20-amp) located in instrument panel fuse block. If any fuses are open, go to step  12. If all fuses are okay, go to next step.
  3. Check ECM ground circuit and ground circuit from battery to body for loose connections, corrosion, high resistance or opens. Repair as necessary. After repairs, go to step  13. If circuits are okay, go to next step.
  4. Using scan tool, check for DTCs that may cause a no-start condition (theft deterrent, powertrain, engine electrical, etc.). Repair as necessary. If no DTCs are present, go to next step.
  5. Using scan tool, monitor theft deterrent status. If status reads CORRECT CODE, go to next step. If status does not read CORRECT CODE, perform SYSTEM OPERATION CHECK. See appropriate DOOR LOCKS & ANTI-THEFT SYSTEMS article.
  6. Using scan tool, review data list for MAF, TP, APP, ECT and IAT sensors. Compare sensor values to known-good values. If sensor values are normal, go to next step. If sensor values are not normal, diagnose using appropriate DTC diagnostic procedure applicable to faulty sensor. See appropriate SELF-DIAGNOSTICS article.
  7. Turn ignition on. Using scan tool, command fuel pump on. If fuel pump runs, go to next step. If fuel pump does not run, see FUEL PUMP ELECTRICAL CIRCUIT .
  8. Turn ignition off. Install fuel pressure gauge. See BASIC FUEL SYSTEM CHECKS . Using scan tool, command fuel pump on. If pressure is 40-46 psi (2.8-3.2 kg/cm2 ), go to next step. If pressure is not as specified, diagnose fuel system. See FUEL SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
  9. Check ignition system. See IGNITION CIRCUIT . Repair as necessary. After repairs, go to step  13. If ignition system is okay, go to next step.
  10. Check for air leaks in air duct between MAF sensor and throttle body. Check MAF sensor operation by disconnecting sensor and operating engine. If disconnecting sensor corrects no-start condition, replace MAF sensor. After repairs, go to step  13. If no problem is found, go to next step.
  11. Check for fouled spark plugs and cause. Check for contaminated fuel, restricted exhaust system or engine mechanical problem. Repair as necessary. After repairs, go to step  13. If no problem is found, check for intermittent problem. See appropriate TROUBLE SHOOTING - NO CODES article.
  12. Repair affected fuse related circuit for short to ground. After repairs, go to next step.
  13. Using scan tool, clear DTCs. Attempt to start engine. If engine starts, go to next step. If engine does not start, go to step  2.
  14. Allow engine to idle and reach normal operating temperature. Using scan tool, check for DTCs. If DTCs are set, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If no DTCs are set, system is okay.
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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.

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