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Home >> Chevrolet >> 2000 >> Tracker 4D Utility, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0301-P0304: Cylinder Misfire Detected >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Install scan tool. Start engine. Check for DTCs. If DTCs P0301, P0302, P0303 or P0304 is not present at idle, go to next step. If DTC P0301, P0302, P0303 or P0304 is present at idle, go to step  4.
  3. Turn ignition on, with engine off. Using scan tool, clear DTCs. Operate vehicle within FREEZE FRAME conditions. Retrieve DTCs. If DTC P0301, P0302, P0303 or P0304 resets, go to next step. If DTC P0301, P0302, P0303 or P0304 does not reset, see DIAGNOSTIC AIDS .
  4. Visually and physically check the following items:
    • Improperly operating or leaking PCV valve.
    • Incorrect PCV valve.
    • Vacuum leak at intake manifold or gasket.
    • Vacuum leak at a cracked, split or worn vacuum hose.

    Repair as necessary. After repairs, go to step  17. If no problem(s) exists, go to next step.

  5. Disconnect fuel injector harness connectors. Remove No. 1 ignition coil. Install a spark tester to No. 1 ignition coil spark plug boot. Crank engine while observing spark tester. Repeat procedure for all ignition coils. If any ignition coil indicates a weak spark, go to next step. If spark is okay on all ignition coils, go to step  10.
  6. Remove affected ignition wire. Visually and physically inspect ignition wire for carbon tracking, insulation damage or corroded terminals. Repair as necessary. After repairs, go to step  17. If ignition wire(s) are okay, go to next step.
  7. Check ignition wire resistance. Resistance should be 1200-3000 ohsm/feet. Replace ignition wire(s) as necessary. After replacing ignition wire(s), go to step  17. If ignition wire(s) are okay, go to next step.
  8. Check affected ignition coil for cracks, moisture, faulty electrical connections, carbon tracking or corrosion. Repair or replace as necessary. After repairs, go to step  17. If no problems were foound, go to next step.
  9. Replace faulty ignition coil. After replacing ignition coil, go to step  17.
  10. Remove spark plugs. Inspect spark plugs for damage (fouled, cracked, gap, carbon tracking, etc.). Replace as necessary. After repairs, go to step  13. If spark plugs are okay, go to next step.
  11. Turn ignition off. Disconnect fuel injector harness connectors. Connect fuel injector test light to each injector harness connector, one at a time. Observe test light while cranking engine. If test light flashes at each injector, go to next step. If test light did not flash at each injector, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate BASIC DIAGNOSTIC PROCEDURES article.
  12. Check fuel injectors for proper operation. Perform fuel injector coil test and balance test. See FUEL SYSTEM in appropriate BASIC DIAGNOSTIC PROCEDURES article. If a fuel injector is faulty, replace as necessary and go to step  17. If fuel injectors are okay, go to step  14.
  13. If a spark plug is replaced because of fuel, oil or coolant fouling, go to next step. If a spark plug is not replaced because of fuel, oil or coolant fouling, go to step  17.
  14. Check engine for the following mechanical problems:
    • Worn or faulty camshaft.
    • Leaky or sticky valves.
    • Excessive valve deposits.
    • Broken or leaky piston rings.
    • Weak valve springs.
    • Incorrect valve timing.
    • Intake (vacuum) leaks.
    • Leaking head gasket.
    • Loose or broken motor mounts.
    Repair as necessary. After repairs, go to step  17. If no problem exists, go to next step.
  15. Remove CMP sensor. Inspect CMP sensor for damage, foreign material on sensor (magnet) surface, and water or corrosion at connector terminals. Repair as necessary. After repairs, go to next step. If CMP sensor is okay, see DIAGNOSTIC AIDS .
  16. Inspect CMP sensor signal rotor in CMP sensor housing for damaged teeth, foreign material, and correct installation. Repair as necessary. After repairs, go to step  18. If CMP sensor signal rotor is okay, see DIAGNOSTIC AIDS .
  17. After repairs, clear DTCs. Operate vehicle within FREEZE FRAME conditions that set DTC. Check for DTCs. If no DTCs are stored, repair is complete. If any DTCs are stored, diagnose DTC(s).
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