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Ignition System

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
  2. Check for power to IGN fuse and FI fuse. Check fuses for an open condition or poor terminal contact. Repair as necessary. After repairs, go to step  20. If no problem is found, go to next step.
  3. Using scan tool, check for Diagnostic Trouble Codes (DTCs). If DTC P0335 or P0340 is present, go to appropriate DTC test. See appropriate SELF-DIAGNOSTICS article. If DTC P0335 or P0340 is not present, go to next step.
  4. If DTC P1300 or P1310 is present, go to appropriate DTC test. See appropriate SELF-DIAGNOSTICS article. If DTC P1300 or P1310 is not present, go to next step.
  5. Turn ignition on with engine off. Using scan tool, monitor ECT sensor parameter. If ECT value displayed on scan tool is near actual coolant temperature, go to next step. If value displayed is not near actual coolant temperature, go to DTC P0115. See appropriate SELF-DIAGNOSTICS article.
  6. Using scan tool, monitor TP sensor parameter with throttle closed. If TP value displayed on scan tool is 0-23 percent, go to next step. If value displayed is not as specified, go to DTC P0121. See appropriate SELF-DIAGNOSTICS article.
  7. Using scan tool, monitor MAP sensor kPa reading. Compare MAP kPa reading with that of kPa reading from a known-good vehicle. If kPa reading from both vehicle is within 2 kPa of each other, go to next step. If kPa readings are not as specified, go to DTC P0106. See appropriate SELF-DIAGNOSTICS article.
  8. Turn ignition off. Disconnect all fuel injector harness connectors. Connect fuel injector test light to each fuel injector harness connector and crank engine. If test light flashes for each fuel injector, go to next step. If test light does not flash for each fuel injector, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
  9. Install Spark Tester (J-26792) on No. 1 spark plug wire. Check for spark at spark plug wire while cranking engine. Repeat spark test on all spark plug wires. If a strong, Blue spark is present at each spark plug wire, go to step  11. If no spark or weak spark is present, go to next step.
  10. Remove ignition wires. Check for carbon tracking and damaged boots or insulation. Using DVOM, measure resistance at each ignition wire. If resistance is greater than 25,000 ohms or any damage is found, go to step  18. If resistance is 25,000 ohms or less and condition of wires are okay, go to step  17.
  11. Remove spark plugs. Check for damage or fouled condition. Replace as necessary. After repairs, go to step  19. If spark plugs are okay, go to next step.
  12. Ensure vehicle has an adequate supply of fuel in fuel tank. Install fuel pressure gauge. Crank engine and observe fuel pressure gauge. If any pressure is indicated while cranking engine, go to next step. If no pressure is indicated, go to FUEL SYSTEM ELECTRICAL CIRCUIT .
  13. Install scan tool. Turn ignition on with engine off. Using scan tool, command fuel pump relay on for 5 seconds. Observe fuel pressure gauge. If fuel pressure is 44-50 psi (3.1-3.5 kg/cm2 ), go to next step. If fuel pressure is not as specified, diagnose fuel system. See BASIC FUEL SYSTEM CHECKS .
  14. Check fuel for alcohol or contamination. Replace fuel as necessary. After repairs, go to step  19. If fuel condition is okay, go to next step.
  15. Check condition of all chassis, engine and PCM ground circuit connections. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  19. If ground connections are okay, go to next step.
  16. Check for any of the following engine mechanical conditions:
    • Worn or faulty camshaft.
    • Leaking or sticking valves.
    • Excessive valve deposits.
    • Weak valve springs.
    • Incorrect valve timing.
    • Vacuum leaks.
    • Broken or leaking piston rings.
    • Leaking head gasket.

    Repair as necessary. After repairs, go to step  19. If no engine mechanical problems are found, go to DIAGNOSTIC AIDS .

  17. Replace ignition coil associated with cylinder which produced no spark. After repairs, go to step  19.
  18. Replace faulty spark plug wires. After repairs, go to next step.
  19. Using scan tool, clear DTCs. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start, or starts and stalls, go to step  2.
  20. Allow engine to reach normal operating temperature. Using scan tool, check for DTCs. If DTCs are present, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If DTCs are not present, system is okay.
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