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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. Using scan tool, check if Diagnostic Trouble Code (DTC) P0335 is present. If DTC P0335 is present, diagnose DTC. See appropriate SELF-DIAGNOSTICS article. If DTC P0335 is not present, go to next step.
  3. Using scan tool, observe ENGINE SPEED parameter while cranking engine. If scan tool displays a steady value of 200-300 RPM, go to step  5. If scan tool does not display specified value, go to next step.
  4. Check Crankshaft Position (CKP) sensor ignition reference low circuit for a short to ground. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  30. If circuit is okay, go to step  29.
  5. Turn ignition on with engine off. Using scan tool, check data parameters on Engine Coolant Temperature (ECT) sensor, Throttle Position (TP) sensor and Manifold Absolute Pressure (MAP) sensor. Locate fault for any sensor reading not within expected values. Repair as necessary. After repairs, go to step  30. If sensor values are okay, go to next step.
  6. Disconnect fuel injector harness connectors. 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 next step. If no spark or a weak spark is present, go to step  13.
  7. Turn ignition off. Install Fuel Pressure Gauge (J-34730-1A). Cycle ignition on and off several times to obtain maximum fuel pressure. Turn ignition on with engine off. Fuel pump should operate for about 2 seconds. Observe fuel pressure with fuel pump running. Fuel pressure should be 39-44 psi (2.7-3.1 kg/cm2 ). If fuel pressure is as specified, go to step  9. If fuel pressure is not as specified, go to next step.
  8. Turn ignition on with engine off. Fuel pump should operate for about 2 seconds. Observe fuel pressure. If fuel pressure is greater than one psi (.07 kg/cm2 ), diagnose fuel system. See BASIC FUEL SYSTEM CHECKS . If fuel pressure is less than one psi (.07 kg/cm2 ), go to FUEL SYSTEM ELECTRICAL CIRCUIT .
  9. Check for contaminated fuel. Repair as necessary. After repairs, go to step  30. If fuel is okay, go to next step.
  10. Check for fouled or incorrectly gapped spark plugs. Repair or replace as necessary. After repairs, go to step  30. If spark plugs are okay, go to next step.
  11. Turn ignition off. Disconnect all fuel injector harness connectors. Install Injector Test Light (J-34730-2B) onto each fuel injector harness connector. Observe injector test light while cranking engine for each injector. If injector test light flashes for each injector, go to next step. If injector test light does not flash for each injector, diagnose fuel injector circuit. See FUEL SYSTEM in appropriate SELF-DIAGNOSTICS article.
  12. Check for faulty fuel injectors. Replace as necessary. After repairs, go to step  30. If fuel injectors are okay, go to step  27.
  13. Using DVOM, measure resistance of each spark plug wire. If resistance is 1200-3000 ohms per foot, go to next step. If resistance is not as specified, go to step  26.
  14. Check spark plug wires and ignition coil towers for corrosion, cracks, carbon tracking or water contamination. Repair as necessary. After repairs, go to step  30. If spark plug wires and ignition coil towers are okay, go to next step.
  15. Disconnect both spark plug wires from ignition coil supplying cylinders with no spark. Using DVOM, measure resistance of secondary coil winding. If resistance is 8500-11,500 ohms at 68°F (20°C), go to next step. If resistance is not as specified, go to step  28.
  16. Disconnect harness connector from ignition coil supplying cylinders with no spark. Turn ignition on with engine off. Connect a test light between ignition coil ignition feed circuit (harness side) and ground. See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  21.
  17. Using a test light connected to battery positive, probe ignition coil ground circuit (harness side). See appropriate wiring diagram in WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step  20.
  18. Turn ignition off. Connect DVOM to ignition coil ignition control circuit (harness side). See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on with engine off. Measure voltage. If voltage is 24-35 millivolts, go to next step. If voltage is not as specified, go to step  22.
  19. Observe DVOM while cranking engine. If voltage is 0.9-1.5 volts, go to step  25. If voltage is not as specified, go to step  24.
  20. Repair open or faulty connection in ignition coil ground circuit. After repairs, go to step  30.
  21. Repair open in ignition coil ignition feed circuit. After repairs, go to step  30.
  22. Check for an open or short in ignition control circuit. Repair as necessary. After repairs, go to step  30. If circuit is okay, go to next step.
  23. Check for faulty harness connection at PCM. Repair as necessary. After repairs, go to step  30. If connection is okay, go to next step.
  24. Replace PCM. After repairs, go to step  30.
  25. Check for faulty harness connection at ignition coil. Repair as necessary. After repairs, go to step  30. If connection is okay, go to next step.
  26. Replace faulty ignition coil. After repairs, go to step  30.
  27. Check for the following engine mechanical problems:
    • Worn or faulty camshaft.
    • Leaking or sticking valves.
    • Leaking or sticking piston rings.
    • Excessive valve deposits.
    • Collapsed or sticking lifters.
    • Loose or worn rocker arms.
    • Weak valve springs.
    • Incorrect valve timing.
    • Leaking head gasket.

    Repair as necessary. After repairs, go to step  30. If no problem is found, go to DIAGNOSTIC AIDS .

  28. Replace any faulty spark plug wires. After repairs, go to step  30.
  29. Replace CKP sensor. After repairs, go to next step.
  30. Start engine and observe MIL. If MIL illuminates for about 1-2 seconds and then turns off, system is okay. If MIL does not illuminate or illuminates and does not turn off, see appropriate SELF-DIAGNOSTICS article.
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