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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. Turn ignition on. Using scan tool, check for Diagnostic Trouble Codes (DTCs). If DTC P0100, P0230, P0335, P0560, P0601, P0602, P0604, P1460, P1501, P1502 or P1503 is present, diagnose DTCs first. See appropriate SELF-DIAGNOSTICS article. If DTCs are not present, go to next step.
  3. Using scan tool, check engine coolant temperature. Engine coolant temperature reading on scan tool should be close to actual engine temperature. If coolant temperature reading is as specified, go to next step. If scanned coolant temperature is not close to actual engine temperature reading, go to DTC P0115. See appropriate SELF-DIAGNOSTICS article.
  4. Using scan tool, check TP NORMALIZED. If TP NORMALIZED is greater than 15 percent, go to DTC P1221. See appropriate SELF-DIAGNOSTICS article. If TP NORMALIZED is not greater than 15 percent, go to next step.
  5. Using Spark Tester (J-26792), check for spark at either wire on each coil while cranking engine. If spark is present at each coil, go to next step. If spark is not present at one or more coils, diagnose ignition system. See BASIC IGNITION SYSTEM CHECKS  .
  6. Disconnect main injector harness connector at rear of intake manifold. Check for poor terminal connection. Repair as necessary. After repairs, go to step  14 . If harness connector is okay, go to next step.
  7. Using a test light connected to ground, probe main injector harness connector (ECM side) switched battery voltage circuit. 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  12 .
  8. Using a fused jumper wire, connect switched battery voltage circuit of main injector harness connectors together. Using a test light connected to ground, probe main injector harness connector (injector side) injector control circuit. 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  13 .
  9. Crank engine for about 2 seconds, and then release key without turning ignition off. Fuel pump should operate and continue operating for about 2 seconds after engine stops cranking. If fuel pump operates as specified, go to next step. If fuel pump does not operate as specified, go to FUEL SYSTEM ELECTRICAL CIRCUIT  .
  10. Turn ignition off. Install fuel pressure gauge. Turn ignition on with engine off, for 5 seconds. Fuel pressure should be 46-59 psi (3.2-4.1 kg/cm2 ). If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to FUEL SYSTEM ELECTRICAL CIRCUIT  .
  11. Check for fouled spark plugs. Check for leak in air duct between Mass Airflow (MAF) sensor and throttle body. Check for faulty MAF sensor. To check MAF sensor, disconnect MAF sensor, and then attempt to start engine. If engine starts and idles, MAF sensor is faulty. After repairs, go to step  14 . If spark plugs, air duct and MAF sensor are okay, see appropriate SELF-DIAGNOSTICS article.
  12. Repair open or high resistance in main injector harness connector switched battery voltage circuit. After repairs, go to step  14 .
  13. Repair main injector harness. After repairs, go to next step.
  14. 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 .
  15. Allow engine to reach normal operating temperature. Using scan tool, check for DTCs. If any DTCs are present, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If DTCs are not present, go to next step.
  16. If any additional DTCs are present during On-Board Diagnostic (OBD) System Check, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If DTCs are not present, system is okay.
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