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HOMESERVICE MANUALSSATURN2000LS AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - BASIC DIAGNOSTIC PROCEDURESNO START DIAGNOSISNO START - ENGINE CRANKS OKAY (2.2L - CAVALIER & SUNFIRE)IGNITION CIRCUIT
2000 Saturn LS Automatic

Ignition Circuit

2000 Saturn LS AutomaticSECTION Ignition Circuit
  1. Perform 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 for DTCs. If DTC P0601, P0602, P1621 or P1629 is present, diagnose DTCs first. See appropriate SELF-DIAGNOSTICS article. If DTCs are not present, go to next step.
  3. Crank engine. Using scan tool, monitor CKP activity counter. If counter increments, go to next step. If counter does not increment, go to step  9 .
  4. 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  .
  5. Turn ignition off. Install fuel pressure gauge. See BASIC FUEL SYSTEM CHECKS  . Turn ignition on. If fuel pressure is 52-58 psi (3.7-4.1 kg/cm2 ), go to next step. If fuel pressure is not as specified, diagnose fuel system. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
  6. Remove fuel pump relay. Install spark tester on plug wire for cylinder No. 1. Crank engine. Repeat for remaining cylinders. If spark is present for all cylinders, go to next step. If spark is not present for all cylinders, go to step  13 .
  7. Turn ignition off. Check for faulty spark plugs. Repair as necessary. After repairs, go to step  24 . If spark plugs are okay, go to next step.
  8. Check for basic engine mechanical problems. Repair as necessary. After repairs, go to step  24 . If no engine mechanical problems are found, see DIAGNOSTIC AIDS  .
  9. Turn ignition off. Disconnect ignition control module 2-pin harness connector. Turn ignition on. Measure voltage between harness connector terminals. If battery voltage is present, go to next step. If battery voltage is not present, go to step  19 .
  10. Disconnect ignition control module 6-pin harness connector. Measure resistance between CKP sensor signal circuit and CKP sensor ground circuit at 6-pin harness connector. If resistance is 700-1300 ohms, leave DVOM connected and go to next step. If resistance is not 700-1300 ohms, go to step  14 .
  11. Set DVOM to AC scale. Crank engine. If DVOM indicates more than 200 mV, go to next step. If DVOM does not indicate more than 200 mV, go to step  20 .
  12. Using test light connected to battery voltage, momentarily probe 7X reference signal circuit, and then reference low circuit at 6-pin harness connector. Monitor CKP activity counter on scan tool. If counter increments, go to step  15 . If counter does not increment, go to step  17 .
    13. CAUTION: Do not leave test light connected to PCM IC circuit for more than 5 seconds. Damage to ignition coil and/or ignition module may result.
  13. Turn ignition off. Disconnect PCM. Connect spark tester to spark plug wire with no spark. Turn ignition on. Using test light connected to battery voltage, momentarily probe affected ignition control circuit at PCM harness connector. If spark tester sparks, go to step  16 . If spark tester does not spark, go to step  18 .
  14. Check CKP sensor circuits for short to ground, short to power, faulty connections or opens. Repair as necessary. After repairs, go to step  24 . If circuits are okay, go to step  20 .
  15. Check for faulty connections at ignition control module. Repair as necessary. After repairs, go to step  24 . If connections are okay, go to step  21 .
  16. Check for faulty connections at PCM. Repair as necessary. After repairs, go to step  24 . If connections are okay, go to step  23 .
  17. Check 7X reference signal circuit for short to ground, short to power, open or faulty connection. Repair as necessary. After repairs, go to step  24 . If circuit is okay, go to step  23 .
  18. Check affected ignition control circuit for an open or short. Repair as necessary. After repairs, go to step  24 . If circuits are okay, go to step  22 .
  19. Repair open in ignition feed circuit or ground circuit to ignition control module.
  20. Replace CKP sensor. After repairs, go to step  24 .
  21. Replace ignition control module. After repairs, go to step  24 .
  22. Replace affected ignition coil. After repairs, go to step  24 .
  23. Replace PCM. Perform PCM relearn procedures. After repairs, go to next step.
  24. Attempt to start engine. If engine starts, perform OBD system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. If engine does not start, go to step  2 .
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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.