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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Basic Diagnostic Procedures >> No Start Diagnosis >> No Start - Engine Cranks Okay (3.5L) >> General Inspection

General Inspection

  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. Turn ignition on. If MIL is illuminated, go to next step. If MIL is not illuminated, go to step  12 .
  3. Using scan tool, check for DTCs. If DTCs are set, diagnose DTCs first. See appropriate SELF-DIAGNOSTICS article. If no DTCs are set, go to next step.
    4. NOTE: Ensure ignition feed circuits to and from IGN MAIN relay are okay.
  4. Check F/INJR fuse (15-amp) and INJR fuse (15-amp) located in underhood accessory wiring junction block. If either fuse is open, go to step  13 . If both fuses are okay, go to next step.
  5. Using scan tool, check engine coolant temperature. If scan tool reading is close to actual engine coolant temperature, go to next step. If scan tool reading is not close to actual engine coolant temperature, go to step  10 .
  6. Using scan tool, check TP sensor angle with throttle closed. If TP sensor angle is greater than 2 percent, go to step  11 . If TP sensor angle is not greater than 2 percent, go to next step.
  7. Turn ignition off. Wait 15 seconds. Turn ignition on. Fuel pump should run for about 2 seconds. If fuel pump runs, go to next step. If fuel pump does not run, see FUEL PUMP ELECTRICAL CIRCUIT  .
  8. Turn ignition off. Connect fuel pressure gauge. See BASIC FUEL SYSTEM CHECKS  . Check fuel pressure. If fuel pressure is within specification, go to next step. If fuel pressure is not within specification, diagnose fuel system. See FUEL SYSTEM in appropriate SYSTEM & COMPONENT TESTING article.
  9. Check for fouled spark plugs. Check for air leaks in air intake system. Repair as necessary. If MAF sensor is at fault, disconnecting MAF sensor will cause PCM to default to calculated airflow. If engine starts with sensor disconnected, replace MAF sensor. After repairs, go to step  14 . If no problem is found, check for intermittent problem. See appropriate TROUBLE SHOOTING - NO CODES article.
  10. ECT sensor is faulty (shifted). With a completely cool engine, ECT and IAT sensor values should be within a few degrees of each other. Replace ECT sensor. After repairs, go to step  14 .
  11. Check for out-of-range TP sensor. TP sensor value should be near zero percent at closed throttle, and near 100 percent at WOT. TP sensor value should increase smoothly as throttle is opened. Check for poor sensor harness connections and binding linkage. For additional information, refer to diagnostic procedure for DTC P0121. See appropriate SELF-DIAGNOSTICS article. Repair as necessary. After repairs, go to step  14 .
  12. Repair ignition 1 power circuit to PCM. After repairs, go to step  14 .
  13. Repair short to ground in circuit with open fuse. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Attempt to start engine. If engine starts, go to next step. If engine does not start, check for engine mechanical problems. Repair as necessary.
  15. Allow engine to reach normal operating temperature. Using scan tool, check for DTCs. If any DTCs are set, diagnose DTCs. See appropriate SELF-DIAGNOSTICS article. If no DTCs are set, system is okay.
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