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Home >> Saturn >> 2001 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Basic Diagnostic Procedures >> No-Start Diagnosis >> No Start - Engine Cranks Okay (3.0L - SATURN) >> ECM Input Circuits

ECM Input Circuits

  1. Ensure vehicle has adequate fuel. Connect scan tool. Attempt to start engine. If engine starts, go to step  7. If engine does not start, go to next step.
  2. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. Attempt to start engine. If engine RPM is detected, go to next step. If engine RPM is not detected, CKP sensor circuit is at fault. Diagnose using diagnostic procedure for DTC P0335. See appropriate SELF-DIAGNOSTICS article.
  3. If any injector, EGR solenoid, MAF, fuel pump relay or ECM internal DTCs are set, diagnose these DTCs first. See appropriate SELF-DIAGNOSTICS article. If no DTCs are set, go to next step.
  4. Connect fuel pressure gauge. See BASIC FUEL SYSTEM CHECKS . Cycle ignition switch. If pressure is 39-49 psi (2.7-3.4 kg/cm2 ), go to next step. If pressure is not as specified, see FUEL DELIVERY SYSTEM .
  5. Check IGN fuse (15-amp) located in underhood fuse block. Replace as necessary. Remove FUEL PUMP fuse (15-amp) located in underhood fuse block. Crank engine for 5 seconds. Using scan tool, run ignition coil test while listening for spark at appropriate coils. If spark is present at each cylinder, go to next step. If spark is not present at each cylinder, see IGNITION SYSTEM .
  6. Check for fouled spark plugs, restricted air intake, restricted exhaust or engine mechanical failure. Repair as necessary.
  7. Using scan tool, monitor engine misfire counter. If current misfire counters are counting up, diagnose using diagnostic procedures for specific or random DTCs. See appropriate SELF-DIAGNOSTICS article. If current misfire counters are not counting up, problem is intermittent. See appropriate TROUBLE SHOOTING - NO CODES article.
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