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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Basic Diagnostic Procedures >> No-Start Diagnosis >> No-Start - Engine Cranks Okay (2.2L VUE) >> Diagnostic Procedures

Diagnostic Procedures

  1. Ensure engine is cranking at normal cranking speed and there is sufficient fuel in fuel tank. Turn ignition on, with engine off. Using scan tool, verify that communications can be established with the BCM and ECM. If scan tool can communicate with BCM and ECM, go to next step. If scan tool does not communicate with BCM and ECM, perform Serial Data Check in Data Link Communication section in the BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Are any BCM and ECM PassLock® security system or communication DTCs set (P1630, P1632 or "U" type DTCs)? If yes, diagnose affected DTC(s). See SELF-DIAGNOSTICS - 2.2L SATURN VUE article. If no, go to next step.
  3. Using scan tool, monitor IGNITION 1 voltage in the ECM General Info - Input table. If scan tool reads less than 2 volts, go to step  6. If scan tool reads more than 2 volts, go to next step.
  4. Turn ignition off. Check IGN 1/2 fuse located in underhood fuse/relay block. Replace and retest if fuse is open. Check POWERTRAIN fuse in underhood fuse/relay block. Replace and retest if fuse is open. If affected fuse continues to open, check for short to ground in circuit. If fuses are okay, disconnect ECM harness connector J1. Turn ignition on. Using a DVOM, check voltage between ground and ECM harness connector terminal No. 19 (Pink wire). If ignition voltage is present, go to next step. If ignition voltage is not present, circuit is open. Repair as necessary.
  5. Check ground splice for tightness. Check ECM harness connectors for terminal tightness. Repair as necessary. If ground splice and ECM harness connector terminals are okay, replace ECM.
  6. Check if any internal ECM DTCs are set. If DTCs are set, diagnose affected DTC(s). See SELF-DIAGNOSTICS - 2.2L SATURN VUE article. If no DTCs are set, go to next step.
  7. Using scan tool, monitor CKP ACTIVE COUNTER while cranking engine. If counter increments while cranking engine, go to next step. If counter does not increment while cranking engine, diagnose RPM signal loss. See Crankshaft Position (CKP) sensor diagnosis in SYSTEM & COMPONENT TESTING - TRUCKS article.
  8. Using scan tool, monitor CALC COMPRESSION OUTPUT while cranking engine. Is pattern 00000100 or 00001001 displayed on scan tool? If yes, go to next step. If no, diagnose fuel delivery system. See FUEL SYSTEMS (GASOLINE) in SYSTEM & COMPONENT TESTING - TRUCKS - EXCEPT TRACKER article.
  9. Turn ignition off. Check ING/INJ fuse in underhood fuse/relay block. Replace and retest as necessary. If fuse continues to open when engine is cranked, check for short to ground in circuit. If fuse is okay, disconnect cylinder No. 4 fuel injector harness connector. Connect a Noid Light (J-34730-405) to fuel injector harness connector. Crank engine. If noid light pulses, diagnose fuel delivery system. See BASIC FUEL SYSTEM CHECKS (GASOLINE) . If noid light does not pulse, repair open in injector circuit.
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