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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 (6.5L Diesel) >> Diagnostic Procedure

Diagnostic Procedure

    NOTE: Before clearing DTCs use Scan Tool Capture Info to record Freeze Frame/Failure Records for reference, as data will be lost when Clear Info function is used.
  1. Perform OBD system check. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 6.5L CAB & CHASSIS, CHEVY EXPRESS & SAVANA article. After performing OBD system check, go to next step.
  2. Check battery condition. If batteries are okay, go to next step. If condition of batteries is not okay, go to step  22.
  3. Check fuel level in tank. If fuel level is okay, go to next step. If fuel level is not okay, go to step  22.
  4. Check quality of fuel. If fuel quality is okay, go to next step. If fuel quality is not okay, go to step  22.
  5. Check glow plug system operation. Go to GLOW PLUG SYSTEM DIAGNOSIS under FUEL SYSTEM (DIESEL) in SYSTEM & COMPONENT TESTING - TRUCKS - EXCEPT TRACKER article. If glow plug operation is okay, go to next step. If glow plug operation is not okay, go to step  22.
  6. Check for proper engine cranking speed. See DIAGNOSTIC AIDS . If engine cranking speed is okay, go to next step. If engine cranking speed is not okay, go to step  22.
  7. Check fuel supply system. Go to FUEL SYSTEM DIAGNOSIS (6.5L) under FUEL SYSTEM (DIESEL) in SYSTEM & COMPONENT TESTING - TRUCKS - EXCEPT TRACKER article. If fuel system is okay, go to next step. If fuel system is not okay, go to step  22.
  8. Check injection pump ground wire located on top of injection pump. If ground wire is okay, go to next step. If ground wire is not okay, go to step  22.
  9. Install scan tool. Using scan tool, check for any data. If data is displayed, go to next step. If data is not displayed, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in APPROPRIATE BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  10. Using scan tool, monitor VTD Fuel Disabled parameter on Powertrain Engine Data 1 list. Crank engine. If VTD Fuel Disabled parameter displays ACTIVE while engine is cranked, diagnose VTD system. See appropriate ANTI-THEFT SYSTEMS article in ACCESSORIES & EQUIPMENT. If VTD Fuel Disabled parameter does not display ACTIVE, go to next step.
  11. Loosen injector line at injector. Crank engine and check for fuel. Repeat procedure for all injectors. If fuel flows from each injection line, injection system is okay. If fuel does not flow from each injection line, go to next step.
  12. Disconnect optical/fuel temperature sensor. Attempt to start engine. If engine starts, go to step  16. If engine does not start, go to next step.
  13. Reconnect optical/fuel temperature sensor. Disconnect fuel solenoid driver at fuel injection pump 4-pin connector. Using DVOM, measure voltage between ground and fuel injector control circuit at harness connector while cranking engine. If voltage is 1.2 volts or more, go to next step. If voltage is less than 1.2 volts, go to step  17.
  14. With fuel solenoid driver 4-pin connector still disconnected, probe solenoid closure ground circuit at harness connector with test light connected to battery voltage. If test light illuminates, go to next step. If test light does not illuminate, go to step  18.
  15. Turn ignition on. Ensure fuel solenoid driver 4-pin connector is still disconnected. Using test light connected to ground, probe ignition feed circuit at fuel solenoid harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  20.
  16. Replace fuel injection pump. After repairs, go to step  24.
  17. Check for open or short to ground in fuel injection control circuit between fuel solenoid driver and PCM. Repair as necessary. After repairs, go to step  21. If circuit is okay, go to step  19.
  18. Check closure signal ground circuit for open between fuel solenoid driver and PCM. Repair as necessary. After repairs, go to step  21. If circuit is okay, go to next step.
  19. Check for poor connections at fuel solenoid driver and PCM harness connectors. Repair as necessary. After repairs, go to step  21. If connections are okay, go to step  23.
  20. Repair open in Ignition 1 voltage circuit. After repairs, go to step  24.
  21. Repair circuit as necessary. After repairs, go to step  24.
  22. Repair as necessary. After repairs, go to step  24.
  23. Replace PCM. Perform PCM relearn procedures. See PROGRAMMING in SELF-DIAGNOSTICS - 6.5L CAB & CHASSIS, CHEVY EXPRESS & SAVANA article. After repairs, go to next step.
  24. Using scan tool, select DTC, Clear Info. function. 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.
  25. Using scan tool, select Capture Info, Review Info function. If any other DTCs are set that have not been diagnosed, diagnose DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 6.5L CAB & CHASSIS, CHEVY EXPRESS & SAVANA article. If DTCs are not set, system is okay.
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