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Home >> Isuzu >> 1998 >> Trooper S, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Trouble Shooting - Amigo, Rodeo & Passport 2.2L >> Engine Cranks But Will Not Run

Engine Cranks But Will Not Run

WARNING: Relieve fuel pressure before connecting fuel pressure gauge. See FUEL SYSTEM PRESSURE RELEASE  under FUEL SYSTEM.
  1. Perform On-Board Diagnostic II (OBD-II) System Check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in TESTS W/CODES - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Install Tech 2 scan tool. Following manufacturer's instructions, check for stored DTCs. If no DTCs are stored, go to next step. If any DTCs are stored, diagnose DTC. See appropriate TESTS W/CODES - INTRODUCTION articles below:
    • For SLX, Amigo, Rodeo, Trooper and Passport 2.2L, see TESTS W/CODES article.
    • For Hombre 2.2L, see TESTS W/CODES article.
    • For SLX, Amigo, Rodeo, Trooper and Passport 3.2L and 3.5L, see TESTS W/CODES article.
  3. Check IGNITION COIL fuse (15-amp) and ENGINE DEVICE fuse (15-amp) located in dash fuse box. Check PCM fuse (15-amp) located in fuse/relay box in engine compartment. If any fuse is blown, go to next step. If fuses are okay, go to step 5).
  4. Check for short to ground in appropriate circuits. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. Replace any blown fuses.
  5. Turn ignition on. With a test light connected to ground, probe IGNITION COIL fuse (15-amp) and ENGINE DEVICE fuse (15-amp) located in dash fuse box and PCM fuse (15-amp) located in fuse/relay box in engine compartment. If test light illuminates at all fuses, go to step 7). If test light does not illuminate at all fuses, go to next step.
  6. Repair open in appropriate ignition feed circuit. Retest system.
  7. Disconnect ignition secondary wire at coil No. 1. Install spark tester at end of secondary wire. While cranking engine, check for crisp, Blue spark. If poor or no spark is found, go to next step. If spark is okay, go to step 16).
  8. Disconnect ignition module harness connector. Check for open or short in Red/Black wire between ignition coil and Ignition Control Module (ICM). If Red/Black wire is okay, go to step 10). If problem is found in Red/Black wire, go to next step.
  9. Repair open or short in Red/Black wire as necessary. Retest system.
  10. Turn ignition on. Using DVOM, measure voltage at Black/Orange wire terminal of ICM harness connector. If battery voltage exists, go to step 12). If battery voltage does not exist, go to next step.
  11. Repair open in Black/Orange wire. Retest system.
  12. Check for open in ICM ground circuit (Black/Red wire). If problem is found, go to next step. If no problem is found, go to step 14)
  13. Locate and repair open in Black/Red wire. Retest system.
  14. Replace ICM. Attempt to start engine. If engine does not start, go to next step.
  15. Replace PCM. Program PCM as required. Retest system.
  16. Turn ignition off. Using DVOM, measure ignition coil primary resistance. If primary resistance is .8-18 ohms, go to next step. If resistance is not as specified, go to step 18).
  17. Measure ignition coil secondary resistance. If secondary resistance is 9000-12,000 ohms, go to step 19). If secondary resistance is not as specified, go to next step.
  18. Replace ignition coil. Retest system.
  19. Measure resistance of each coil-to-spark plug secondary ignition wire. If resistance is greater than 10 k/ohms per foot, go to next step. If resistance is not greater than specification, go to step 21),
  20. Replace any spark plug wires with resistance greater than 10 k/ohms per foot. Verify engine operation. If problem still exists, go to next step.
  21. Remove all spark plugs. Inspect spark plugs for fouling, loose or missing electrodes, or cracked plugs. Clean or replace spark plugs as necessary and go to next step. If spark plugs are okay, go to step 33).
  22. Attempt to start engine. If problem still exists, go to next step.
  23. Turn ignition off. Install fuel pressure gauge to fuel supply line test fitting. Turn ignition on. If fuel pressure is 43-55 psi (2.9-3.9 kg/cm2 ) and holds steady, go to step 24). If fuel pressure is not 43-55 psi (2.9-3.9 kg/cm2 ) or does not hold steady, go to next step.
  24. If no fuel pressure is indicated, go to FUEL SYSTEM DIAGNOSIS  . If any fuel pressure is indicated, go to FUEL SYSTEM ELECTRICAL TEST  .
  25. Install Injector Tester (J-39021 ) and switch box at injector test connector, and activate fuel injector. If fuel pressure drops, go to next step. If fuel pressure does not drop, go to FUEL SYSTEM DIAGNOSIS  .
  26. Pressurize system with ignition on. Using injector switch box, test each injector for pressure drop. If a pressure drop exists for each injector, go to next step. If a pressure drop does not exist for each injector, go to FUEL SYSTEM DIAGNOSIS  .
  27. Remove Injector Tester (J-39021 ) and switch box. Connector Injector Test Light (J-39021-45 ) to injector test harness connector. Crank engine. If any tester lights blink while engine is cranking, go to step 33). If no tester lights blink while engine is cranking, go to next step.
  28. Raise and support vehicle. Disconnect Crankshaft Position (CKP) sensor connector. Turn ignition on. Using a test light connected to ground, probe ignition feed circuit at CKP sensor harness terminal No. 1 (Green wire). If test light does not illuminate, repair open Green wire. Retest system. If test light illuminates, go to next step.
  29. Connect test light between ignition feed circuit at CKP sensor harness terminal No. 1 (Green wire) and ground circuit terminal No. 3 (Black wire). If test light does not illuminate, repair open Black wire. Retest system. If test light illuminates, go to next step.
  30. Turn ignition off. Check signal circuit of CKP sensor between CKP sensor and ECM for open or short. If problem is found in CKP signal circuit, repair open or short as necessary. Retest system. If CKP signal circuit is okay, go to step 33).
  31. Replace CKP sensor. Retest system. If problem still exists, go to step 34).
  32. Check for open or short in CKP low circuit (Blue wire) between CKP sensor terminal No. 2 and PCM. If no problem was found, go to next step. If problem was found, repair Blue wire as necessary.
  33. Replace PCM. Program PCM. Retest system.
  34. Test for fuel contamination. If fuel is not contaminated, go to next step. If fuel is contaminated, clean fuel system as necessary. Replace fuel filter and verify all fuel injectors are delivering fuel.
  35. Check for these possible conditions:
    • Faulty or incorrect camshaft timing belt.
    • Leaking or sticking valves or rings.
    • Leaking head gasket.
    • Excessive valve deposits.
    • Loose or worn rocker arms.
    • Weak valve springs.

    Repair as necessary. See appropriate article in ENGINES section. Retest system.

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