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Engine Cranks But Will Not Run: VehiCROSS

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 Isuzu VehiCROSS, 2000 Isuzu Trooper, 2000 Isuzu Rodeo, 2000 Isuzu Hombre, and 2000 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.
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 SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Check C-2 IGNITION COIL (15-amp) and C-3 ENGINE (15-amp) fuses in underdash fuse/relay block. Check PCM (40-amp) fuse in underhood fuse/relay block. If any fuse is blown, go to next step. If fuses are okay, go to step  4.
  3. Check for short to ground in appropriate circuits. See appropriate wiring diagram in ENGINE PERFORMANCE WIRING DIAGRAMS article. Repair as necessary. Replace any blown fuses.
  4. Turn ignition off. Relieve fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE  under FUEL SYSTEM. Install fuel pressure gauge to fuel supply line test fitting. Turn ignition on. If fuel pressure is 43-55 psi (3.0-3.9 kg/cm2 ) and holds steady, go to step  6. If fuel pressure is not 43-55 psi (3.0-3.9 kg/cm2 ) or does not hold steady, go to next step.
  5. If no fuel pressure is indicated, go to FUEL SYSTEM DIAGNOSIS  under FUEL SYSTEM. If any fuel pressure is indicated, go to FUEL SYSTEM ELECTRICAL TEST  under FUEL SYSTEM.
  6. Install Injector Tester (J 39021-2) at injector test connector. Activate fuel injector. If fuel pressure drops, go to next step. If fuel pressure does not drop, go to step  14.
  7. Install fuel injector test light at cylinder No. 2 injector harness connector. Crank engine. If test light blinks, go to next step. If test light does not blink, go to step  20.
  8. Disconnect 5-pin ignition coil module (ICM) connector. Turn ignition on. Using test light, verify module is being supplied with battery voltage and ground. If a problem is found, go to next step. If no problem is found, go to step  10.
  9. Repair open ignition feed circuit or ground circuit to ICM. Verify system is operating properly.
  10. Turn ignition on. Ensure all coil connectors are disconnected. Using a test light connected to ground, probe ignition feed circuit to each ignition coil connector Black/Orange wire. If test light does not illuminate at each terminal, go to next step. If test light does illuminate at each terminal, go to step  12.
  11. Repair open circuit in ignition feed Black/Orange wire. Verify system is operating properly.
  12. Ensure all coil connectors are disconnected. Using a test light connected to battery voltage, probe secondary ground circuit to each ignition coil connector Black wire. If test light does not illuminate at each terminal, go to next step. If test light does illuminate at each terminal, go to step  14.
  13. Repair open circuit in Black wire between appropriate ignition coil and ground. Verify system is operating properly.
  14. 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.
  15. Remove any ignition coil. Install spark tester at spark plug end of coil. While cranking engine, check ignition coil for crisp blue spark. If spark is okay, go to step  17. If weak spark or no spark exists, go to next step.
  16. Replace faulty ignition coil. Go to next step.
  17. Repeat test from step  15 for each ignition coil. Test one coil at a time, and reinstall each coil on its spark plug when testing is complete (DO NOT install screws). Start engine. If engine does not start, go to next step. If engine starts, install ignition coil screws and verify system is operating properly.
  18. Remove all spark plugs. Inspect spark plugs for fouling, loose or missing electrodes, or cracked plugs. Clean or replace spark plugs as necessary. If spark plugs are okay, go to next step.
  19. Check for these possible conditions:
    • Faulty or incorrect camshaft timing belt.
    • Leaking or sticking valves or rings.
    • Excessive valve deposits.
    • Loose or worn rocker arms.
    • Weak valve springs.
    • Incorrect valve timing.
    • Leaking head gasket.

    If problem is found, repair as necessary. See appropriate article in ENGINES. If no problem is found, go to step  21.

  20. Using Tech 2 scan tool, select ENGINE SPEED display. While cranking engine, observe scan tool. If RPM is indicated on scan tool, go to next step. If engine RPM is not indicated, go to step  30.
  21. Disconnect Gray 7-pin connector at rear of air cleaner (below where air duct attaches to MAF sensor). Turn ignition on. Using a test light connected to ground, probe ignition feed circuit at female side of connector (Red/Blue wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  28.
  22. Connect test light between PCM (female) side of Gray 7-pin connector Red/Blue wire and each specified terminal. See FUEL INJECTOR CONNECTOR WIRE COLOR IDENTIFICATION  table. Turn ignition on. If test light illuminates at any terminal, go to next step. If test light does not illuminate at any terminal, go to step  25.
    FUEL INJECTOR CONNECTOR WIRE COLOR IDENTIFICATION

    Application Wire Color
    Injector No. 1 Green/White
    Injector No. 2 Green/Orange
    Injector No. 3 Green
    Injector No. 4 Green/Red
    Injector No. 5 Green/Black
    Injector No. 6 Green/Yellow
  23. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step  29.
  24. Locate and repair short to ground in appropriate injector driver circuit. See FUEL INJECTOR CONNECTOR WIRE COLOR IDENTIFICATION  table.
  25. Connect test light between PCM (female) side of Gray 7-pin connector Red/Blue wire and each specified terminal. Crank engine. If test light flashes at all terminals, go to step  27. If test light does not flash at all terminals, go to next step.
  26. Check for open in appropriate injector driver circuit. See FUEL INJECTOR CONNECTOR WIRE COLOR IDENTIFICATION  table. Repair as necessary. If no problem was found, go to step  29.
  27. Turn ignition off. Connect ohmmeter between male side of Gray 7-pin connector Red/Blue wire and each specified pin. If resistance is about 12.5 ohms at all pins, go back to step  8. If resistance is not about 12.5 ohms at all pins, check for an open, shorted or faulty injector. Repair or replace as necessary.
  28. Repair Red/Blue wire(s) between PCM connector, PCM main relay (located in fuse/relay box in engine compartment) and Gray 7-pin connector. See appropriate wiring diagram in ENGINE PERFORMANCE WIRING DIAGRAMS article.
  29. Replace and reprogram PCM. See PROGRAMMING in SELF-DIAGNOSTICS - 3.2L & 3.5L article. Verify system is operating properly.
  30. 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 connector (Yellow/Red wire). If test light illuminates, go to step  32. If test light does not illuminate, go to next step.
  31. Repair open or short to ground in Yellow/Red wire between CKP sensor and PCM harness connector. See appropriate wiring diagram in ENGINE PERFORMANCE WIRING DIAGRAMS article.
  32. Turn ignition on. Connect test light between CKP sensor harness connector Yellow/Red and Green wires. If test light illuminates, go to step  34. If test light does not illuminate, go to next step.
  33. Repair open or short circuit to voltage in Green wire between CKP sensor and ground. If no problem was found, go to step  35.
  34. Check for open or short in signal circuit (Yellow wire) between CKP sensor and PCM harness connector. See appropriate wiring diagram in ENGINE PERFORMANCE WIRING DIAGRAMS article. Repair as necessary. If circuit is okay, go to next step.
  35. Replace CKP sensor. Verify system is operating properly. If problem is still present, go back to step  29.
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