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Amigo/Rodeo 3.2L & Trooper 3.5L

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. On Amigo and Rodeo, check IG. COIL (15-amp) and ENGINE (15-amp) fuses located in dashboard fuse/relay block. Check ECM fuse (15-amp) located in underhood fuse/relay block in engine compartment. On Trooper, check IG. COIL (C-9, 15-amp) and ENGINE (C-8, 15-amp) fuses located in dashboard fuse/relay block. Check PCM fuse. 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. 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 and activate fuel injector. If fuel pressure drops, go to next step. If fuel pressure does not drop, go to step  18.
  7. Install fuel injector test light (noid light) at cylinder No. 2 injector harness connector. Turn ignition on and crank engine. If noid light blinks, go to next step. If light does not blink, go to step  24.
  8. Turn ignition off. Disconnect 11-pin harness connector from Ion Sensing Module (ISM) located on top of engine. Using a test light connected to battery voltage, probe each of the 6 exposed terminals while cranking engine. If test light flashes at each terminal, go to step  12. If test light does not flash at each terminal, go to next step.
    WARNING: Use gray narrow Metripak flexible female connector from J-35616 Connector Test Adaptor kit (or equivalent) to access terminals and prevent terminal and connector damage.
  9. Disconnect 4-pin ISM harness connector. Turn ignition on. Connect a test light between ground and 4-pin ICM harness connector Black/Orange wire (B+). Now connect test light between battery positive terminal and 4-pin ICM harness connector Black wire (ground). See ENGINE PERFORMANCE WIRING DIAGRAMS article. If test light does not illuminate at both terminals, go to next step. If test light does illuminate at both terminals, go to step  11.
  10. Repair open in Black/Orange wire between ISM and IG COIL fuse (15-amp) in dashboard fuse/relay block, or in Black wire between ISM and ground. Test drive vehicle to confirm repair.
  11. Replace ISM as necessary. Test drive vehicle to confirm repair.
  12. Reconnect 11-pin ISM harness connector. Remove electrical connector from each ignition coil. Using a test light connected to battery voltage, probe each ignition coil harness connector at terminal that goes to ISM. See IDENTIFYING IGNITION COIL TO ISM WIRES  table. While cranking engine, observe test light. If test light does not flash at each coil harness connector, go to next step. If test light does flash at each coil connector, go to step  14.
    IDENTIFYING IGNITION COIL TO ISM WIRES

    Ignition Coil/Cylinder No. Wire Color
    1 Red
    2 Red/Black
    3 Red/Blue
    4 Red/White
    5 Red/Blue
    6 Red/Green
  13. Repair open circuit in appropriate wire between coil connector and ISM connector. Test drive vehicle to confirm repair.
  14. Turn ignition on. Ensure all coil connectors are disconnected. Using a test light connected to ground, probe ignition feed circuit to each ignition coil harness 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  16.
  15. Repair open circuit in Black/Orange wire between appropriate ignition coil and IG. COIL fuse (15-amp) in underdash fuse/relay block. Test drive vehicle to confirm repair.
  16. Ensure all coil connectors are disconnected. Using a test light connected to battery voltage, test secondary ground circuit of each ignition coil at harness 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  18.
  17. Repair open circuit in Black wire between appropriate ignition coil and ground. Test drive vehicle to confirm repair.
  18. Test for fuel contamination. If fuel is contaminated, clean fuel system as necessary. Replace fuel filter and verify all fuel injectors are delivering fuel. Test drive vehicle to confirm repair. If fuel is not contaminated, go to next step.
  19. Remove any ignition coil. Install spark tester at spark plug end of coil. While cranking engine, check ignition coil for crisp, Blue spark. If poor spark or no spark is found, go to next step. If spark is okay, go to step  21.
  20. Replace faulty ignition coil. Repeat test from previous step for each ignition coil. Replace as necessary. Test drive vehicle to confirm repair.
  21. Repeat test from step  19 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). Attempt to start engine. If engine does not start, go to next step. If engine starts, install ignition coil screws and test drive vehicle to confirm repair.
  22. Remove all spark plugs. Inspect spark plugs for fouling, loose or missing electrodes, or cracked insulators. Clean or replace spark plugs as necessary. If spark plugs are okay, go to next step.
  23. 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 was found, repair as necessary. See appropriate article in ENGINES. If no problem was found, go to step  25.

  24. Using 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  34.
    NOTE: If scan tool is powered by cigarette lighter socket and display goes blank while cranking engine, it will be necessary to power scan tool directly from battery.
  25. Disconnect 7-pin Gray electrical 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  32.
  26. Connect test light between female side of 7-pin Gray electrical connector Red/Blue wire and each specified terminal. See 7-PIN GRAY CONNECTOR WIRE IDENTIFICATION  table. Turn ignition on. If test light illuminates and stays on at any terminal, go to next step. If test light does not illuminate and stay on at any terminal, go to step  29.
    7-PIN GRAY CONNECTOR WIRE 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
  27. Turn ignition off. Disconnect PCM connectors. Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step  33.
  28. Repair short to ground in appropriate injector driver circuit. See 7-PIN GRAY CONNECTOR WIRE IDENTIFICATION  table.
  29. Connect test light between female side of 7-pin Gray electrical connector Red/Blue wire and each specified terminal. See 7-PIN GRAY CONNECTOR WIRE IDENTIFICATION  table. Crank engine. If test light flashes at all terminals, go to step  31. If test light does not flash at all terminals, go to next step.
  30. Check for open in appropriate injector driver circuit. See 7-PIN GRAY CONNECTOR WIRE IDENTIFICATION  table. Repair as necessary. If no problem was found, go to step  33.
  31. Turn ignition off. Connect ohmmeter between male side of 7-pin Gray electrical connector (Red/Blue wire) and each specified injector wire. See 7-PIN GRAY CONNECTOR WIRE IDENTIFICATION  table. If resistance is about 12.5 ohms at all pins, go 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.
  32. Repair Red/Blue wire(s) between PCM harness connector, PCM main relay (located in fuse/relay box in engine compartment) and 7-pin Gray electrical connector. See ENGINE PERFORMANCE WIRING DIAGRAMS article.
  33. Replace and reprogram PCM. See PROGRAMMING in SELF-DIAGNOSTICS - 3.2L & 3.5L article. Verify system is operating properly.
  34. 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 wire (Yellow/Red wire on Trooper, White wire on Amigo and Rodeo). If test light does not illuminate, go to next step. If test light does illuminate, go to step  36.
  35. Repair open circuit or short to ground in Yellow/Red wire on Trooper or White wire on Amigo and Rodeo between CKP sensor and PCM harness connector S5.
  36. Turn ignition on. Connect a test light between CKP sensor harness Yellow/Red wire on Trooper or White wire on Amigo and Rodeo and CKP sensor ground wire (Green wire). If test light illuminates, go to step  38. If test light does not illuminate, go to next step.
  37. Repair open or short to voltage in Green wire between CKP sensor and ground. Test drive vehicle to confirm repair.
  38. Check for open or short in signal circuit (Yellow wire on Trooper, Gren/White wire on Amigo and Rodeo) between CKP sensor and PCM harness connector F73. Repair as necessary. If circuit is okay, go to next step.
  39. Replace CKP sensor. Verify system is operating properly. If system is still not operating properly, go to step  33.
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