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HOMESERVICE MANUALSISUZU1992RODEO LS, 4WD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGDIAGNOSTIC CHARTSCHART A-3 - ENGINE CRANKS BUT WILL NOT RUN (3.1L)NOTES
1992 Isuzu Rodeo LS, 4WD, Standard

Chart A-3 - Engine Cranks But Will Not Run (3.1L): Notes

1992 Isuzu Rodeo LS, 4WD, StandardSECTION Notes
NOTE: Before performing this test, check battery condition, engine cranking speed and tank for adequate fuel. Test numbers refer to test numbers on diagnostic chart.
  1. When ignition is turned on, the CHECK ENGINE light should come on. This proves battery voltage and ignition voltage are being supplied to ECM. If NO ALDL data (trouble codes) are displayed on Scan tester, this may be due to ECM problem. Appropriate TESTS W/CODES article in the ENGINE PERFORMANCE Section will diagnose CHECK ENGINE light. If TPS voltage is more than 2.5 volts, engine may be in "clear flood" mode, which will cause starting problems. Engine will not start without ignition reference signals. Scan tester should indicate engine speed (RPM) during cranking.
  2. No spark may be caused by one of several components related to ignition system. See IGNITION CHECKS in this article for diagnosing ignition problems related to a no-spark condition.
  3. Fuel spray from injectors indicates fuel is available. However, engine could be severely flooded because of too much fuel.
  4. While cranking engine, there should be no fuel spray with injector disconnected. Replace injector if it sprays or drips fuel while disconnected.
  5. Fuel pressure will drop after fuel pump stops due to a controlled bleed in fuel system. Use of fuel pressure gauge determines if fuel system pressure is enough for engine to start and run.
  6. No fuel spray from injector indicates a faulty fuel system, or no ECM control of injector.
  7. This test determines if ignition module is not generating reference pulse, or if fault is wiring or ECM. Using a test light connected to 12 volts, momentarily touch circuit No. B5 (Pink/Black wire). A reference pulse should be generated. If injector test light blinks, ECM and wiring are okay.
  8. No fuel spray from one injector indicates a faulty fuel injector or no ECM control of injector. If test light blinks while cranking, ECM control should be considered okay. Ensure test light makes good contact between connector terminals during test. Light may be a little dim when it is blinking because of test light current draw. Brightness of blink is not important.
  9. Circuit No. A6 (Light Green/Red) supply ignition voltage to injectors. Probe each connector terminal with test light to ground. There should be a light on at one terminal. If test light confirms ignition voltage at connector, ECM injector control circuits No. D16 or D14 may be open. Reconnect injector. Using a test light connected to ground, check at ECM connector terminal D16 or D14. A light at this point indicates injector is shorted. Replace injector and ECM.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.