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Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD) System Check. See SELF-DIAGNOSTICS - INTRODUCTION article. Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Review FAILURE RECORDS data. If other DTCs are stored, diagnose affected DTCs. If no other DTCs are present, go to next step.
  3. Perform CKP system variation learning procedure. See PROGRAMMING . After procedure is complete, go to next step.
  4. Ensure Tech 2 scan tool is installed. Start engine and allow it to idle. Using scan tool, read MAP sensor voltage. If voltage is greater than 4 volts, go to DTC P0108: MAP SENSOR CIRCUIT HIGH VOLTAGE . If voltage is not greater than 4 volts, go to next step.
  5. Turn ignition off, and then on. Duplicate conditions required to set DTC. Using scan tool, read DTC PRESENT THIS IGNITION CYCLE. If scan tool displays DTC P0300, PRESENT THIS IGN, go to next step. If scan tool does not display DTC P0300, PRESENT THIS IGN, go to step  11.
  6. Using scan tool, review misfire index. If misfire index is increasing for more than one cylinder, go to DIAGNOSTIC AIDS . If misfire index is not increasing for more than one cylinder, go to next step.
  7. Install a spark tester on No. 1 spark plug wire. Disconnect fuel injector harness at intake manifold. Crank engine and check for spark at tester. Repeat procedure for each spark plug wire. If spark was okay on all wires, go to next step. If spark was not okay on all wires, check spark plug wires and ignition system components. See IGNITION SYSTEM in SERVICE & ADJUSTMENT SPECIFICATIONS article.
  8. Remove and check spark plugs for wear, excessive air gap, cracks or fouling. If spark plugs are okay, go to next step. If spark plugs are not okay, go to step  12.
  9. Perform cylinder compression test. See SERVICE & ADJUSTMENT SPECIFICATIONS article. If mechanical problem is found, repair or replace as necessary. After repair, go to step  14. If no problem was found, go to next step.
  10. Diagnose fuel system. See FUEL SYSTEM DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES article. If fuel system is okay, go to next step. If problem is found, go to step  13.
  11. DTC P0300 is intermittent. If any additional DTCs are set, diagnose affected DTCs. If no additional DTCs are set, See DIAGNOSTIC AIDS .
  12. Replace spark plug(s). After replacing spark plugs, go to step  14.
  13. Repair fuel system as necessary. After repair, go to next step.
  14. Using scan tool, select DTC, CLEAR INFO function. Start engine and allow it to reach operating temperature. Using scan tool, select DTC, SPECIFIC function and enter DTC P0300. Operate vehicle within conditions required to set DTC. If scan tool displays RAN AND PASSED, go to next step. If scan tool does not display RAN AND PASSED, return to step  2.
  15. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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