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Home >> Isuzu >> 1999 >> Trooper Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics (Introduction) >> On-Board Diagnostic II (OBD-II) System Check >> Hombre 2.2L

Hombre 2.2L

NOTE: Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm impedance, unless stated otherwise in test procedure.
  1. Turn ignition on with engine off. If Malfunction Indicator Light (MIL) illuminates, go to next step. If MIL does not function properly, go to MALFUNCTION INDICATOR LIGHT (MIL) INOPERATIVE in BASIC DIAGNOSTIC PROCEDURES article.
  2. Turn ignition off. Install Tech 2 scan tool and follow scan tool manufacturer's instructions to proceed with test. Turn ignition on. If scan tool displays PCM data, go to next step. If scan tool does not display PCM data, see BASIC DIAGNOSTIC PROCEDURES article.
  3. Using scan tool, command MIL to turn off. If MIL turns off, go to next step. If MIL does not turn off, go to MIL ON STEADY.
  4. Using scan tool, check if any LAST TEST FAIL, HISTORY or MIL REQUEST DTC(s) are stored. If DTC(s) exist, go to next step. If DTC(s) do not exist, go to step  6 .
  5. Using scan tool, store FREEZE FRAME and FAILURE RECORDS data. Diagnose any stored DTC. See SELF-DIAGNOSTICS - INTRODUCTION and appropriate SELF-DIAGNOSTICS articles.
  6. Attempt to start engine. If engine starts and runs, go to next step. If engine does not start, or starts and dies, see BASIC DIAGNOSTIC PROCEDURES article.
  7. Turn ignition on with engine off. Check Engine Coolant Temperature (ECT) and Throttle Position (TP) sensors for proper operation. Start and warm engine to normal operating temperature. Check ECT sensor, MAP sensor, O2 sensors, and IAC valve for proper operation. Compare scan tool engine data with actual control system data values. If value is within limits, see TROUBLE SHOOTING - NO CODES article. If value is not within limits, go to SYSTEM & COMPONENT TESTING article.
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