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Home >> Isuzu >> 2007 >> Ascender 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Engine Oil Pressure Gage Inaccurate or Inoperative (4.2L) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the EOP switch.
  2. Ignition ON, verify the scan tool Engine Oil Pressure Switch parameter is OK.
    • If not OK, test the signal circuit of the EOP switch for a short to ground. If the circuit tests normal replace the PCM.
  3. Ignition ON, perform the engine oil gage sweep test with the scan tool.
    • If the engine oil pressure gage does not sweep from its low to high position, replace the IPC.
  4. If all circuits test normal, test or replace the EOP switch.
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