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Home >> Hummer >> 2007 >> H3 Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Displays And Gages >> Diagnostic Information and Procedures >> DTC P0520 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the EOP switch.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and ground.
    • If greater than 1 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PCM.
  3. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the low reference circuit. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
    • If not Low, test the signal circuit of the EOP switch for an open/high resistance. If the circuit tests normal replace the PCM.
  4. If all circuits test normal, test or replace the EOP switch.
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