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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 639 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Engine Oil Pressure Indicator Always On >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Do not turn the key to the crank position or engage the starter at any time during diagnosis.
  1. Ignition ON, verify the scan tool Engine Oil Pressure (EOP) Switch parameter is Low.
    • If not Low, replace the instrument panel cluster (IPC).
  2. Ignition OFF, disconnect the EOP switch.
  3. 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 ECM.
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