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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1857 (Engine Controls And Fuel - 3.5L (L66) - DTC P0030 To DTC P0222) >> DTC P0116 or P2183 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the ECT sensor.
  2. Ignition ON, clear the DTC information with a scan tool.
  3. Ignition ON, verify that the scan tool ECT sensor parameter is at -40°C (-40°F).
    • If greater than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PCM.
  4. Test for less than 0.5 volt between the low reference circuit and ground.
    • If greater than specified value, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the PCM.
  5. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the PCM.
  6. Ignition ON, clear the DTC information with a scan tool.
    7. IMPORTANT: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.
  7. Install a 1A fused jumper wire between the signal circuit and the low reference circuit. Verify the ECT sensor parameter is greater than 168°C (334°F).
    • If less than specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit test normal, replace the PCM.
  8. If all circuits test normal, test or replace the ECT sensor.
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