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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1149 (Engine Controls And Fuel - 3.6L - DTC P0137 To DTC P0497) >> DTC P0326, P0327, P0328, P0331, P0332, or P0333 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate KS.
    2. IMPORTANT: If the voltage is not within the specified range on either circuit, test for a wire to wire short, short to ground or voltage between the KS circuits.
  2. Ignition ON, test for 2-3 volts between the signal circuit terminal 1 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuits/connections test normal, replace the ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.
  3. Test for 2-3 volts between the low reference circuit terminal 2 and ground.
    • If less than the specified range, test the low reference circuit for a short to ground or an open/high resistance. If the circuits/connections test normal, replace the ECM.
    • If greater than the specified range, test the low reference circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.
  4. If all circuits/connections test normal, test or replace the KS sensor.
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