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Home >> Chevrolet >> 2006 >> Epica LT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 2.5L (LBK) - DTC P0230 To DTC P0501 >> DTC P0329 or P0334 >> Circuit/System Testing

Circuit/System Testing

    IMPORTANT: If the knock sensor lead is damaged in any way, replace the knock sensor.
  1. Ignition OFF, disconnect the harness connector of the appropriate KS.
  2. Measure the voltage between the high reference circuit of the KS and ground. Verify that the voltage is less than 1.5 volts.
    • If the voltage is above the specified value test for a short to voltage on the high reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
  3. Measure the voltage between the low reference circuit of the KS and ground. Verify that the voltage is less than 1.5 volts.
    • If the voltage is above the specified value test for a short to voltage on the high reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
  4. Measure the resistance between the high reference circuit of the KS and ground. Verify that the resistance is between 96K-107K ohms.
    • If the resistance is above the specified value, test for an open/high resistance on the high reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
    • If the resistance is below the specified value, test for a short to ground on the high reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
  5. Measure the resistance between the low reference circuit of the KS and ground. Verify that the resistance is between 96K-107K ohms.
    • If the resistance is above the specified value, test for an open/high resistance on the low reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
    • If the resistance is below the specified value, test for a short to ground on the low reference circuit of the KS. If the circuits/connections test normal, replace the ECM.
  6. If all circuits/connections test normal, replace the appropriate KS sensor.
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