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Home >> Chevrolet >> 2010 >> Impala Police >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 3.5L - DTC P0341 - DTC P2544) >> DTC P0641 or P0651 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE: A short to voltage on the signal circuit of certain components may cause this DTC to set.
  1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids  for the appropriate sensors.
  2. Ignition ON, measure for 4.8-5.2 V between one of the 5 V reference circuits and ground.
    • If less than the specified range, test for a short to ground on all the 5 V reference circuits. If all circuits test normal, replace the K20 ECM.
    • If greater than the specified range, test for a short to voltage on all the 5 V reference circuits. If all circuits test normal, replace the K20 ECM.
  3. Connect each component associated with the 5 V reference circuit, one at a time, while monitoring the voltage. Verify the voltage remains between 4.8-5.2 V.
    • If not within the specified range when a component is connected, test the signal circuit for a short to voltage. If the circuit tests normal, replace the appropriate component.
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