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Home >> Chevrolet >> 2007 >> Impala LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433 >> DTC P1682 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition ON, observe the Ignition 1 Signal and EC Ignition Relay Feedback scan tool parameters to determine which is less than B+.
  2. Ignition OFF, remove the relay that corresponds to the scan tool parameter that is less than B+.
  3. Ignition ON, connect a 3A fused jumper wire between B+ and the applicable ignition 1 circuit terminal. Verify that the applicable scan tool parameter displays B+.
    • If the applicable scan tool parameter is less than the specified value, test the ignition 1 circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
      IMPORTANT: 6 ohms or greater in the circuit/underhood fuse block will cause the DTC to set.
  4. If all circuits test normal, test or replace the applicable relay/underhood fuse block.
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