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Home >> Pontiac >> 2006 >> GTO Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.0L - DTC P0449 To P2122 >> DTC P1682 >> Circuit/System Testing

Circuit/System Testing

  1. If DTCs P0685, P0689, or P0690 are set, test and repair those DTCs first.
  2. Obtain access to the ignition switch electrical connector.
  3. With the key OFF, test for battery positive voltage to the ignition switch.
    • If less than battery positive voltage test and repair for an open/high resistance, or short to ground, in the voltage supply circuit to the ignition switch. All wire circuit resistance should measure 2 ohms or less.
  4. With the ignition ON, perform a voltage drop test across the ignition switch. Measure the amount of voltage drop between the battery positive voltage input terminal/connector, and the ignition 1 voltage output terminal/connector at the ignition switch. The amount of voltage drop should not exceed 300 millivolts.
    • If you measure more than 300 millivolts, inspect and test the ignition switch electrical terminals and mating wire harness electrical connector for corrosion and terminal tightness.
    • If the electrical terminals/connections test normal, replace the ignition switch.
  5. With the ignition OFF, disconnect the ignition switch electrical connector that contains the ignition 1 voltage circuit to the ECM. Disconnect the ECM electrical connector that contains the ignition 1 voltage circuit from the ignition switch.
    • Test and repair if necessary, the ignition 1 voltage circuit for an open/high resistance, or a short to ground. All circuit resistance should measure 2 ohms or less.
    • If the circuit tests normal, replace the ECM.
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