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Home >> Saturn >> 2007 >> Relay 3.9 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P0442 To DTC P2544 >> DTC P0641 or P0651 >> Circuit/System Testing
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Circuit/System Testing

IMPORTANT:
  • Additional DTCs will set when disconnecting the components.
  • 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.
  2. Ignition ON, measure for 4.8-5.2 volts between one of the 5-volt reference circuits and ground.
    • If the voltage is less than the specified value, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the control module.
    • If the voltage is greater than the specified value, test for a short to voltage on all the 5-volt reference circuits, or the signal circuit, for each component associated with the appropriate 5-volt reference circuit. If all circuits test normal, replace the control module.
  3. Connect each component associated with the 5-volt reference circuit, one at a time, while monitoring the voltage. The voltage should not change more than 1 volt.
    • If the voltage display changes more than the specified value when a component is connected, replace the component.
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