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Home >> Suzuki >> 2006 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.6L (L91) - DTC P0420 To DTC P2076 >> DTC P0641 or P0651 >> Circuit/System Testing
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Circuit/System Testing

    IMPORTANT: Additional DTCs will set when disconnecting the components.
  1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.
  2. Ignition ON, measure for 4.6-5.4 volts between one of the 5-volt reference circuits and ground.
    • If the voltage is less than 4.6 volts, 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 5.4 volts, 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.
    IMPORTANT: A short to voltage on the signal circuit of certain components may cause this DTC to set.
  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 0.5 volt.
    • If the voltage display changes more than the specified value when a component is connected, replace the component.
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