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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 P0452 or P0453 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the FTP sensor.
  2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.
    • If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
      IMPORTANT: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.
  3. Test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
    • If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.
    • If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  4. Ignition ON, verify that the FTP Sensor parameter is less than 4.8 volts.
    • If greater than 4.8 volts, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. Ignition ON, install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify that the FTP Sensor parameter is greater than 4.8 volts.
    • If less than 4.8 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  6. If all circuits/connections test normal, test or replace the FTP sensor.
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