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Home >> Suzuki >> 2006 >> Swift + >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - 1.6L (L91) - DTC P0016 To DTC P0404 >> DTC P0122 or P0123 (w/o Throttle Actuator Control) >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the TP sensor.
  2. Ignition ON, verify that the TP sensor voltage parameter is less than 0.3 volt.
    • If greater than 0.3 volt, test the signal circuit of the TP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
    IMPORTANT: The test lamp is used to load the circuit and may not illuminate.
  3. Ignition ON, connect a test lamp between the 5-volt reference circuit of the TP sensor and a good ground.
    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.
  4. Test for 4.8-5.2 volts between the 5-volt reference circuit of the TP sensor and a good ground.
    • If less than 4.8 volts, test the 5-volt reference circuit of the TP sensor 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 of the TP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. Ignition ON, test for less than 0.2 volt between the low reference circuit of the TP sensor and a good ground.
    • If greater than 0.2 volt, test the low reference circuit of the TP sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
  6. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit of the TP sensor and a good ground.
    • If greater than 5 ohms, test the low reference circuit of the TP sensor for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  7. Ignition ON, install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit of the TP sensor to verify that the TP sensor voltage parameter is greater than 4.8 volts.
    • If less than 4.8 volts, test the appropriate signal circuit of the TP sensor for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  8. If all circuits/connections test normal, test or replace the TP sensor.
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