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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 P1391, P1392, or P1393 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the rough road sensor.
  2. Ignition ON, verify that the rough road sensor parameter is less than 0.1 volt.
    • If greater than 0.1 volt, test the signal circuit of the rough road sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
  3. Ignition ON, test for less than 0.2 volt between the low reference circuit and ground.
    • If greater than 0.2 volt, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  4. 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.
  5. Ignition ON, 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.
  6. Ignition ON, install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify that the rough road sensor parameter is greater than 4.8 volts.
    • If less than 4.8 volts, test the signal circuit of the rough road sensor for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  7. If all circuits/connections test normal, replace the rough road sensor.
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