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Home >> Suzuki >> 2008 >> XL7 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0128 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the ECT sensor.
    CAUTION: Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current draw.
    NOTE: The control module or the sensor may be damaged if the circuit is shorted to battery positive voltage.
  2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.
    • If greater than 5 ohms, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify the scan tool ECT sensor parameter is at -40 °C (-40 °F).
    • If greater than -40 °C (-40 °F), test the signal circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
      NOTE: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the ECT sensor may be damaged.
  4. Install a 3A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool ECT sensor parameter is greater than 142 °C (288 °F).
    • If less than the specified value, test the signal circuit for an open/high resistance or for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. If all circuits test normal, test or replace the ECT sensor.
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