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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 P0443, P0458, or P0459 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the EVAP purge solenoid.
    NOTE: The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition circuit.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
  3. Connect a test lamp between the control circuit terminal 2 and the ignition voltage circuit terminal 1.
    NOTE: The control circuit for the EVAP purge solenoid is pulled-up to voltage within the ECM, 2.6-4.6 volts on the control circuit is normal.
  4. Command the EVAP purge solenoid to 50 % and then to 0 % with a scan tool. The test lamp should illuminate or flash and then go OFF.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Test for 2.6-4.6 volts between the control circuit terminal 2 and the ECM housing.
    • If the voltage is not within the specified range, replace the ECM.
  6. If all circuits test normal, test or replace the EVAP purge solenoid.
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