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Home >> Suzuki >> 2007 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls & Fuel - 1.6L - DTC P0324 To P0651 >> DTC P0403, P0404, P0405, P0406, or P042E >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the EGR valve.
  2. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit and ground.
    • If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary.
  3. Ignition OFF, verify a test lamp does not illuminate between the control circuit and B+.
    • If test lamp illuminates, test the control circuit for a short to ground. If the circuit/connections test normal, replace the ECM.
  4. Ignition ON, With a scan tool, command the EGR valve to 100 percent. The test lamp should illuminate.
    • If test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  5. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  6. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
    • If less than the specified range, 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 the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  7. Ignition ON, verify that the EGR position sensor parameter is less than 3 percent.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  8. Ignition ON, install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify that the EGR position sensor parameter is greater than 95 percent.
    • If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  9. If all circuits/connections test normal, test or replace the EGR valve.
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