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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 P0400, P0401, P0402, or P1402 >> Circuit/System Testing
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Circuit/System Testing

  1. Verify that none of the following conditions exist:
    • Incorrect EGR valve for engine application
    • A vacuum leak between the EGR valve and the intake manifold
    • Signs of external leakage usually indicated by carbon buildup around the mating surfaces of the components or an audible exhaust noise
    • Restrictions in the passages or EGR valve caused by carbon deposits or casting flash
    • Leaks or restrictions at the MAP sensor
      • IMPORTANT: Restrictions can cause excessive back pressure and low engine vacuum.
    • Leaking, restricted, or modified exhaust system-Refer to Symptoms - Engine Exhaust .
    • Mechanical failure in the engine such as worn piston rings, camshaft or incorrect timing belt installation-Refer to Symptoms - Engine Mechanical .
  2. Ignition OFF, disconnect the harness connector of the EGR valve.
  3. Ignition OFF, connect a test lamp between the control circuit of the EGR valve and the positive battery terminal.
    • If test lamp illuminates, test the control circuit of the EGR valve for a short to ground. If the circuit/connections test normal, replace the ECM.
  4. If all circuits/connections test normal, replace the EGR valve.
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