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Home >> Chevrolet >> 2013 >> Sonic RS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls/Fuel - 1.8L (LUW, LWE) - DTC P0443 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P1400 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify none of the conditions listed below exists with the air intake system:
    • Damage, restriction, or modification
    • Dirty or deteriorating air filter element
    • Crankcase ventilation system for correct operation. Refer to Crankcase Ventilation System Inspection/Diagnosis
    • Water intrusion
    • Vacuum leak and other unmetered air downstream of the mass air flow (MAF) sensor
    • Intake manifold leak
      • If there is a condition, repair as necessary.
  2. Verify none of the conditions listed below exists with the exhaust system:
    • Water intrusion
    • Exhaust leak
    • Damaged, restricted, or modified exhaust system. Refer to Symptoms - Engine Exhaust
      • If there is a condition, repair as necessary.
  3. Inspect for an engine mechanical condition that could alter the air flow into the combustion chamber. Refer to Symptoms - Engine Mechanical
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