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Home >> Suzuki >> 2007 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls & Fuel - 1.6L - DTC P0016 To P0317 >> DTC P0171, P0172, P2187, or P2188 >> Circuit/System Testing
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Circuit/System Testing

  1. Verify that none of the following conditions exist:
    • Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • Splits, kinks, or improper connections at the vacuum hoses
    • The fuel system is operating lean or rich. Refer to Fuel System Diagnosis .
    • The fuel injectors are operating lean or rich. Refer to Fuel Injector Solenoid Coil Test .
    • Missing, restricted, or leaking exhaust components-Refer to Symptoms - Engine Exhaust .
    • Vacuum leaks at the intake manifold, throttle body, and injector O-rings - P0171 or P2187
    • Leaking crankcase ventilation system - P0171 or P2187
    • The air intake duct for being collapsed or restricted possibly by a restricted air filter - P0172 or P2188
    • Leaking fuel pressure regulator-Inspect for evidence of fuel in the vacuum line. Refer to Fuel System Diagnosis - P0172 or P2188.
    • Excessive fuel in the crankcase - P0172 or P2188
    • The incorrect operation of the evaporative emission control system - P0172 or P2188
  2. If all conditions test normal, test the engine for a mechanical condition. Refer to Symptoms - Engine Mechanical .
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