Fuel and Emissions Systems

Symptom Troubleshooting Index (cont'd)

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Symptom Diagnostic Procedure Also check for
Misfire or rough
  1. Intake System.

    (Intake manifold, air cleaner, MAF sensor)

  2. ECM (ECT Sensor, ECM)
  3. Vehicle Speed Sensor
  4. Exhaust System.

    (EGR system, Turbocharger, Vacuum system)

  5. BARO Sensor
  6. Injector
  • Low Compression
  • Engine Mechanical
Fail emission test
  1. Intake System.

    (Intake manifold, air cleaner, MAF sensor)

  2. Oil viscosity
  3. BARO Sensor
  4. Exhaust System.

    (EGR system, Turbocharger, Vacuum system)

  5. Fuel Injection System.

    (Injector, Supply Pump, Common Rail)

  6. Catalyst Converter.
  • Contaminated Fuel
  • Engine Oil Quality
Loss of power
  1. Fuel filter, Fuel Line, Fuel, Fuel Condition.
  2. Throttle System.

    (AP Sensor, Throttle cable)

  3. Intake System.

    (Intake manifold, air cleaner, MAF sensor)

  4. Fuel Injection System.

    (Injector, Supply Pump, Common Rail with RP sensor)

  5. Exhaust System.

    (EGR system, Turbocharger, Vacuum system)

  6. BARO Sensor
  7. Vehicle Speed Sensor
  8. Air Condition System
  • Low Compression
  • Engine Mechanical
  • Chassis Parts Error
Hesitation/Surging
  1. Fuel filter, Fuel Line, Fuel, Fuel Condition.
  2. Exhaust System.

    (EGR system, Turbocharger, Vacuum system)

  3. Intake System.

    (Intake system, filter)

  4. Fuel Injection System.

    (Injector, Supply Pump, Common Rail)

  5. Vehicle Speed Sensor
  6. Air Condition System
  • Engine Mechanical
  • Chassis Parts Error

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