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Diagnosis and Testing|Removal and Installation > < 303-08B Engine Emission Control - 1.8L Duratec-HE (MI4)-2.0L Duratec-HE (MI4)|Specifications

Focus 2004.75 (07.2004-)

Engine Emission Control - 1.8L Duratec-HE (MI4)/2.0L Duratec-HE (MI4) - Engine Emission Control Focus 2004.75 (07/2004-)
Diagnosis and Testing

General Equipment
Worldwide Diagnostic System (WDS)

Inspection and Verification

  1. Verify the customer concern.
  1. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical Electrical
  • Hose(s)/hose joints
  • Gasket(s)
  • Positive crankcase ventilation (PCV) valve
  • PCV separator
  • Exhaust gas recirculation (EGR) valve
  • Electrical connector(s)
  • Wiring harness
  • Fuse(s)
  • Relay
  • EGR valve
  • Powertain control module (PCM)
  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.

Symptom Chart

Symptom Chart

Symptom Possible Sources Action
Poor engine performance
*
EGR valve.
*
Using WDS, CHECK the EGR Valve Duty Cycle input signal to the EGR vacuum regulator valve. If the result is 0%, REMOVE the EGR valve.
REFER to Exhaust Gas Recirculation (EGR) Valve - in this section.
INSPECT the EGR valve and valve seat for damage. Make sure that the EGR valve is in the closed position. If the EGR valve is not closed. INSTALL a new EGR valve. TEST the system for normal operation. If the result is not 0% continue the engine diagnostic using WDS.
Excessive crankcase pressure
*
Blocked or damaged PCV hose(s).
*
Blocked crankcase vent oil separator.
*
CHECK the PCV system components for blockages, CLEAN or INSTALL new components as necessary.
*
Worn or damaged engine components.
*
REFER to Section  303-01A Engine / 303-01B Engine / 303-01C Engine / 303-01D Engine / 303-01F Engine / 303-01G Engine / 303-01H Engine.

Diagnosis and Testing|Removal and Installation > < 303-08B Engine Emission Control - 1.8L Duratec-HE (MI4)-2.0L Duratec-HE (MI4)|Specifications