Your Vehicle: 2001 Ford Escort ZX2 L4-2.0L DOHC VIN 3
 
Vehicle » Powertrain Management » Computers and Control Systems » Testing and Inspection » Diagnostic Trouble Code Tests and Associated Procedures » SECTION 5: Pinpoint Tests » HG: Positive Crankcase Ventilation (PCV) System - Pinpoint Test  
 
 
  HG: Positive Crankcase Ventilation (PCV) System - Pinpoint Test  
 

HG: Positive Crankcase Ventilation (PCV) System

HG: Introduction See: HG: Positive Crankcase Ventilation (PCV) System - Introduction

HG1 STUCK PCV VALVE CHECK

  • Verify PCV valve maintenance schedule has been followed.
  • Verify proper PCV valve part number.
  • Verify clean PCV valve.
  • Shake the PCV valve.

Does PCV valve rattle when shaken?
Yes

  • REINSTALL PCV valve. GO to HG2

.

No

  • PCV valve is sticking.
  • REPLACE PCV valve. VERIFY a symptom no longer exists.

HG2 PCV SYSTEM CHECK

  • Start engine and bring to normal operating temperature.
  • Disconnect closure (fresh air) hose from remote air cleaner or air outlet tube (tube connecting mass air flow sensor and throttle body).
  • Place a stiff piece of paper over the hose end. Wait one minute.

Does vacuum hold the paper in place?
Yes

causes of vehicle symptoms.

No

  • System is leaking/plugged or Evaporative Emission System is

leaking. GO to HG3
.

HG3 EVAPORATIVE EMISSION SYSTEM CHECK

Note: If the evaporative emission hose is not connected to the PCV hose, follow the No Action to Take (refer to VECI decal).

  • Disconnect evaporative emission hose at connection to PCV hose (if equipped). Cap the connector.
  • Again place a stiff piece of paper over the closure (fresh air) hose end, as inHG2 . Wait one minute.

Does vacuum now hold the paper in place?
Yes

No

  • CHECK for vacuum leaks/obstruction in the PCV system (such as

oil cap, PCV valve, hoses, cut grommets, valve cover bolt torque/gasket leak).
REPAIR as necessary.