On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 5: Pinpoint Tests

HG: Positive Crankcase

Does PCV valve rattle when shaken?

Yes	No
REINSTALL PCV valve. GO to HG2 .	PCV valve is sticking. REPLACE PCV valve. VERIFY a symptom no longer exists.

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	No
PCV System is OK. RETURN to Section 3 for other possible causes of vehicle symptoms.	System is leaking/plugged or Evaporative Emission System is leaking. GO to HG3 .

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 in HG2 . Wait one minute.

Does vacuum now hold the paper in place?

Yes	No
PCV system is OK. GO to Evaporative Emission System Testing. For all others: GO to Pinpoint Test Step HX47 . Flexible fuel vehicles: GO to Pinpoint Test Step HX94 .	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.