Positive Crankcase Ventilation System
The positive crankcase ventilation system consists of a valve and several hoses.
The positive crankcase ventilation system recycles crankcase gases back through the engine where they mix with incoming air/fuel charge.
The positive crankcase ventilation valve regulates the amount of ventilation air and crankcase gas supplied to the intake manifold and also prevents backfiring into the crankcase.
The positive crankcase ventilation system helps to reduce hydrocarbon emissions from the engine.
Exhaust Gas Recirculation System
The exhaust gas recirculation system consists of a valve, a vacuum regulator valve, a tube and a differential pressure sensor.
The exhaust gas recirculation system recycles measured quantities of exhaust gas back through the engine where they mix with incoming fuel/air charge.
The powertrain control module controls the vacuum regulator valve with grounding pulses. This regulates the amount and duration of the vacuum signal supplied to the exhaust gas recirculation valve and thus the valve lift and opening time are controlled.
The differential pressure sensor provides the powertrain control module with data relating to the exact amount of exhaust gas being recirculated by measuring the differential pressure across a calibrated orifice in the supply hose. Thus, closed loop control is achieved.
A2: CHECK DPFE SIGNAL CIRCUIT FOR SHORTS TO GROUND
Pinpoint Test A
A6: CHECK THE DPFE CIRCUIT FOR GROUND SUPPLY
Pinpoint Test A
B2: CHECK THE DPFE SIGNAL CIRCUIT FOR SHORTS TO GROUND
Pinpoint Test B
B6: CHECK THE DPFE CIRCUIT FOR GROUND SUPPLY
Pinpoint Test B
C1: CHECK THE VOLTAGE SUPPLY TO THE EGR VACUUM REGULATOR
Pinpoint Test C
C2: CHECK THE VOLTAGE SUPPLY TO THE EGR VACUUM REGULATOR
Pinpoint Test C
C3: CHECK THE VOLTAGE SUPPLY TO THE EGR VACUUM REGULATOR
Pinpoint Test C
C4: CHECK THE GROUND SUPPLY/SIGNAL TO THE EGR VACUUM REGULATOR
Pinpoint Test C
C5: CHECK THE CONTINUITY OF THE SIGNAL TO THE EGR VACUUM REGULATOR
Pinpoint Test C
C6: CHECK THE SIGNAL TO THE EGR VACUUM REGULATOR FOR SHORT TO GROUND
Pinpoint Test C
Scheme 26
Scheme 27
Scheme 28
- Disconnect the differential pressure feedback EGR sensor electrical connector.
- Disconnect the hoses from the differential pressure feedback EGR sensor.
- Remove the differential pressure feedback EGR sensor.