Ford 2003 Mustang Workshop Manual page 2091

the color stripe of the vacuum hoses.
The PCV system uses the intake manifold vacuum to ventilate the crankcase and return the fumes to
the intake manifold for combustion.
EGR System Components
Item Part Number
1 12A65
2 9J459
3 9D475
4 9J433
5 —
6 9D477
The EGR system returns a portion of the exhaust gas to the intake manifold to reduce the combustion
temperature. This results in lower nitrous oxide formation.
The powertrain control module (PCM) controls the EGR vacuum regulator solenoid . The EGR vacuum
regulator solenoid controls the vacuum to the EGR valve. When the EGR valve opens, exhaust gas
flows to the intake manifold. The EGR transducer measures the flow through the EGR valve to exhaust
manifold tube and sends a signal to the powertrain control module. A metering orifice in the EGR valve
to exhaust manifold tube restricts the flow rate when the EGR valve is open.
The PCV valve:
controls the amount of ventilating air and blow-by gases going to the intake manifold.
prevents a backfire from reaching the crankcase.
The EGR valve to exhaust manifold tube:
connects the exhaust manifold to the EGR valve.
has two tubes connecting to the EGR transducer for EGR flow monitoring.
The EGR transducer:
monitors the EGR flow rate through the EGR valve to exhaust manifold tube.
sends an EGR flow rate signal to the powertrain control module.
The EGR vacuum regulator solenoid uses input from the powertrain control module to change the
EGR valve operation.
Description
Powertrain control module
EGR vacuum regulator solenoid
EGR valve
EGR transducer
Metering orifice
EGR valve to exhaust manifold tube