1975 Datsun 280z FSM - Spooled up Racing

Emission Control System
1 Intake manifold
2 Throttle chamber
3 E.G.R. control valve
4 E.G.R. solenoid valve
5 Water temperature switch
6 Exhaust manifold
7 Fuse
8 Ignition switch
9 Battery
EC356
Fig. EC-18 Exhaust gas recirculation system
Open-close operation of the E.G.R.
control valve is controlled by the
throttle chamber vacuum.
The E.G.R. solenoid valve is operated
by the water temperature switch
operated by the engine coolant temperature.
OPERATION
The E.G.R. control system functions
as shown in the following chart.
E.G.R.
Switch Operating
Temperature
Water
Temperature
Switch
E.G.R.
Solenoid
Valve
Intake
Manifold
Vacuum
E.G.R.
Control
Valve
Driving
Condition
Below
ON
ON
Close
All condition
Not
Actuated
A
OFF
OFF
Above
—50 mmHg
(-1.969 inHg)
Close
Idling
57 to 63°C
(134 to 145°F)
Above
OFF
OFF
Below
—50 mmHg
(-1.969 inHg)
Close
Full Throttle
Actuated
Above
OFF
OFF
Above
-50 mmHg
(-1.969 inHg)
Open
Partial Load
EC-11