Ford Corsar Repair Manual page 174

E.C.C.S. DESCRIPTION
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E.C.C.S. Components
1
CA2OEI
AIR FLOW METER
The air flow meter measures the mass flowrate of intake air.
Measurements are made in such a manner that the control circuit
emits an electrical output signal in relation t o the amount of heat dis-
sipated from the hot wire placed in the stream of intake air.
compensation resistor
: Hot wire resistance
: Temperature compensation resistance
The air flowing around the hot wire removes the heat from the hot
wire. The temperature of the hot wire is very sensitive t o the mass
flowrate of the air. The higher the temperature of the hot wire, the
higher its resistance value. The change in the temperature (or: resist-
ance) is determined by the mass flowrate of the air. The control cir-
cuit accurately regulates current (I) in relation t o the varying
resistance value (R, ) so that V , always equals V , . The air flow meter
transmits an output for voltage V , t o the control unit where the out-
put is converted into an intake air signal.
l I I
Ignition switch
- 7
OFF
1
1
Self-cleaning
1
oFi=
3
OFF
10 sec.
1 sec.
Self-cleaning
After each 100kg of air mass flow through the air flow meter, the
E.C.M. operates a self-cleaning function the next time the engine is
stopped. The hot wire is heated t o approximately 1000°C t o burn off
any contamination which may have occurred. This is done
approximately 1 0 seconds after the key is turned off and is activated
for approximately 1 second.
' l
FUEL PUMP
The fuel pump assembly consists of an intake filter, a low pressure
vane pump element feeding a high pressure "G-rotor" pump element
motor, relief valve and check valve. This combination of low and
high pressure pump elements in series minimizes fuel pulsation,
therefore eliminating the need for a low pressure dampener.