1975 Datsun 280z FSM - Spooled up Racing

Emission Control System
When catalyzer warning lamp lights
If catalyzer warning lamp lights,
check the following items.
(1) Disconnect connectors of catalyzer
temperature sensor (when catalytic
converter is cold), and measure
resistance of catalytic sensor with a
circuit tester.
If tester reading is more than 100
Kfi, the unit is normal.
If tester reading is less than 100
K£2, replace catalyzer temperature sensor.
(2) Check catalyzer temperature
warning device. (Refer to "Inspection
of Catalytic Warning System".)
2. Check the pre-set value of Boost
Controlled Deceleration Device and
correct if necessary. (Refer to "Inspection
of B.C.D.D.".)
3. Check ignition system for the
following items, and correct if necessary.
(Refer to "Inspection of Ignition
System" in the "Engine Electrical"
section.)
(1) Ignition Amp
(l)-(a) Faulty circuit
(l)-(b) Connections loose or disconnected
(2) Distributor
(2)-(a) Open coil
(2)-(b) Improper air gap
(2)-(c) Electricity leak at cap and
rotor head
(3) Ignition coil
(3)-(a) Layer short circuit
(4) High tension cord
(4)-(a) Electricity leak
(4)-(b) Wire disconnected
(5) Spark plugs
(5)-(a) Dirty
(5)-(b) Electricity leak at upper
porcelain insulator
Fig. EC-46 Connecting emission adjuster
4. Check catalytic converter. (Refer
to "Inspection of Catalytic Converter".)
5. Check catalyzer temperature sensor.
(Refer to "Inspection of Catalyzer
Temperature Sensor".)
EC-27
IGNITION
SWITCH
FLOOR
SENSOR
FLOOR
TEMPERATURE
WARNING SYSTEM
DESCRIPTION
The floor temperature warning
system consists of a floor sensor installed
on the car's floor, floor temperature
relay and a floor temperature
warning lamp on the instrument panel
and wires that connect these parts.
When the floor temperature rises to
an abnormal level, the warning lamp
will light to call the attention of the
driver. The wiring diagram of this
system, and location of the floor
sensor are illustrated in Figures EC-47
and EC-48.
FLOOR SENSOR
RELAY
FLOOR TEMPERATURE
LAMP
EC 397
Fig. EC-47 Floor warning system circuit
Floor sensor
EC398
Fig. EC-48 Location of floor sensor