1975 Datsun 280z FSM - Spooled up Racing

Engine Tune-up
4. If voltmeter reading is not as
specified, check hold relay unit and
wiring indicated by large solid lines. If
the above unsatisfactory condition still
exists, replace switching module.
(B
5. Check continuity between switching
module terminal 0 and catalyzer
temperature sensor terminal @, and
between switching module terminal
(2) and catalyzer temperature sensor
3
1
B
terminal @. If continuity exists between
two sets of terminals, the circuit
indicated by large solid lines in Figure
ET-59 is OK.
B
GY
f
/ \
GY
SWITCHING
MODULE
m
CATALYZER f
TEMPERATURE
SENSOR
XOB
®
©
GY ©
JB
®
.©
@®
w
W
FUNCTION
TEST CONNECTOR
e
TO IGNITION SWITCH
CATALYZER
WARNING
LAMP
GY
BY
@®
@®
B
GY
CATALYZER
HOLD RELAY
O
O
O -o
fc^ALG
o—o
o—o
o—o
a O
FUSE BOX
o—o
o—o
o—o
o—o
o—o
o
@ Q^O
ST L
BY
TO STARTER SWITCH
ET-24
EC391
Fig. ET-59 Wiring diagram 3