1975 Datsun 280z FSM - Spooled up Racing

Engine Fuel
8 degrees. Continuity should not exist
when the flap is fully closed. If continuity
does not exist when the flap is
opened, or continuity occurs at a
different position, replace air flow
meter as an assembly.
2. Disconnect air flow meter.
3. Measure the outside air temperature.
4. Measure resistance between terminals
@ and (6) of the air flow
meter connector.
EF398
Fig. EF-65 Checking voltage variation
between terminals (8) and (J)
2-2. Checking insulation
resistance of air flow meter
Check insulation resistance between
the flow meter body and any one of
terminals ©, ®, (8) and (§). If
continuity exists, the air flow meter is
out of order.
EF401
Fig. EF-68 Checking fuel pump
contact points
3. Air temperature
3-1. Checking continuity
1. Disconnect battery ground cable.
EF402
Fig. EF-69 Measuring the resistance
of air temperature sensor
The relationship between the outside
air temperature and resistance is
shown in the following chart.
EF399
Fig. EF-66 Checking insulation
resistance
2-3. Checking flap
Fully open the flap by hand to
check that it opens smoothly without
binding. If it doesn't, it is out of order.
Air temperature
°C (°F)
-30 (-22)
-10 (-14)
10(50)
20 (68)
50(122)
80(176)
If test results are far from the range
indicated in the chart, the air temperature
sensor is out of order. The air
temperature sensor and air flow meter
should be replaced as an assembly.
Resistance
(k£2)
20.3 to 33.0
7.6 to 10.8
3.25 to 4.15
2.25 to 2.75
0.74 to 0.94
0.29 to 0.36
EF400
Fig. EF-67 Checking flap
2-4. Checking fuel pump contact
points
Continuity should exist between
terminals @ and @ of the air flow
meter when the flap is opened approx.
3-2 Checking insulation
resistance
Check insulation resistance between
terminal @ and air flow meter body.
If continuity exists, the air temperature
sensor is out of order. The air
temperature and air flow meter should
be replaced as an assembly.
EF-52
EF403
Fig. EF-70 Checking insulation
resistance
4. Water temperature sensor
This check can be done with the
sensor either on or off the vehicle.