Mazda 323 1988 Workshop Manual page 313

FUEL SYSTEM
4B
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FUEL PRESSURE
Note
a) When inspecting fuel pressure, use SST.
(Refer to page 48-39)
b) Warm up the engine to normal operating
temperature.
Injection Pressure
1. Set the lever on the adapter as shown in the figure.
2. Run the engine and measure the injection pres-
sure at various speeds,
Injection pressure: Approx. 240-279 kPa
(2.45-2.85
kg/cm', 34.8-40.5 psi)
3. If not within specification, check the fuel pump pres-
sure, fuel line pressure, and injector (Refer to page
48-47)
Fuel Pump Pressure
1. Connect the terminals of the test connector (yel-
low connector) with a jumper wire.
2. Turn the ignition switch ON to operate the fuel
pump.
3. Move the lever on the adapter as shown in the
figure.
4. Check the fuel pump pressure.
Fuel pump pressure: 441-588 kPa
(4.5-6.0
kg/cm', 64.0-85.3 psi)
5. If the fuel pump pressure is not within specifica-
tion, check the followings.
No pressure
Fuel pump operation (Refer to page 48-43)
Low pressure
Fuel pump feeding capacity (Refer to page
48-43)
High pressure
Replace the fuel pump
6. After checking the fuel pump pressure, disconnect
the jumper wire from the service connector.
323 Revised IO/87
48-41