Fuel Pressure; Fuel Pump Pressure - Mazda 626 MX-6 Workshop Manual

FUEL PRESSURE

Note
a) When inspecting fuel pressure, use the
SST. (Refer to page 4A—48).
b)Warm up the engine to normal operating
temperature.
Injection Pressure
1. Set the lever on the adapter as shown in the figure.
86U04A-073
2. Run the engine and measure the injection pres­
sure at various speeds.
Injection pressure: Approx. 235—275 kPa
(2.4—2.8 kg/cm2, 34—40 psi)
3. If not within specification, check the fuel pump pres­
sure and fuel line pressure.
86U04A-074

Fuel Pump Pressure

1. Connect the terminals of the test connector (Yel­
low) with a jumper wire.
connector
(Yellow) 2. Turn the ignition switch ON to operate the fuel
pump.
3. Set 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/cm2, 64—85 psi)
86U04A-075
5. If the fuel pump pressure is not within specifica­
tion, check the following;
No pressure
•Fuel pump operation (Refer to page
4A—50.)
Low pressure
•Fuel pump feeding capacity (Refer to page
4A—51.)
High pressure
•Replace the fuel pump
. After checking the fuel pump pressure, disconnect
6
the jumper wire from the test connector.
4A
FUEL SYSTEM
4A-49