Mazda 323 1988 Workshop Manual page 241

FUEL SYSTEM
4A
injector (On-vehicle inspection)
1. Warm up the engine and run at idle.
2. Check the operating sound of the injector, using
a sound scope. Check that operating sounds are
produced from each injector at idle and at ac-
celeration
3. If operating sound is not produced, check the foi-
lowings.
l
Wiring harness
l
Injector resistance
l
Engine control unit terminal voltage of 3C, 3E,
38, and 3D (refer to page 4A-62).
injector (Resistance)
Warning
Before performing following procedures, re-
lease the fuel pressure to reduce the possi-
bility of injury or fire. (Refer to page 4A-34)
1. Remove the injector from the engine. (Refer to
page 4A-44)
2. Check that the resistance of the injector.
Resistance: 11-l 5 61
Injector (Leak test)
Warning
Before performing following procedures, re-
lease the fuel pressure to reduce the possi-
bility of injury or fire. (Refer to page 4A-34)
1. Remove the delivery pipe, injector, and pressure
regulator. (Refer to page 4A-44)
2. Affix the injectors to the distribution pipe with wire.
Caution
Affix the injectors firmly to the distribution
pipe so no movement of the injectors is
possible.
3. Connect the distribution pipe assembly between
the fuel filter and the return pipe.
4. Connect the return hose to the pressure regulator.
5. Connect the negative terminal of the battery.
Warning
Be extremely careful when working with fuel;
always work away from sparks or open flames.
4A-41