Injector; Injector Resistance - Mazda MX-5 1990 Workshop Manual

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05UOFX-167
05UOFX-169
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05UOFX-170
05UOFX-171
F-112
FUEL SYSTEM
Replacement
Warning
• Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page
F-l0l.)
• When replacing fuel system components, keep
sparks, cigarettes, and open flames away from the
fuel.
1. Disconnect the vacuum hose.
2. Disconnect the fuel return hose.
3. Remove the pressure regulator.
Tightening torque:
7.8-11 N·m (80-110 em-kg, 69-95 in-Ib)
4. Use new O-ring.
5. Install in the reverse order of removal.
INJECTOR
Caution
• Obtain the code number and deactivate the audio
anti-theft system before disconnecting the battery. --,
(Refer to page T -113.)
Inspection
Operation check
1. Warm up the engine and run it at idle.
2. Listen for operational sound of the injector with a screwdriver
or a sound scope.
3. If no sound is heard, measure injector resistance.
4. If the injector resistance is OK, check wiring to the injector
and engine control unit terminals 2A, 2U, and 2V voltages.
(Refer to page F-130.)
Injector resistance
1 . Disconnect the injector harness.
2. Measure resistance of the injector with an ohmmeter.
Resistance: 12-160
3. If not as specified, replace the injector.
Removal
Warning
• Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-l0l.)
• When servicing the fuel system parts, keep sparks,
cigarettes, and open flames away from the fuel.