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Fuel Injectors & Resistors

  1. Connect tachometer to engine. Start engine and run at idle. Remove harness connector from injectors one at a time. Engine idle speed should drop 100-300 RPM as each injector is disconnected. If engine idle speed does not drop, check the wiring connector, injector resistance or injection signal from the computer.
  2. Disconnect electrical connector from each injector. Measure injector resistance. See INJECTOR RESISTANCE SPECIFICATIONS  table. If injector not to specification, replace injector.
  3. On Mazda 323, models check injector resistors. Disconnect resistor block. Measure resistance between terminal "B" and Nos. 1, 2, 3 and 4. If reading is not 6 ohms, replace resistor block.
INJECTOR RESISTANCE SPECIFICATIONS

Application Ohms
323 2-3
626 12-16
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