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Home >> Mazda >> 2005 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine Control System BP, BP With TC) >> Engine Control System Operation Inspection >> Fuel Injector Operation Inspection
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Fuel Injector Operation Inspection

FUEL INJECTOR OPERATION INSPECTION

STEP INSPECTION ACTION
1
  • While cranking engine, inspect for fuel injector operation sound at each cylinder by using a soundscope.
  • Is operation sound heard?
 Yes Fuel injector operation is okay.
No If operation sound is not heard from all cylinders, go to Step 2.
If operation sound is not heard from some cylinders, go to Step 3.
2
  • Carry out main relay operation.
  • Is main relay operation normal?
 Yes Inspect following:
  • Fuel injector power system related wiring harnesses and connectors
  • PCM connectors
  • PCM terminal voltage
  • Fuel injector GND and related wiring harness and connectors
No Repair or replace.
3
  • Change fuel injector connector of not operating fuel injector and operating fuel injector.
  • Is operation sound heard?
 Yes Go to the next step.
No Replace the fuel injector.
4
  • Are wiring harnesses and connectors of operating fuel injector okay? (Operating or not operating)
 Yes Repair or replace.
No Inspect PCM terminal voltage for fuel injector signal.
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