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Home >> Mazda >> 2005 >> MPV ES >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting (Engine Control System) AJ >> 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 using a soundscope.
  • Is operation sound heard?
 Yes Fuel injector operation is okay.
No All cylinders not heard: 
  • Go to next step.

Some cylinders not heard: 
  • Go to step 3.
2
  • Carry out main relay operation inspection.
  • Is main relay operation normal?
 Yes Inspect following.
  • Fuel injector power system related wiring harness and connectors
  • PCM connectors
  • Fuel injector GND and related wiring harness and connectors
No Repair or replace malfunctioning part.
3
  • Change fuel injector connector of not operating fuel injector and operating fuel injector.
  • Is operation sound heard?
 Yes Go to next step.
No Replace fuel injector.
4
  • Are wiring harness and connectors of not operating fuel injector okay? (Open or short circuit)
 Yes Inspect PCM terminal voltage of fuel injector signal.
No Repair or replace malfunctioning part.
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