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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM LF 2.0L]ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF]FUEL INJECTOR OPERATION INSPECTION
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

Fuel Injector Operation Inspection

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION Fuel Injector Operation Inspection

If simulation function of M-MDS is used: 

STEP INSPECTION RESULTS ACTION
1
  • Start the engine and warm it up until normal operating temperature.
  • Select the INJ_1, INJ_2, INJ_3, and INJ_4 PIDs.
  • Turn the fuel injector from on to off using the PIDs for each cylinder.
  • Does the engine speed drop?
 Yes Fuel injector work properly.
No Go to the next step.
2
  • Disconnect the fuel injector that the engine speed does not drop at Step 1.
  • Turn the ignition switch to ON position.
  • Measure the voltage between suspect fuel injector connector terminal A (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 Yes Go to the next step.
No Repair or replace for open or short circuit between fuel injector connector terminal A and main relay connector terminal C.
3
  • Inspect for open or short circuit between suspect fuel injector terminal B and following

    PCM terminals:

    • Fuel injector No. 1
      • PCM terminal 2BB
    • Fuel injector No. 2
      • PCM terminal 2BC
    • Fuel injector No. 3
      • PCM terminal 2BD
    • Fuel injector No. 4
      • PCM terminal 2AZ

Is there any malfunction?		 Yes Repair or replace for open or short circuit.
No Go to the next step.
4 Yes Replace the PCM.
(See PCM REMOVAL/INSTALLATION [LF] ).
No Replace the fuel injector.
(See FUEL INJECTOR REMOVAL/INSTALLATION [LF] ).

If simulation function of M-MDS is not used: 

STEP INSPECTION RESULTS ACTION
1
  • While cranking the engine, inspect for fuel injector operation sound at each cylinder using a soundscope.
  • Is the operation sound heard?
 Yes Fuel injector operation is normal.
No Go to the next step.
2
  • Disconnect the fuel injector that the fuel injector operation sound does not heard at Step.
  • Turn the ignition switch to ON position.
  • Measure the voltage between suspect fuel injector connector terminal A (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 Yes Go to the next step.
No Repair or replace for open or short circuit between fuel injector connector terminal A and main relay connector terminal C.
3
  • Inspect for open or short circuit between suspect fuel injector terminal B and following PCM terminals:
    • Fuel injector No. 1
      • PCM terminal 2BB
    • Fuel injector No. 2
      • PCM terminal 2BC
    • Fuel injector No. 3
      • PCM terminal 2BD
    • Fuel injector No. 4
      • PCM terminal 2AZ

Is there any malfunction?		 Yes Repair or replace for open or short circuit.
No Go to the next step.
4 Yes Replace the PCM.
(See PCM REMOVAL/INSTALLATION [LF] ).
No Replace the fuel injector.
(See FUEL INJECTOR REMOVAL/INSTALLATION [LF] ).
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.