Fuel Injector Operation Inspection
WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
If simulation function of M-MDS is used:
| STEP | INSPECTION | RESULTS | ACTION |
|---|---|---|---|
| 1 | Start the engine and warm it up until normal operating temperature Connect the M-MDS to DLC-2 Select the INJ#1, INJ#2, INJ#3 and INJ#4 PIDs Turn the fuel injector from on to off using the PIDs 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 GND Is the voltage B+? |
Yes | Is the voltage B+? |
| No | Repair or replace for open or short circuit between fuel injector connector terminal A and fuel pump relay connector terminal C. | ||
| 3 | Inspect for open or short circuit between suspect fuel injector terminal B and following PCM terminals:
|
Yes | Repair or replace for open or short circuit. Go to the next step. |
| No | Go to the next step. | ||
| 4 | Inspect suspect fuel injector. (See FUEL INJECTOR INSPECTION [L5] .) Is the fuel injector normal? |
Yes | Replace the PCM (See PCM REMOVAL/INSTALLATION [L5] .) |
| No | Replace the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION [L5] .) |
If simulation function of M-MDS is used:
| STEP | INSPECTION | RESULTS | ACTION |
|---|---|---|---|
| 1 | While cranking engine, inspect for fuel injector operation sound at each cylinder using a soundscope Is operation sound heard? |
Yes | Fuel injector work properly. |
| No | Go to the next step. | ||
| 2 | Disconnect the fuel injector that the fuel injector operation sound does not heard 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 GND 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 fuel pump relay connector terminal C | ||
| 3 | Inspect for open or short circuit between suspect fuel injector terminal B and following PCM terminals:
|
Yes | Repair or replace for open or short circuit. |
| No | Go to the next step | ||
| 4 | Inspect suspect fuel injector (See FUEL INJECTOR INSPECTION [L5] .) Is the fuel injector normal? |
Yes | Replace the PCM. (See PCM REMOVAL/INSTALLATION [L5] .) |
| No | Replace the fuel injector (See FUEL INJECTOR REMOVAL/INSTALLATION [L5] .) |