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. Access the INJ#1, INJ#2, INJ#3 and INJ#4 PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) 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. Switch the ignition to ON. Measure the voltage between suspect fuel injector terminal B (wiring harness-side) and body ground. Is the voltage B+ ? |
Yes | Go to the next step. |
| No | Repair or replace for a possible open or short circuit. | ||
| 3 | Inspect for open or short circuit in wiring harness between suspect fuel injector terminal A and following PCM terminals:
|
Yes | Repair or replace for a possible open or short circuit. |
| No | Go to the next step. | ||
| 4 | Inspect suspect fuel injector. (See FUEL INJECTOR INSPECTION .) Is there any malfunction? |
Yes | Replace the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION .) |
| No | Replace the PCM. (See PCM REMOVAL/INSTALLATION .) |
If simulation function of M-MDS is not 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 engine speed does not drop at Step 1. Switch the ignition to ON. Measure the voltage between suspect fuel injector terminal B (wiring harness-side) and body ground. Is the voltage B+ ? |
Yes | Go to the next step. |
| No | Repair or replace for a possible open or short circuit. | ||
| 3 | Inspect for open or short circuit in wiring harness between suspect fuel injector terminal A and following PCM terminals:
|
Yes | Repair or replace for a possible open or short circuit. |
| No | Go to the next step. | ||
| 4 | Inspect suspect fuel injector. (See FUEL INJECTOR INSPECTION .) Is there any malfunction? |
Yes | Replace the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION .) |
| No | Replace the PCM. (See PCM REMOVAL/INSTALLATION .) |