Special injectors with hydraulic servo-system and electrical triggering (solenoid valve) are used with common rail system in order to archieve efficient start of injection and precise injected fuel quantity.

The nozzle has opened by the electrical pulse, the energizing current is reduced to a lower holding value.

The Injection is terminated when the solenoid valve is no longer triggered and closes as result.

The switching on the ECM, the current profile of the injector with booster, clear, and recharge phases is the following step. Capacitor in ECM is function to charge for activating the injectors ① Capacitor discharge → ② Pull up current → ③ Charge (7A) → ④ Hold in current (12±1A) → ⑤ Charge (⑥,⑦ Hold in control current).

If the signal is below threshold value, the ECM judged this as a fault and DTC is set.

Fig 1) Normal value with injector booster operating voltage sensor at idle.

Is Current data displayed correctly ?

▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification vehicle Repair" procedure.

▶ Substitute with a known-good ECM and check for proper operation.

If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.

After a repair, it is essential to verify that the fault has been corrected.

3.

Are any DTCs present ?

Go to the applicable troubleshooting procedure.

System is performing to specification at this time.