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The Delphi Aftermarket Team has a wealth of knowledge & can help provide guidance and advice to keep you up-to-date and on the road.

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How does C2i/C3i coding affect the repair of injectors?

When an injector is repaired, its characteristics will be significantly changed. It is therefore essential that a new C2i or C3i code is allocated to the injector to reflect the performance of the repaired injector. As the generation of the code is a complex procedure, specialist test equipment and software is required to generate these codes in the aftermarket. Only members of the authorized Delphi Common Rail repair network possess the equipment required to accurately generate C2i and C3i codes. Therefore Delphi Common Rail injector repairs should only be carried out at authorized outlets and repaired injectors should only be purchased through authorized distributors. To find your nearest authorized workshop go to our service network

How should an ECU be re-programmed?

To replace a Delphi Common Rail injector, the technician must use a diagnostic tool that is capable of writing the C2i or C3i code to the ECU. Delphi’s DS100E or DS150E with Diesel Max software is the only OE recognised tool targeted at independent garages and workshops that can provide this capability. In addition to this unique diesel capability, the simple, compact tool offers full diagnostics across other key vehicle electronic systems. With this, the technician will be able to read and erase fault codes, as well as read real time data. The DS tool with Diesel Max software is also available as part of the Delphi Service Centre – Diesel module.

What is a piezo injector?

First off we should mention the piezo-electric effect. If a bar of piezo-electric material is compressed, a potential difference is created between the two ends. If, however, the bar is stretched, a potential difference of the opposite polarity is created. The voltage measured depends on the deformation applied, the greater the deformation, the higher the voltage (in absolute values). If the situation is reversed and a voltage is applied to the two ends of the bar, the bar will expand or contract depending on the polarity of the voltage applied. In the same way as described above, the higher the voltage, the greater the deformation (in absolute values).

There are two types of piezo-electric injectors :

  • Electro-hydraulic injectors
  • Direct acting injectors

In the first case, the operating principle is identical to a solenoid type injector, but the coil is replaced by a piezo element to move the valve that controls needle lift by pressure imbalance. In the second case, the needle is directly moved by the piezo element. 

How can I accurately and efficiently test the pressure output of the diesel HP pump?

The fuel pump output pressure can be tested using the dedicated Delphi YDT 278 kit.  If the pressure is abnormal the IMV can be substituted for a calibrated dummy IMV (TDT410) and the pump can be reassessed to confirm function.