ECU 51871694 – what to know
We offer a working MJD 6F3.G2 unit (Magneti Marelli) with part number 51871694. It controls the engine of the Fiat 1.3 Multijet. We test every unit before dispatch.
Vehicle compatibility
MJD 6F3.G2 units went into Fiat vehicles with the 1.3 Multijet engine. Compatibility is decided by the part number on the label, not just by the model and year – compare number 51871694 and marking MJD 6F3.G2 with your ECU. A different part number means a different ECU version.
What we check before dispatch
We first test ECU 51871694 on the bench and then fit it to our test car. Only a working unit is shipped. For an extra charge we carry out EGR OFF and DPF OFF. The warranty is 6 months.
Possible symptoms of a faulty ECU
- the engine does not start, no injector control,
- no communication with the ECU during diagnostics,
- no power supply to the ECU although the fuses are fine,
- failure after water ingress or a short circuit in the wiring.
These symptoms can also have other causes – wiring, power supply or sensors. Run a diagnosis before buying.
Numbers to compare with your label
The housing of the original ECU carries a sticker with its numbers. On this unit they are:
- Part number: 51871694
- ECU type: Magneti Marelli MJD 6F3.G2 / MJD6F3.G2
- Hardware version: HW04P
Virgin or IMMO OFF
- Virgin – Plug & Play: after fitting, the ECU codes itself to the car and immobiliser, no programming needed. Condition: matching part number and a working immobiliser.
- IMMO OFF on request: the car runs correctly, but a red immobiliser warning appears on the dashboard and a fault is stored in diagnostics that cannot be cleared without pairing with the immobiliser. The Virgin version does not have this fault.
Useful links
Questions and answers – ECU 51871694
How do I know that 51871694 will fit?
Check the sticker on your ECU. If it shows number 51871694 and type MJD 6F3.G2 and hardware version HW04P, it is the same version. The car model and year alone are not enough.
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Should I choose Virgin or IMMO OFF?
We recommend Virgin. IMMO OFF lets you drive, but leaves a red immobiliser warning on the dashboard and a fault in diagnostics that you cannot clear without pairing with the immobiliser.
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Do you offer EGR OFF and DPF OFF for this ECU?
Yes, these are paid extra options that we carry out on request before the ECU is shipped.
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What is the warranty on ECU 51871694?
The warranty is 6 months. Before dispatch, the ECU passes a bench test and a test in our test car.
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