ECU 51847818 – what to know
We offer a working MJD 6F3.H2 unit (Magneti Marelli) with part number 51847818. It controls the engine of the Fiat 1.3 Multijet. We test every unit before dispatch. The housing has been refurbished – the electronics have not been repaired.
Tests, options and warranty
- Every ECU is tested on the bench and fitted to our test car before dispatch.
- Paid extra options: EGR OFF and DPF OFF.
- Warranty: 6 months.
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: 51847818
- ECU type: Magneti Marelli MJD 6F3.H2 / MJD6F3.H2
- Hardware version: HW04P
Typical symptoms of a faulty MJD 6F3.H2 ECU
A damaged ECU can stop the engine from starting because the injectors receive no signal. The tester then cannot connect to the unit, and a measurement may show no power at the ECU despite good fuses. The failure can follow water ingress or a short circuit in the wiring.
The same symptoms can, however, come from a fault in the harness, power supply or sensors, so run a diagnosis before buying.
Virgin version – no programming
We ship ECU 51847818 as Virgin. After fitting, it codes itself to the car and immobiliser – no programming is needed, as long as the part number matches and the immobiliser works.
On request we prepare an IMMO OFF version. The car will drive, but a red immobiliser warning stays on the dashboard and a fault remains in diagnostics that you cannot clear without pairing with the immobiliser. That is why we recommend Virgin.
Choose by part number
MJD 6F3.H2 units went into Fiat vehicles with the 1.3 Multijet engine. We match these ECUs by part number only, because the version is decided by the number, not by the MJD 6F3.H2 type alone. Number 51847818 on your label must match the number of this unit.
More units in the Fiat engine ECU category and on the FPT manufacturer page.
Similar numbers from this family: 51826696 MJD 6F3.PB, 51854482 MJD 6F3.J2, 51862586 MJD 6F3.H1, 51818295 MJD 6F3.B1.
Questions and answers – ECU 51847818
How do I know that 51847818 will fit?
Check the sticker on your ECU. If it shows number 51847818 and type MJD 6F3.H2 and hardware version HW04P, it is the same version. The car model and year alone are not enough.
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Is it enough to just fit ECU 51847818?
Yes, if the part number matches and the immobiliser works. After fitting, the Virgin version codes itself to the car and immobiliser, with no programming.
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What is the difference between IMMO OFF and Virgin?
With IMMO OFF the car runs, but a red immobiliser warning stays on the dashboard and a fault remains in diagnostics that cannot be cleared. The Virgin version does not have this fault, which is why we recommend it.
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How do you test ECU 51847818?
We check every unit on the bench and then fit it to our test car. The warranty is 6 months.
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