Engine ECU 51806505 (MJD6F3.P5) – description
On this page you can buy ECU 51806505, a Magneti Marelli MJD 6F3.P5 unit intended for the Fiat 1.3 Multijet. It goes through a function test before dispatch. The housing has been refurbished – the electronics have not been repaired.
How to check compatibility
MJD 6F3.P5 ECUs were fitted to Fiat cars with the 1.3 Multijet engine. The safest way is to compare labels: part number 51806505 and marking MJD 6F3.P5 must be the same as on your ECU. If the number differs, it is a different version – look for your number in the category or ask us.
Coding to the immobiliser
- Virgin: the ECU codes itself after fitting – no programming, with a matching part number and a working immobiliser.
- IMMO OFF (on request): the car drives, but a red immobiliser warning is shown on the dashboard and a fault stays in diagnostics that cannot be cleared without pairing with the immobiliser.
- We recommend Virgin, as it leaves no fault.
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.
Typical symptoms of a faulty MJD 6F3.P5 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.
Numbers on the label
- Part number: 51806505
- ECU type: Magneti Marelli MJD 6F3.P5 / MJD6F3.P5
- Hardware version: HW03P
Looking for a different number? See also: 51781564 MJD 6F3.P7, 51862574 MJD 6F3.G1, 51829540 MJD 6F3.B1, 51862582 MJD 6F3.D6. The full range is in the Fiat engine ECU category, and the FPT page tells you more about the manufacturer.
Questions and answers – ECU 51806505
Is it enough to just fit ECU 51806505?
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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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 51806505?
The warranty is 6 months. Before dispatch, the ECU passes a bench test and a test in our test car.
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