Engine ECU 51806506 (MJD6F3.PB) – description
On this page you can buy ECU 51806506, a Magneti Marelli MJD 6F3.PB 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.
Typical symptoms of a faulty MJD 6F3.PB 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 to compare with your label
The housing of the original ECU carries a sticker with its numbers. On this unit they are:
- Part number: 51806506
- ECU type: Magneti Marelli MJD 6F3.PB / MJD6F3.PB
- Hardware version: HW03P
Choose by part number
MJD 6F3.PB ECUs were fitted to Fiat cars 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.PB type alone. Number 51806506 on your label must match the number of this unit.
Fitting without programming
Virgin Plug & Play means that once connected, the ECU adapts itself to the car and immobiliser. Two things are needed: the same part number (51806506) and a working immobiliser.
The IMMO OFF version is available on request, but it leaves a red immobiliser warning on the dashboard and a fault in diagnostics that cannot be removed without pairing with the immobiliser. Virgin has no such fault.
Warranty and extra services
The ECU comes with a warranty of 6 months. Every unit passes a bench test and a test in our test car.
- Paid options on request: EGR OFF and DPF OFF.
If your ECU has a different part number, check 51806497 MJD 6F3.P5, 51806508 MJD 6F3.P8, 51786121 MJD 6F3.P5, 51796242 MJD 6F3.PB or the whole Fiat engine ECU category. About the manufacturer: FPT.
Frequently asked questions about ECU 51806506 MJD 6F3.PB
How do I know that 51806506 will fit?
Check the sticker on your ECU. If it shows number 51806506 and type MJD 6F3.PB and hardware version HW03P, it is the same version. The car model and year alone are not enough.
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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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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 51806506?
The warranty is 6 months. Before dispatch, the ECU passes a bench test and a test in our test car.
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