Fiat Punto 1.2 Litre IAW 59F ECU Year 2000 Onwards

The engine control unit (ECU) for Fiat Punto 1.2 Litre vehicles manufactured between 1999-2011 is identified as the Magneti Marelli IAW 59F/5AF ECU type, positioned at the rear of the throttle housing.

One prevalent issue with this ECU is related to the ignition coil, where a failing ignition coil can generate a voltage spike, damaging the coil drivers inside the ECU. This damage results in engine misfires on two cylinders.

Diagnosis

• To diagnose ECU problems, use a diagnostic tool to identify error codes. Inspect for damage, corrosion, and loose connections in the wiring connected to the ECU. Ensure the ECU receives the correct power supply by checking the battery and alternator. Additionally, examine the ignition system, including spark plugs and the ignition coil, for proper functionality.

Solution

• Rebuilding services for this ECU type are no longer available. If the Punto engine ECU fails, replacement with a new or used unit is recommended, ensuring that part numbers match exactly. It is advisable to replace coils simultaneously to prevent further damage and premature ECU failure.

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Common Symptoms

• Misfire on two cylinders
• Illuminated engine management light (EML)

Common Fault Codes

• P0351 – Ignition Coil A Primary/Secondary Circuit Malfunction
• P0352 – Ignition Coil B Primary/Secondary Circuit Malfunction
• P0115 – Engine Coolant Temperature Sensor 1
• P0300 – Ignition Failure Generic

Affected Vehicles

• Fiat Doblo 1999-2006
• Fiat Panda 2003-2011
• Fiat Punto 1999-2011
• Fiat Seicento 1999-2011

Common Failing Part Numbers

• IAW 59F.E4 / IAW 59F.ET / IAW 59F.M1 / IAW 59F.M2 / IAW 59F.M3 / IAW 59F.M5 / IAW 59F.M7 / IAW 59F.SC / IAW 59F.SC / IAW 5AF.DE / IAW 5AF.P3 / IAW 5AF.P4 / IAW 5AF.SM / IAW 5AF.SP
• 61600.376.02 / 61600.376.03 / 61600.376.05 / 61600.389.04 / 61600.376.06 / 61600.376.07 / 61600.389.06 / 61600.444.02 / 61600.376.09 / 61600.444.03 / 61600.389.09 / 61600.444.04 / 61600.468.02 / 61600.389.10 / 61600.444.05 / 61600.468.04 / 61600.468.05 / 61600.507.03 / 61600.507.05 / 61600.507.06 / 61600.590.02 / 61600.604.04 / 61600.651.02 / 61600.651.03 / 61600.651.04 / 61601.069.02 / 61601.070.02 / 61601.071.02 / 61601.069.03 / 61601.069.04

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