| Value | Healthy | What it means |
|---|---|---|
| Hydraulic pressure while drivingReading: Druk hydraulisch circuit | 38 – 51 bar | The robot changes gear and operates the clutch with this oil pressure. The pump cuts in around 39 – 40 bar and stops around 50 bar; the pressure normally swings between the two. |
| Pump speedReading: Druk hydraulisch circuit | approx. 7 bar per second (39 to 50 bar in under 2 s) | A healthy pump quickly brings the system back up to pressure. |
| Leak test (engine off, 3 minutes standing)Reading: Druk hydraulisch circuit | 0 – 1 bar per minute | The system holds its pressure while the pump is idle. Measure this with the engine off; a reading with the engine running says nothing about leakage. |
| Battery voltage while drivingReading: Accuspanning | 12.5 – 13.5 V | The voltage measured by the gearbox control unit itself. The robot is sensitive to voltage: a good battery and good earth connections are essential. |
| Battery voltage with the engine off (start/stop)Reading: Accuspanning | 12.0 – 12.2 V | A charged, healthy battery during a start/stop moment. |
| Lowest voltage when restartingReading: Accuspanning | 10.7 – 11.9 V | The voltage always dips briefly while starting. With a healthy battery the dip stays small. |
| Clutch follows its target positionReading: Slag drukschijf koppeling | on average 0.1 – 0.3 mm deviation | The control unit decides where the clutch should be and the robot follows it. A small deviation means smooth, well-working actuation. |
| Learned clutch bite pointReading: Ingeleerd sluitpunt / PIS | 1.2 8V: 17.8 – 18.0 mm (PIS approx. 6.0 mm) · 0.9 TwinAir: 21.0 – 22.0 mm (PIS 6.2 – 6.7 mm) | The point where the clutch starts to bite, learned by the control unit. It differs per engine and per gearbox control unit version; above all, follow it over time. |
| Clutch wear indexReading: Index slijtage koppeling | 2,100 – 4,600 measured (range −4,000 to +14,000; approx. 3,500 with a new clutch) | A counter for clutch wear. Compare the value over time: a fast rise means fast wear. |
| Gear positions per gearReading: Stand inschakeling / Positie selectie | each gear repeats within 0.1 – 0.6 mm; 1st and R no more than approx. 0.3 mm deeper than the other gears on the same side | The robot puts each gear in the same place every time. The absolute millimetres differ per control unit version; the differences between gears are what matter. |
| Clutch open during a gear changeReading: — (100 Hz meting) | 0.2 – 0.5 s | The time the clutch is actually disengaged while the robot selects the next gear. |
| Total shift time (upshift)Reading: — (100 Hz meting) | 0.7 – 3 s | From the engine torque being reduced until the clutch is fully closed again. The short loss of pull, most noticeable from 2nd to 3rd, is normal Dualogic behaviour. At full throttle it shifts faster; if you lift off during the shift it closes more gently. |
| Engine speed flare during a shiftReading: — (100 Hz meting) | 0 – 70 rpm, occasionally up to approx. 150 rpm under high load | How much the engine revs up while the clutch is open. A small value means the control unit reduces engine torque properly. |
| Engaging reverseReading: — (100 Hz meting) | 0.26 – 0.40 s, input shaft stationary | When R is selected the clutch opens fully and the control unit first brakes the input shaft (via 1st gear) so reverse engages without grinding. |
| Fault codesReading: Storingen versnellingsbak | no active fault codes | Codes with the status "test not completed" are not faults. |
Measured by RvR Automotive on healthy Fiat 500 Dualogic cars (1.2 8V and 0.9 TwinAir), November 2026. Names as shown in MultiECUScan.
Important when comparing
- Don’t judge shift quality from the MultiECUScan graph. It only samples about once per second, so it catches normal moments of a gear change that look like slipping or flaring. The shift times above were measured at 100 samples per second.
- Millimetres differ per version. There are several versions of the gearbox control unit (CFC 328F.05, .12, .17, .18); absolute positions can differ by a few millimetres without anything being wrong.
- Follow values over time. A learned bite point or wear index tells you most when you read it again after a few months and compare.
- Measure under the right conditions: the leak test with the engine off, shift measurements with a warm engine and a normal drive through all gears.
Do your values differ?
A different value is not a diagnosis yet. Feel free to get in touch or make an appointment: we measure your car in the same way and tell you exactly what is going on.
Frequently asked questions
What pressure is normal for the Fiat 500 Dualogic?
While driving the hydraulic pressure normally swings between about 38 and 51 bar: the pump cuts in around 39 – 40 bar and stops around 50 bar.
How much pressure loss is normal?
With the engine off and the car standing, the healthy cars in our measurements lost 0 to 1 bar per minute.
How long does a normal gear change take?
The clutch is open for 0.2 to 0.5 seconds; the whole change including reducing and restoring engine torque takes 0.7 to 3 seconds.
