Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSMART2012FORTWO ELECTRIC DRIVE, 2D COUPEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALCOMPLETE ENGINE - 451 CHASSISTESTING & REPAIRTEST COMPRESSION PRESSURE - AR01.00-P-1200MCU
2012 Smart Fortwo Electric Drive, 2D Coupe
Test compression pressure - AR01.00-P-1200MCU
2012 Smart Fortwo Electric Drive, 2D CoupeSECTION Test compression pressure - AR01.00-P-1200MCU
ENGINE 132.910 in MODEL 451.3/4
| Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | AS00.00-Z-0005-01A | |
| Remove/install | |||
| 1 | Bring engine up to operating temperature of approx. 80°C | ||
| 2 | Switch off ignition | ||
| 3 | Remove spark plugs | ||
| AP15.10-P-1580MCC | |||
| Check | |||
| 4 | Route electrical line (2) for compression recorder (1) between air filter housing (3) and throttle valve actuator (M16/6) to the starter (M1) | Fig 2 | |
| Risk of death caused by vehicle slipping or toppling off of the lifting platform. | Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer. | AS00.00-Z-0010-01A | |
| 5 | Raise vehicle with vehicle lift | ||
| 6 | Detach connector (4) from starter (M1) | ||
| 7 | Attach terminals (5, 6) of compression recorder (1) to the starter (M1) | ||
| 8 | Lower vehicle with vehicle lift | ||
| 9 | Turn engine using contact switch on compression recorder (1) for about 5 seconds | ||
| 10 | Insert compression recorder (1) with appropriate connector into spark plug bore | ||
| 11 | Crank engine with contact switch at the compression recorder (1) until an increase in pressure is no longer indicated on the compression recorder (1) | ||
| 12 | Carry out test procedure at remaining cylinders in the same way | ||
| 13 | Compare measurements obtained with the permissible values | Compression pressure new value | *BE01.00-P-1001-01G |
| Compression pressure: wear limit or limit value If the wear limit is not reached, cylinder leakage must be checked on the respective cylinder: | *BE01.00-P-1002-01G | ||
| ↓ Check cylinders for leaks |
AR01.00-P-1300MCU | ||
| 14 | Install in the reverse order | ||
| 15 | Read out fault memory using the diagnostic system and delete | ||
| AD00.00-P-2000-04MCC |
CHECK VALUES FOR COMPRESSION PRESSURE
| Number | Designation | ENGINE 132.910 | |
|---|---|---|---|
| BE01.00-P-1001-01G | Compression pressure new value | bar | 15 |
CHECK VALUES FOR COMPRESSION PRESSURE
| Number | Designation | ENGINE 132.910 | |
|---|---|---|---|
| BE01.00-P-1002-01G | Compression pressure: wear limit or limit value | bar | ≈ 11 |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.