Note | The start/stop system is used for reducing fuel consumption by automatically switching off the engine when the vehicle is stationary and automatically starting it when the driver wants the vehicle to move on. The start/stop mode is automatically activated when, after moving on, the vehicle is driven for about four seconds at a minimal speed of 3 km/h. |
| Fault detection and fault display: |
| The start/stop system as a function is integrated in the engine control unit -J623- software. |
| The engine control unit -J623- features self-diagnosis to facilitate fault finding. |
| For fault finding, use the systems described in chapter „Vehicle diagnosis, testing and information system“ in „Guided Fault Finding“ mode → Chapter. |
| Battery recharging or jump start on vehicles with start/stop system: |
| Note the following when recharging or jump starting vehicles with start/stop system: using charging cables, first connect to battery positive terminal, then to body earth. This ensures that the battery sensor is not bridged. The direct charging of the battery on the negative terminal clamp means that the battery sensor is shunted and the battery data are not registered by the sensor while charging. Then, the values concerning the battery state and saved in the data bus diagnostic interface would not correspond to the values of the charged battery. |
| Replacing battery on vehicles with start/stop system: |
| When renewing the starter battery, note correct part designation in → ETKA. Starter batteries for use in vehicles with a start/stop system are marked with „AGM“ (Absorbent Glass Mat) or „EFB“ (Enhanced Flooded Battery). |
| In case of repair, note correct part number designation in ETKA. Components adapted to start/stop system are not identified separately and are not or barely different from normal components in their appearance. |
| Following components are involved in the start/stop system: |
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| Clutch pedal switch -F36- |
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| Start/stop operation switch -E693- → Chapter |
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| Coolant temperature sender -G62- |
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| Accelerator position sender -G79- |
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| Gearbox neutral position sender -G701- |
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| Control unit for ABS with EDL -J104- |
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| Climatronic control unit -J255- |
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| Control unit with display in dash panel insert -J285- → Chapter |
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| Battery monitoring control unit -J367- → Chapter |
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| Convenience system central control unit -J393- |
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| Power steering control unit -J500- |
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| Onboard supply control unit -J519- → Chapter |
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| Data bus diagnostic interface -J533- → Chapter |
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| Engine control unit. -J623- |
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| Park assist steering control unit -J791- → Chapter |
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