Note | More information about this topic can be found in → No.138. |
| 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. |
| To localise faults, refer to chapter entitled „Vehicle diagnosis, testing and information system“ and use „Guided fault finding“ function. |
| Battery recharging or jump start on vehicles with start/stop system: |
| When recharging the battery or jump starting vehicles with start / stop system, note the following: Using the charging cable, first connect the positive terminal and then connect to the earth of the vehicle. This ensures that the battery sensor is not shunted. 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. |
| Renewing battery on vehicles with start/stop system: |
| Because of its higher deep-cycle resistance, only an absorbent glass mat battery is used as a starter battery instead of the normal lead battery in vehicles with start/stop system. |
| 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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| Voltage regulator: -C1- |
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| Checking 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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| ABS with EDL control unit -J104- |
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| Climatronic control unit -J255- |
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| Control unit with indication unit in instrument panel -J285- |
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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- |
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| Data bus diagnostic interface -J533- |
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| Engine control unit -J623- |
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| Park assist steering control unit -J791- |
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