| 1 | Quantity of unburnt fuel in auxiliary heater in ml (1/1000 l)| –
| The display shows the quantity of fuel calculated by the auxiliary heater control unit -J364- which was conveyed into the auxiliary heater combustion chamber by way of actuation of the metering pump -V54- without a flame being detected. |
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| The auxiliary heater is deactivated and interlocked once more than approx. 70 ml of fuel has been conveyed into the auxiliary heater combustion chamber without a flame being detected |
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| Display = 0 ... 20 ml (70 ml for certain versions, see below) |
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| If necessary, check operation of the auxiliary heater. |
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| The auxiliary heater may possibly have been activated several times in succession for brief periods and deactivated again before a flame had formed (e.g. operation as supplementary heater in a vehicle with diesel engine used for short journeys) |
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| If necessary, check operation of the auxiliary heater. |
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| If necessary, check the fuel delivery of the metering pump -V54- → Chapter and the CO 2 content of the auxiliary heater exhaust gas → Chapter |
| l
| Display = 70 ml (auxiliary heater interlocked) |
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| Depending on the version of the auxiliary heater, “70” may always be displayed in this zone. This display can be ignored if there is no fault in the auxiliary heater. |
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| Interrogate the auxiliary heater fault memory, eliminate the cause of the faults entered and cancel the auxiliary heater interlock by erasing the fault memory → Chapter |
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| Check the fuel delivery of the metering pump -V54- → Chapter and the CO 2 content of the auxiliary heater exhaust gas → Chapter |
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| Check auxiliary heater operation. |
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Note
WARNING