On the above mentioned vehicles the engine may misfire resulting in the "jerking" of the engine.
During this process the engine control lamp illuminates in the majority of cases and an error rate is saved in the control unit (misfiring).
The code P0301 signifies e.g. "Misfiring, cylinder 1".
If the compression, spark plugs and ignition coils have been checked and found to be in order, the problem may be caused by a faulty pin on the wiring harness connector for the engine control unit. The operation of the ignition coils can be checked, e.g. using an oscilloscope. If there is no signal here, the electrical wires can be checked for continuity with the aid of a multimeter.
In the case that a pin has broken off in the connector to the engine control unit, the vehicle manufacturer offers a repair cable with pin.
Important safety notice
The following technical information and tips for practical use have been set up by HELLA in order to offer professional support to automotive workshops in their daily work. The information available here on this website is only to be used by appropriately trained specialist staff.
The reprinting, distribution, reproduction, exploitation in any form and disclosure of the contents of this document, even in part, is prohibited without our express written approval and indication of the source. The schematic illustrations, figures and descriptions are for explanation and presentation of the document text and cannot be used as a basis for installation or design. All rights reserved.
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