Άρθρα Case studies

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Offshore J1939 debugging

Handyscope HS4 DIFF USB oscilloscope identifies J1939 communication problems in a Diesel engine driven firewater pump system on an offshore gas platform.

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Case studies

Citroën Berlingo with headache

After disassembling and reassembling the cylinder head of a 2011 Citroën Berlingo, the engine would not run anymore, producing camshaft related errors. Using an automotive diagnostic oscilloscope, the cause of the problem was found.

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Case studies
Camshaft, Crankshaft

Exhausted Mercedes E-class

A Mercedes E-class was hard to start, flattened the battery and left the owner stranded. The first garage is was sent to concluded that the immobilizer ECU had forgotten the key codes. The vehicle was then sent to a garage with AECS technical support and using an automotive diagnostic oscilloscope and RFS400 return flow sensor the found the real cause of the problem.

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Case studies

Kia Carens with mixture issue

A Kia Carens with 1.6 liter engine keeps generating an oxygen sensor related code that the fuel mixture was too rich. Resetting the error and driving the car would set the error code again. Several components were replaced, even the Electronic Control Module (ECM), but the error kept coming back. Diagnosing using a automotive lab scope revealed the cause of the problem.

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Case studies
MAF

Citroën Xantia refuses to run

A 1999 Citroën Xantia had a new starter motor fitted, after which it would not run anymore. While cranking it would fire briefly and then die. The car’s battery had been disconnected for the starter motor job. A crankshaft sensor code was logged and thus the crankshaft sensor was replaced, regardless of the good signal. Later the ECM was replaced all with no positive results. The question was if the immobilizer could have reset itself by disconnecting the battery. Proper measuring revealed what the real problem was.

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Case studies
Crankshaft

Ford Fiesta stutters

When trouble shooting intermittent problems, a good automotive oscilloscope is indispensable. A Ford Fiesta with J6B engine was suffering occasional stuttering. The shop it was brought to did not have an oscilloscope, so they could not easily locate the source of the problem. They did replace some components, but the problem remained. Using an automotive diagnostic oscilloscope, the problem was soon found.

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Case studies
Throttle valve

Hesitant Renault Megane

Intermittent problems in cars can give garages a hard time, especially when their only diagnosis device is a fault code scanner and no codes are stored in the car. A garage deals with a 1998 Renault Megane 1.6 L with K7M engine with a dual fuel system, both petrol and LPG. Every now and then, the engine hesitates, both on petrol and on LPG. The garage performs some measurements and replaces the ECM, to no avail. Using an automotive diagnostic oscilloscope the search was continued and the culprit was found.

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Case studies

Ford Mondeo with fuel pump issue

In modern cars with sophisticated and complex components, trouble shooting requires powerful tools. A Ford Mondeo 2.0 TDdi would no longer run. Fearing that wrong fuel was tanked, the tank was emptied and the fuel system cleaned. The proper fuel was added but the engine would still not start. Since wrong fuel was used, damage to the fuel pump was suspected. The pump was replaced, the engine replaced and the pump replaced once more, to no avail. Diagnosing using an automotive lab scope showed that a seemingly innocent component caused the problem.

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Case studies