My next question is, “What is causing this problem? Is it the ignition coil itself? Is it an input to the PCM or is it the PCM that is causing the destruction of the ignition coils?" Something has caused the coil on time to suddenly increase to the point that would overheat an ignition coil. In Figure 1, the waveform shows a problem with the ignition coil current. At this point, I have my first test results to find a direction. The engine was started and allowed to run until it stalled. I also hooked a voltage probe to the CKP and CMP sensors. One current probe went to the ignition coil power feed while the second went to the No. My first question was, “What is going away, spark or fuel? To answer this question, I used two current probes and my lab scope.
#How to build a ignition coil driver code#
This engine will run with the CMP sensor unplugged, so the P0341 code is not an issue with the stalling problem. At times, the codes must be cleared before the engine will restart. My gut feeling is the P0102 code is set by the engine not breathing properly.Ĭlearing the codes, starting the engine, and running a few seconds until it will stall will cause both codes to come back. The P0341 code is set by the CMP, and the CKP signal correlation being wrong. There are a few codes stored in the ABS module and two codes stored in the PCM.Ĭode P0341 (Camshaft Position Sensor circuit range/performance) and P0102 (MAF flow too low). A scan tool was hooked up, and all modules scanned for any clues that might have been stored in memory. On any problem like this, my first step is to always take a look at anything stored in the computer’s memory. Each time the running time would get shorter until it would not run at all. The engine could be restarted, and it would run and then stall again. It would run about 15 minutes and then stall. With the Cabrio at my shop, I found the engine could be started. Any time I hear something like this, my mind always wonders if the problem is really an ignition coil or is the defective ignition coil a product of something else that is causing the ignition coil to fail? Let's take a look At this point, the car was brought to my shop to be fixed.Įach time the engine stalled, the problem has been the ignition coil quit making spark and installing a new ignition coil got the engine running again.
This repair also lasted about 2 weeks, then the stalling problem reoccurred. A new OE coil from the dealer was installed. The car was taken back to the shop where they found the ignition coil had failed yet again. The vehicle was driven for two weeks and stalled again. 2, they replaced the ignition coil, put in a used ECM, installed a new distributor and put on a new MAF. The vehicle was hauled back to the European shop, only to find the shop had closed its doors so the vehicle was hauled to another shop for the needed repairs. The engine started and ran okay and was driven about two weeks before the engine stalled again. The shop found the problem was caused by a bad ignition coil, so a new coil was installed. The car was loaded on a flatbed and hauled to a shop that specialized in VW, Mercedes Benz and Volvo vehicles. She was 50 miles from home when the engine lost power and died. The lady owner was on her way home from work on Friday evening.
The story of the problem started out about six months earlier. While I had this car apart, the lady owner walked into the shop and loudly exclaimed, “MY BABY.” I think she had a love affair with this car. You might think a car this old would be a car that nobody would invest any money in, but please keep in mind, beauty is in the eye of the beholder, and when a person loves their car, takes great care of it, and keeps up on the maintenance, the vehicle will last a long time. This 2001 VW Cabrio was one of those vehicles. Many of these problem vehicles come from other shops and many of the vehicles have been backed up to the parts store and loaded up with everything in sight. Some of the information may no longer be relevant, so please use it at your discretion.Įvery now and then an interesting diagnostic problem comes into the shop. This article was originally published Aug.
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