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Bernd-993
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Everything posted by Bernd-993
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Hello 'Contributor', thanks for the quick reply! Yes, the car is a US model reimport from New Jersey to Bremerhaven in 2007 and was running good in the last couple of years. The only annoying thing was the CEL for different reasons, VarioCam, Camshaft sensor up to a bad sealing tank cap. The camshaft sensor was replaced a couple of weeks ago bcause of P0341 error code. Now, a P0343 is still active. I tested the wiring of both sensors, 5V ok, ground ok, the resistance of the signal cable is ~0Ohm. When I pull the connector from the Hall sensor I measure B+ at pin 2 that is connected with pin III/20 of the DME while ignition is on. The same situation holds for bank 2 sensor that is connected to III/19, shows also 12V. It is very unlikely that there is a shortage to B+ but I plan further tests on the weekend. It would be of interest whether the DME unit is faulty? I used a notebook based Porsche tester from a workshop nearby that seems reliable. I cannot read the camshaft deviation since the sensor signal is not plausible. Wrong timing of bank 1 may be a possible issue to receive an implausible camshaft sensor signal. When the VarioCam actuator was repaired the cam stting was carefully set with a Porsche special tool.
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after repairing the VarioCam on bank 1 (engine M96-04) and replacing the camshaft position sensor I still receive P0343. I checked the wiring and voltages. When I draw the connector and ignition is on I receive 5V / 12V / 0V on the sensor connector. This is the situation on bank 1 and bank 2. It looks like the 12V=B+ comes from the DME at iii/20 and iii/19 vs ground. This voltage seems to feed a 20mA circuit inside the camshaft position sensors. When I look at the scope picture provided in the Porsche diagnosis manual the signal level with running engine is jumping between ~13V and zero. Therefore, I don't understand the testing procedure for P0343, Check signal wire from DME control module, pin III/20, to CMP sensor for short circuit to B+. 1. Connect special tool 9637 to wiring harness (DME control module connector). 2. Remove connector of CMP sensor. 3. Connect voltmeter to special tool 9637, pin III/20, and ground. Switch on the ignition. Display: 0 V If battery voltage is displayed, check wiring harness for chafing and pinching damage. The voltage should read 0V but the DME in my car provides 12V for both pins III/20 and III/19! I measure directly at the cable connected to the DME and don't have a breakout box. P0343 indicates that only bank 1 sensor circuit is above limit. What is wrong here? I need to fix the error since I my 996C4(2001) will fail the German TUV.