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    Thread: P1548 N75 Open Circuit

    1. 07-31-2003 11:14 PM #1
      Did a search, didn't find much...so I have this dtc on an AEB ('99 Passat):
      "17956 - Boost Pressure Regulation Valve (N75): Open Circuit
      P1548 - 35-10 - - - Intermittent"
      I think I've noticed the power is not as smooth as usual. What are the likely diagnoses? Need a new N75?

    2. 04-23-2005 01:53 PM #2
      I was wondering if you got any replys to this post?

    3. 04-23-2005 01:55 PM #3
      Anybody have any clues to this code P1548 open circuit to wastegate bypass regulator?

    4. 04-23-2005 03:34 PM #4
      N75 is the wastegate solenoid valve, it runs on duty cycle and is controlled by the ECM, it is located in your intake tube between the airbox and compressor inlet, it has two vac lines to it, one to compressor side nipple and another straight to the wastegate diaphram, open circuit means there is an open circuit between the ECM and wastegate solenoid, could be a faulty solenoid, could be a problem in wiring, may not even be plugged in, hope this helps oh and since it is sporadic, or intermittent as the VAG calls it, I would venture to beleive it is a faulty solenoid valve, and if you really wanna have fun you can enter 01 engine elec, 08 read value block and try if I member correctly either blocks 115 or 116 and display 3 or 4 shows the duty cycle of the solenoid, it will be a number %

      Modified by BeitzDUB at 12:38 PM 4-23-2005

      Modified by BeitzDUB at 12:39 PM 4-23-2005

    5. 04-24-2005 02:01 PM #5
      Beitz , my vehicle is a Audi A4 Quattro 1.8T. The valve appears to operate when I energize it with a 12 volt sorce. I have my LED test light across the connector and it does flash when the solenoid is commanded on. The selonoid has about 29 Ohms and the vacuum ports appear to open and close. But yet it says I have an open? I am confused.

    6. 04-28-2005 07:23 PM #6
      Beitz, I was on the wrong solenoid. I followed the wires back from the ECU and found under the connector boot both wires were broken off the valve. I got new conectors and made the repair. Thanks again for your help.

      Modified by ka2tsm at 12:24 AM 4-29-2005

    7. 05-02-2005 02:17 PM #7

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