Question about 1998 Volkswagen Passat

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OBD II code P1602 on '98 VW Passat 1.8L B5

I am getting code P1602, Power Supply (B+) Terminal 30 Low Voltage. The engine is running rough, idle bounces between 600 and 1000 rpm's, rev's on its own to about 2000 rpm's and back to 600 to 1000rpm's. If I use the accelerator, it is hesitant to rev up and acts like it is trying to clear the problem if I back off of the accelerator and then re-accelerate. I have checked the voltage at the battery, the fuse block and the ECU and all three are reading 12.31 volts. All fuses are good. I am at a stand still. Any advise would be greatly appreciated.
Thank you, Chris Hansen
2chansen@lbtdsl.com

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I have a 98 passat 4cyl turbo and my oil light and now engine light is on. Took it to checkers for a diagnosis and they couldnt read the computer. Just passed emissions 4 days ago and they had to try 3 times to read the computer. What are some reasons this might be going on?

Posted on Jan 27, 2010

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I bought Innova 3130 scan tool from Schuck's but couldn't establish link with my VW Passat 98 1.8 Turbo.
What tool should I buy? Any suggestions are appreciated.

Thanks.
Ming

Posted on Jun 28, 2009

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Hi Chris,
I assume you have removed and cleaned the battery terminals and connections - and the earthing connections while you were at it?
The best way forward is to get the fault codes read using the on-board diagnostic system. You can either get this done at a suitably equipped garage or do it yourself with free "VAG diagnostic software" - (just google it), a £15 interface cable and the use of a laptop computer. This should indicate where the
fault lies. If a sensor is throwing a fault code, it could still be just a dirty electrical connector on the end of the cable, and not the sensor itself.
Once you have the list of fault codes, get them cleared, run the car for a few miles (or minutes if you don't want to go on the road) and check the codes again in case some of them were old ones that no longer apply.
If you get back to me with the list I will try to help you further.
Cheers, D.

Posted on Jul 11, 2008

  • Richard Raynor Jul 11, 2008

    By the way Chris, according to the DTC list at

    http://forums.vwvortex.com/zerothread?id...



    DTC P1602 refers to "Knock Sensor (KS) Module Performance"



    For what it is worth :-)



    If these suggestions do help you solve the problem, please give my reply a rating to help others judge my knowledge / guessing skills.
    If they do not, please hold off on the rating and add a comment with more details so I can try to help you further. Cheers, D

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