HI , ON MY 97 VW JETTA LOST TACH , OIL LIGHT STARTED TO FLASH

  • Tiny
  • chrisvb
  • 1997 Volkswagen Jetta
  • 170,000 miles

Both issues appeared at the same time, I checked the oil pressure (at the head) at 35 lbs at 1000rpm. As it is a 1.9 IDI diesel, the tach is fed from an alternator signal at the w terminal. From others I hear that the tach and oil sending wiring may be connected.
do you have any suggestions that will narrow down the cause of the problem?

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Saturday, December 17th, 2011 AT 8:08 PM

3 Replies

  • Tiny
  • hmac300
  • Expert
  • 43,654 posts

Check your fuses and relays as the oil pressure runs through that. You may just have afuse blown. The tach is connected to theoil level sensor.

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Saturday, December 17th, 2011 AT 9:27 PM
  • Tiny
  • chrisvb
  • Member

Thanks, i'll do that. I also checked and cleaned the grounds under the batterie tray and engine ground, all fine.

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Saturday, December 17th, 2011 AT 9:45 PM
  • Tiny
  • chrisvb
  • Member

O.K., Found the problem, the w wire from alternator to the tach had a break near the starter harness. Fixed it and both tach and oil light issue resolved.

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Monday, December 19th, 2011 AT 10:44 PM

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