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On my 97 VW Jetta lost tach, oil light started to flash

Tiny
CHRISVB
  • MEMBER
  • 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
  • MECHANIC
  • 48,601 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
  • 6 POSTS
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
  • 6 POSTS
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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