Mechanics

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

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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Chrisvb
December 17, 2011.




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.

Hmac300
Dec 17, 2011.
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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Tiny
Chrisvb
Dec 17, 2011.
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.

Tiny
Chrisvb
Dec 19, 2011.

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