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#1
07-17-2010, 02:59 AM
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'86 190d tach help (inop)
Yes I searched.
My tach is inop. I was looking for two possible components. Tach amp and tach relay (with the fuse on top). I found niether, not sure which mine has, or both? The fuse panel appears to be missing a relay. Perhapse this is where the tach relay should be? Any help on the matter would be appreciated. Thanks in advance. 
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#2
07-18-2010, 12:53 AM
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The tach signal passes through a relay that is located behind the battery. Check this thread for some wiring diagrams, pictures of components, etc.
http://www.peachparts.com/shopforum/showthread.php?t=228264
__________________
 1989 250TD Wagon 5-speed, 160,000mi ::: Dark gray metallic / black cloth 1984 190D-2.2 5-speed, 287,000mi ::: Silver-blue metallic / black MB-tex ::: SOLD 
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#3
07-19-2010, 02:42 AM
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found my OVP relay, it is mounted behind a plastic cover between the firewall and the battery. Fuse was ok. Possibly looking at the engine speed sensor, a/c control relay, cluster or wiring. Is there a place I can tap in to the speed sensor to check the signal?
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#4
07-19-2010, 03:59 AM
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okay, searched lots of posts, lots of schematics. The rpm sensor signal is tapped by several components, such as the a/c control relay, cluster, diagnostic connector, but do not go through it. If I am reading the schamtic right, the rpm sensor feeds the idle speed / EGR control unit which has an rpm output (green / yellow) sent off to various components, such as diagnostic connector pin 1. This is a single wire output. I am assuming I check this to ground? pin 2.
obviously with test lead extentions, hood closed, driving, etc.
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Linear Mode
