Announcement

Collapse
No announcement yet.

Dead tach and temp gauge.......

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Dead tach and temp gauge.......

    After replacing the head on the car the tach and temp gauge quit working. I
    replaced the coolant sensors during the process. A hint from John on another
    board noted that if the reverse light wires were shorted out this would
    cause such a gremlin. Pulled the shifter boot off, unplugged the connector
    and sure enough the car side (not switch side) was shorted out together?
    Went to the back of the car, removed the light bulbs and the short goes
    away? Cool I though, the tach and temp gauge should work now.....nope.
    Pulled out the ETM and started tracking it. Found that pin #7 of C2 on the
    back of the instrument cluster is the tach input. I put the DVM on this wire
    and can see the pulsing input so I assume that the signal is reaching this
    far.

    Where do I go from here?

    Tony

  • #2
    Check for blown fuse. This was the case for me since I always overlook the easy stuff.


    Disclaimer: Remember, I know absolutely nothing, but it doesn't prevent me from having an opinion or suggestion. :

    Comment


    • #3
      The fuses are all good.

      T

      Comment


      • #4
        my tach isn't working and i think it may be the s.i. board.

        Comment


        • #5
          The batteries were dead. Went to RadShack and got some 700mah NiCad AA's and all is good. I guess having the battery unhooked for more than two weeks killed them.

          T

          Comment


          • #6
            I've got the same problem after changing my interior carpet with instruments unplugged for 2 weeks. Sometimes coolant guage works but tach always does not work. Interestingly, the oil temp guage works. Is it difficult to change the ni-cad batteries? I checked my fuses (they are OK). Any other suggestions???

            TIA
            Joe
            2000 Porsche Boxster S - Daily Driver
            1995 Porsche 993
            2001 BMW 530iA Sport (hers)
            2004 Ford F-150 FX4
            2005 KTM 450EXC (More fun than all of the above)

            Gone:

            1988 BMW M3 2.5 EVOIII Replica
            1985 BMW M635CSI
            2001 BMW M3
            1988 BMW 325is (E30 M3 springs, steering, Konis, etc) - my favorite BMW - missed.

            Comment


            • #7
              One more thing: two of the red inspection lights stay on even after I turn the car off. What does that mean??
              2000 Porsche Boxster S - Daily Driver
              1995 Porsche 993
              2001 BMW 530iA Sport (hers)
              2004 Ford F-150 FX4
              2005 KTM 450EXC (More fun than all of the above)

              Gone:

              1988 BMW M3 2.5 EVOIII Replica
              1985 BMW M635CSI
              2001 BMW M3
              1988 BMW 325is (E30 M3 springs, steering, Konis, etc) - my favorite BMW - missed.

              Comment


              • #8
                The oil temp gauge works on it's own circuit while the Tach and Coolant gauge are run through the SI board. BTW, there should be 5 green, 1 yellow and 1 red LED on all E30's 86-on including all M3's, yet you say you have 2 red LED's that are staying on? Anyway, sounds like you have an SI board problem, Jmarch and replacing the batteries may or may not fix the problem but you should try it first.

                88 M3 - LACHSSILBER/M TECH
                89 M3 - ALPINEWEISS II/SCHWARZ
                85 323I S52 - ALPINEWEISS/SCHWARZ
                91 M TECHNIC TURBO - MACAOBLAU/M TECH


                Comment


                • #9
                  Thanks Barry, I'll give it a shot
                  2000 Porsche Boxster S - Daily Driver
                  1995 Porsche 993
                  2001 BMW 530iA Sport (hers)
                  2004 Ford F-150 FX4
                  2005 KTM 450EXC (More fun than all of the above)

                  Gone:

                  1988 BMW M3 2.5 EVOIII Replica
                  1985 BMW M635CSI
                  2001 BMW M3
                  1988 BMW 325is (E30 M3 springs, steering, Konis, etc) - my favorite BMW - missed.

                  Comment

                  Working...
                  X