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Kyle C
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CASIS doesn't work
This may seem trivial, but the shift indicator on my tach doesn't work 100% of the time. I have only seen it work 3 times for only a few minutes since I bought the car a year ago. I have gone through the WSM procedures for diagnosis. Since the coolant temp gauge, speedo and tach all work, I am assuming that those signals are getting to the cluster just fine (and speedo and temp signals should therefore make it to the tach's internal computer). I tested for the presence of the injection timing signal at the cluster and it is present. There is continuity present on this wire all the way to the tach's computer circuit board. I know it's not important for it to work, but if possible I would like to fix it. At night (way too dim to see during day) I noticed that the upshift indicator arrow lights up with the key in pos II and stays lit until the key is turned off. I am not sure if the tach does a bulb check during power-on or not, or if the internal computer is junk. Any suggestion? I will not be replacing the tach if the computer is bad.
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1974 911 1978 928 5spd hillclimb special 1984 928S 5spd, 1986.5 928S auto 1983 944, 1984 944 track car 1995 Saab 900 S, 1997 Saab 900 Turbo, 1999 Saab 9-3 S |
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10-21-2010, 06:56 PM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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so what is a SISAC?
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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10-22-2010, 05:40 AM
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Kyle C
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I believe it stands for Computer Aided/assisted/automated Shift Indicator System (according to the car's owners manual). Just a fancy name for the upshift light in the dash.
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1974 911 1978 928 5spd hillclimb special 1984 928S 5spd, 1986.5 928S auto 1983 944, 1984 944 track car 1995 Saab 900 S, 1997 Saab 900 Turbo, 1999 Saab 9-3 S |
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10-22-2010, 08:17 AM
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Moderator
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Wow, the acronym doesn't even match the definition. Well, unless your dyslexic.
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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10-22-2010, 10:39 AM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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Oh i thought it was a System Indicator Shift Assist Computer
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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10-22-2010, 01:20 PM
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Moderator
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Didn't you just ask what it stood for a couple posts up?
Anyways, I think it's Speed Is So Awesomely Cool
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
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10-22-2010, 01:33 PM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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no, I read the OP`s question in a mirror
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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10-22-2010, 03:23 PM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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Check the 14 pin connector above the hot post for corrosion, and the speedometer connections in the tire well
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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10-22-2010, 03:24 PM
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Kyle C
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speedo works, so I should be getting that signal to the tach. I will recheck the 14 pin connector though. Has anyone ever been able to diagnose/fix the tach internals?
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1974 911 1978 928 5spd hillclimb special 1984 928S 5spd, 1986.5 928S auto 1983 944, 1984 944 track car 1995 Saab 900 S, 1997 Saab 900 Turbo, 1999 Saab 9-3 S |
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10-22-2010, 04:43 PM
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Registered User
Join Date: Aug 2010
Posts: 49
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Hi
 WHAT upshift light ??? Is this something that American 928s got that Euros didnt ? My tach has no shift up lights ??? All the best Brett
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PORSCHE 928 S2 AUTO V8 4.7 LTR 1986 IRIS METALLIC BLUE WITH X-PIPES, RMB, JOHN SPEAKE CHIPS, KICKDOWN SWITCH, K&N, WIZARDS OF NOS - PRO RACE NITROUS KIT 2000 HP CAPABLE SYSTEM. EX - PCGB UK 928 FORUM MODERATOR. EMAIL managingdirector@pchealthcare.co.uk |
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10-22-2010, 04:49 PM
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Kyle C
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Yes, it is only available in US cars with 5spd transmission
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1974 911 1978 928 5spd hillclimb special 1984 928S 5spd, 1986.5 928S auto 1983 944, 1984 944 track car 1995 Saab 900 S, 1997 Saab 900 Turbo, 1999 Saab 9-3 S |
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10-22-2010, 05:12 PM
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Registered User
Join Date: Aug 2010
Posts: 49
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Quote:
Wow I never knew that lol Thanks very much as its rare I learn something new about 928s ... All the best Brett
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PORSCHE 928 S2 AUTO V8 4.7 LTR 1986 IRIS METALLIC BLUE WITH X-PIPES, RMB, JOHN SPEAKE CHIPS, KICKDOWN SWITCH, K&N, WIZARDS OF NOS - PRO RACE NITROUS KIT 2000 HP CAPABLE SYSTEM. EX - PCGB UK 928 FORUM MODERATOR. EMAIL managingdirector@pchealthcare.co.uk |
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10-22-2010, 05:25 PM
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