Code 24 - 1987 Astro

Code 24 - 1987 Astro

Postby JooF [OP] » May 17th 2008, 6:06pm

Hey folks, I keep pulling code 24 from my CES in a 1987 Astro CS, is this VSS or IAT? Where the heck is the VSS located and what does it look like? I need to do something about this right away as it apparently has control over air fuel mixture, egr and tranny shift points... did I miention Im getting around 10 mpg? This summer after my suzuki 4x4 is finished, I will be installing a v8 and perhaps propane. Any help would be appreciated!

:confused1:
So many projects, so little time.
Original Poster [OP]
JooF
Fueling (1/8 tank)
Fueling (1/8 tank)
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Re: Code 24 - 1987 Astro

Postby Matrixx » May 18th 2008, 3:11am

Hi JooF
Code 24- Vehicle Speed Sensor. This fault should happen only when vehicle is moving. Ignore code if drive wheels are not moving. Check the TPS sensor, and check the VSS connections at the sensor back to the ecm. Verify VSS sensor is faulty with a sensor tester before condemning sensor as faulty.
VSS:
http://www.autozone.com/az/cds/en_us/09 ... oPages.htm

Emissions:
http://www.autozone.com/az/cds/en_us/09 ... oPages.htm

:)
96-GMC Safari - Rwd - Original Transmission - Exhaust - Air Cared - 3.73 Limited Slip Rear End - Motor Replaced - 91 octane (Chevron) for the last 14 years - MFI Upgrade - 640,000 Kilometers.
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Re: Code 24 - 1987 Astro

Postby JooF [OP] » May 18th 2008, 5:46am

Thanks very much for a speedy reply! :) The picture on the first link looks nothing like I have... mine is a mechanical speedo, and I cant see any wires that arnt plugged in. Could my VSS be in my speedo cluster? There is a plug further forward that seems to be plugged in towards the pan, 4 connector with 3 wires. I could take a pic of it if that helps any... Im just wonderin if someone just tossed this tranny in and avoided some sort of expensive repair b4 they sold it. Where does the wire come from and what colour are the wires?

I just bought this van, I love it to death already but this code seems to be holding hands with terrible fuel milage, so Id like to clear it all up!
So many projects, so little time.
Original Poster [OP]
JooF
Fueling (1/8 tank)
Fueling (1/8 tank)
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Re: Code 24 - 1987 Astro

Postby Matrixx » May 18th 2008, 7:17am

Hi JooF
Yes, your year is located on the back of the instrument panel. :)
96-GMC Safari - Rwd - Original Transmission - Exhaust - Air Cared - 3.73 Limited Slip Rear End - Motor Replaced - 91 octane (Chevron) for the last 14 years - MFI Upgrade - 640,000 Kilometers.
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Re: Code 24 - 1987 Astro

Postby JooF [OP] » May 18th 2008, 6:38pm

Sweet, I will check it out today!

thanks! :punk:
So many projects, so little time.
Original Poster [OP]
JooF
Fueling (1/8 tank)
Fueling (1/8 tank)
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Re: Code 24 - 1987 Astro

Postby JooF [OP] » May 18th 2008, 11:55pm

Sure enough as I dug into the dash I have found what appears to be an optical pick up right beside the speedo cable in the back of my instrument panel. The pickup has three wires, red, black, and green that end up in a pastel bluey green box that has AC on it, and 2 sets of numbers, 1567 and 25007462. The pastel box plugs into the harness via 2 connectors.

I looked inside the speedo and all that appears to be there are a set of four reflective surfaces that turn as the cable goes round... and the lil p/u that sat there looks like it has two tiny light bulbs in it. How on earth do I test this thingamabobber?
So many projects, so little time.
Original Poster [OP]
JooF
Fueling (1/8 tank)
Fueling (1/8 tank)
Years of Membership: JooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full years
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Re: Code 24 - 1987 Astro

Postby JooF [OP] » May 19th 2008, 1:55am

I read up on it... http://www.kemparts.com/TechTalk/tt04.asp led and optical pickup, the led is supposed to be lit when the ignition is turned on... mine does not do this. I probed the wires and found a ground and a 5ish Volt power source... Im figuring the led is burnt out... gonna look into replacing it at my elctrical guru friends house.

Ive read now that they are used in all sorts of different GM vehicles, but the box seems to be different colours... they also speak of 2000 and 4000 per mile variations... are they swapable between years and models?
So many projects, so little time.
Original Poster [OP]
JooF
Fueling (1/8 tank)
Fueling (1/8 tank)
Years of Membership: JooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full years
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Re: Code 24 - 1987 Astro

Postby JooF [OP] » June 9th 2008, 1:49am

Just an update... I found a VSS box at a wrecker, plugged it in and still couldnt see a light, until I looked at it through a digital camera! The old one was not showing anything in the cam, but the "new one" works! I am glad to say I have no more codes! Still runs like crap, but no codes! haha

Thanks guys
So many projects, so little time.
Original Poster [OP]
JooF
Fueling (1/8 tank)
Fueling (1/8 tank)
Years of Membership: JooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full yearsJooF has been a member for 12 full years
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