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digital speedometer quit working


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mrmajestyk
User

Jan 30, 2015, 7:02 AM

Post #1 of 14 (1525 views)
post icon digital speedometer quit working Sign In

1990
Chrysler
New Yorker Landau
3.3 V-6
This car has digital gauges and speedo. The speedometer stopped working and so did the odometer.The speedo always reads zero and the odometer does not move. The last time I parked it, everything was working fine, the next day these things started. When I start the car, all the gauges and speedometer cycle like they should. Any ideas greatly appreciated.


Discretesignals
Ultimate Carjunky / Moderator
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Jan 30, 2015, 9:48 AM

Post #2 of 14 (1507 views)
Re: digital speedometer quit working Sign In

VSS related trouble code stored in the engine computer?





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mrmajestyk
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Jan 30, 2015, 4:15 PM

Post #3 of 14 (1497 views)
Re: digital speedometer quit working Sign In

I have not checked for that yet.


Discretesignals
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Jan 30, 2015, 5:18 PM

Post #4 of 14 (1492 views)
Re: digital speedometer quit working Sign In

Do the key dance and see if there are flash codes stored.

https://www.youtube.com/watch?v=PKLTzmmJuGs





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mrmajestyk
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Jan 30, 2015, 9:36 PM

Post #5 of 14 (1484 views)
Re: digital speedometer quit working Sign In

ok, I did the key dance and got codes 14 and 15. Would one of these be the culprit?


Discretesignals
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Jan 31, 2015, 5:47 AM

Post #6 of 14 (1476 views)
Re: digital speedometer quit working Sign In

Unfortunately, no. Those codes deal with the ABS system.

This is where it starts getting more complicated.

Perform a cluster diagnostic check:

With the key off, press and hold the trip and trip/reset buttons at the same time. Turn the key on. The cluster should display "check". Press the US/metric switch. The cluster will then display trouble codes, if any, followed by a 999. 999 means end of codes. If there are no codes, 999 will be displayed only.





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(This post was edited by Discretesignals on Jan 31, 2015, 5:51 AM)


mrmajestyk
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Jan 31, 2015, 6:34 AM

Post #7 of 14 (1471 views)
Re: digital speedometer quit working Sign In

ok, just to double check the key dance, I did it again and this time it showed codes 15 and 35. I tried pushing trip and trip/reset together and turning the key on but "check" did not come on, just the normal display. The us/metric button had no effect.


mrmajestyk
User

Jan 31, 2015, 6:39 AM

Post #8 of 14 (1469 views)
Re: digital speedometer quit working Sign In

sorry, that was codes 15 and 34, not 15 and 35.


Discretesignals
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Jan 31, 2015, 1:28 PM

Post #9 of 14 (1462 views)
Re: digital speedometer quit working Sign In

I was re reading the code charts and it really doesn't list the number for the engine computer codes. They all concern ABS.

I went to a different source and the 15 code is vehicle speed sensor circuit and the 34 has to do with a fault in the cruise control system.

If the engine computer isn't getting the signal from the distance sensor that might explain why your speedo is inop. To determine what the fault is, you would have to see if the signal from the sensor is reaching the engine computer. It could be a problem with the sensor, something mechanical that drives the sensor, a wiring issue, or the engine computer itself( unlikely).

The sensor is located in the extension housing of the transaxle. You should first do a visual inspection of the sensor, connectors, and wiring. Make sure the terminals inside the connector aren't spread out.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jan 31, 2015, 1:37 PM)


mrmajestyk
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Jan 31, 2015, 3:17 PM

Post #10 of 14 (1456 views)
Re: digital speedometer quit working Sign In

I was looking for a replacement sensor and saw two different types, one is a input sensor and one is a output. Which one would I get?
Thank you for all your help.


Discretesignals
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Jan 31, 2015, 5:00 PM

Post #11 of 14 (1451 views)
Re: digital speedometer quit working Sign In

Neither. The input and output speed sensors are used by the transmission control unit and are used to determine gear ratio.

The distance sensor is used by the ECM and has white/orange and black/light blue wires on its connector.




Are you going to troubleshoot or gamble and replace the sensor?







Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jan 31, 2015, 5:03 PM)


mrmajestyk
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Jan 31, 2015, 5:26 PM

Post #12 of 14 (1446 views)
Re: digital speedometer quit working Sign In

I'll check the connections and wiring and anything else that seems out of place first but will probably wind up buying a sensor if I can't find anything. Thank you again for all of your help.


Discretesignals
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Jan 31, 2015, 5:41 PM

Post #13 of 14 (1442 views)
Re: digital speedometer quit working Sign In

If the wiring and connector looks good, there is another test you can do. Usually, you are supposed to use the DRB or high end scan tool to look at the VSS info, but you may be able to use the speedo.

One wire on the speed connector should have 4 or 5 volts. The sensor is a reed switch with 8 magnetic poles. Every time a magnet gets close enough the reed switch closes. When it is closed the 4 or 5 volts is pulled to ground. This creates a digital signal the engine computer uses to determine vehicle speed. You can act as the reed switch and use a piece of wire to bridge the two terminals in the connector together. You want to tap ( quickly) on one terminal while keeping the piece of wire on the other terminal, like your doing Morse code. What your doing is simulating the digital signal the sensor would generate. Someone else in the vehicle should see some sort of reaction of the speedometer when you do that with the ignition on.

If you see a reaction from the speedo, that means the wiring, ECM, and instrument cluster are good.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jan 31, 2015, 8:25 PM)


Discretesignals
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Jan 31, 2015, 8:30 PM

Post #14 of 14 (1433 views)
Re: digital speedometer quit working Sign In

Here's some other information that might be considered:


Quote
91chrysler07

NO.: 08-10-91

GROUP: ELECTRICAL

DATE: Sept. 9, 1991


SUBJECT: Speedometer Reading Fluctuates and/or Speed Control Disengages


MODELS:

1989-91 (AA) ACCLAIM/SPIRIT/LEBARON SEDAN
(AB) RAM VAN/WAGON (RWD)
(AC) DYNASTY/NEW YORKER SALON
(AD) RAM PICKUP/RAM CAB & CHASSIS/RAMCHARGER
(AG) DAYTONA
(AJ) LEBARON COUPE/LEBARON CONVERTIBLE
(AN) DAKOTA PICKUP
(AP) SUNDANCE/SHADOW/SHADOW CONVERTIBLE
(AQ) CHRYSLER'S TC (MASERATI COUPE)
(AS) CARAVAN/GRAND CARAVAN/CARAVAN C/V
VOYAGER/GRAND VOYAGER/TOWN & COUNTRY
(AY) IMPERIAL/NEW YORKER FIFTH AVENUE


SYMPTOM/CONDITION:

The vehicle's speedometer reading fluctuates and/or the speed control is inoperative or disengages intermittently. This may be caused by spread female terminals at the 2-way distance sensor connector.


DIAGNOSIS:

Inspect the 2-way distance sensor connector for terminal push outs or damage to the connector, such as broken terminals or locking fingers. If no other problems are found, insert the male pin terminal gauge (4368163 from package 4419586) into the female terminals of the 2-way wiring harness connector. The male terminal gauge should mate snugly. If the male terminal gauge is loose, replace the wiring harness 2-way connector using the following repair procedure. DO NOT ATTEMPT TO CLOSE DOWN THE FEMALE TERMINAL.


PARTS REQUIRED:

1 Wiring Connector Assembly Package 4419586


REPAIR PROCEDURE:

1. Cut the leads to the damaged 2-way connector at staggered lengths and place a piece of heat shrink tubing on each wire.


2. Cut the matching wires on the new 2-way connector to staggered lengths (allowing extra length for solder connections) so that the length of the new wiring is the same as the original wiring.

3. Strip one half inch of insulation from each wire and twist each pair of matching wires together. Solder each joint using a ROSIN CORE SOLDER. Center the heat shrink tubing over the joint and heat using a heat gun. Heat the joint until the tubing is tightly sealed and sealant comes out of both ends of the tube.

4. Install the wiring in its original routing and reconnect the distance sensor.






Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.






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