Question about 1991 Volvo 740

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Speedometer/Odometer Failure I'm guessing that this is the result of a bad speed sensor on the rear diff.; but if that is the case - I thought that the odometer would still function. I was wondering what else I should look for to troubleshoot the problem further before dropping $150 on a new unit.

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  • Alderfin Jun 17, 2008

    Thanks for confirming -

  • Brian Muller
    Brian Muller Jun 30, 2008

    I have a speedometer/odometer that don't work as well. How do I know if it is due to the sensor or the board on the dash unit?
    My car is a 1990 740 Turbo so it has the Japanese circuit board on the dash unit.


  • Brian Muller
    Brian Muller May 11, 2010

    Thanks, I will check that. I am curious though, when your speedometer cut out did it go gradually, bouncing the needle whenever you hit a bump?

    Also, I'm not sure where my garage manual is, as I just finished moving, but I do not know where the sensor is.


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3 Answers

Try checking the wiring where it enters the sensor; my speedo needle "bounced" occasionally for a while before it quit completely, and at times worked for a bit when driving in the rain. On inspection, the aforementioned wires had rotted due to age and just needed some tlc (aka cut back and reattached).

Posted on Jul 09, 2008

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I have had the same problem in my volvo. i didnt have to replace the sencor it was just a bronken wire, and from what i have read a broken wire is more like then a bad sensor. to see if that is the case just jack up the back of ur car, and look at the sensor there r 2 wire. if they r not connected then there is ur problem.

Posted on Jul 01, 2008

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If your speed sensor is not working ,thats mean your odometer is not gonna work.try to take off your sensor and spin it ,while somebody looking at it,it suppose to move when you spin it,usually if the odometer stop working you gonna need a new/used one,

Posted on Jun 17, 2008

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1 Answer

2003 Grand Marquis digital speedo only reads "0". All other displays read correctly. Could it be the speed control? If so, where exactly is it located?


The speedometer provides speed information based on a speed/distance pulse signal from the vehicle speed sensor (VSS). The VSS is mounted on the speedometer driven gear in the transmission.
or the gauge is bad .
  • The speedometer/odometer is inoperative
  • CJB fuse 14 (10A).
  • Vehicle speed sensor (VSS).
  • Circuitry.
  • Instrument cluster.
  • Go To Pinpoint Test E .
PINPOINT TEST E: THE SPEEDOMETER/ODOMETER IS INOPERATIVE CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
CONDITIONS DETAILS/RESULTS/ACTIONS E1 CHECK VSS SPEED SIGNAL BETWEEN CIRCUITS 679 (GY/BK) AND CIRCUIT 676 (PK/OG)
VSS C1088
Raise the drive wheels off the ground. While rotating the driveshaft, measure the AC voltage between the VSS C1088 pin 1, circuit 679 (GY/BK), component side and the VSS C1088 pin 2, circuit 676 (PK/OG), component side.
  • Is the voltage between 1.3 volts AC to 6.1 volts AC?
Yes GO to E2 .

No CHECK and INSPECT the speedometer drive gear. INSTALL a new VSS if the speedometer drive gear is OK. TEST the system for normal operation E2 CHECK CIRCUIT 679 (GY/BK) AND CIRCUIT 676 (PK/OG) BETWEEN THE INSTRUMENT CLUSTER AND THE VSS

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The odometer does not work. changed it out with other unit and still does not work. appears to be electrical or computer? speedo works fine


Speedometer, Odometer and Trip Odometer are driven by same circuit. Failure of Odometer and Trip Odometer suggests a circuit board fault on the instrument panel. A used instrument panel or repair of yours is probabaly best options.

The speedometer should malfunction too if speed sensor failed. If only the odometer and trip meter stopped working, it will most likely be the cluster itself. I had this problem, but since took the cluster out and give it a nice tap/knock, put it back in and it has worked since. Keep in mind that the VSS provides signal input to circuit that drives speedometer.

Instrument panel removal is not hard if you follow the shop manual instructions for trim removal. I've done it once on my 2.5TL to replace the D4 light bulb. PM your email address and I'll forward the pdf files for the procedure. The Vehicle Speed Sensor goes into the differential, and is what makes your speedometer and odometers work. If that fails, then your D4 light should start flashing, and either the speedometer will be bouncy or not work at all. Perhaps he forgot that 1Gs have a differential, so he said the tranny, but it's in the diff.

Hope helps.

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i would start with the speed sensor, have the computer scanned for codes that will help to pinpiont the problem,i would bet its the speed sensor, hope this helps.

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1 Answer

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I am having the same problem. I replaced the speed sensor on the rear diff. and the problem went away but when i started it the next day the problem came back. If you figure it out let me know.

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