Question about 2001 Mercury Grand Marquis

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2001 marquis speedometer stopped working. Replaced cluster- nothing, replaced speed sensor-- nothing, checked all fuses-- OK, stopped 3 wks ago when changine out rear air bags. What could the problem be?

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Check speed sensor signal at sensor and at cluster. Jack up drive wheels, Block other wheels, start car, put in drive. Then check both AC signals. The signal at the cluster is on pins 14 and 16. See diagrams below.

2001 marquis speedometer stopped working. Replaced - jturcotte_1514.gif

Posted on Apr 10, 2011

  • 1 more comment 
  • Jeff Turcotte
    Jeff Turcotte Apr 10, 2011

    sensor diagram:

  • Jeff Turcotte
    Jeff Turcotte Apr 10, 2011

    The same signal goes to pins 3 and 10 of the cruise control module.

  • Jeff Turcotte
    Jeff Turcotte Apr 10, 2011

    Hi, I just wanted to check another thing with you. The spring installation instructions say there is a procedure included with the kit that tells you how to disarm the air suspension light in the cluster. Did you get those instructions and execute them?

    Thanks, Jeff



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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.
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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.
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Yes GO to E2 .

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