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Shawn
Shawn, Auto Service Technician
Category: Ford
Satisfied Customers: 3756
Experience:  16 years experience Ford,Nissan and Honda dealership in all areas
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my speedometer just stopped working

Customer Question

my speedometer just stopped working
Submitted: 7 years ago.
Category: Ford
Expert:  Shawn replied 7 years ago.
Hi JACUSTOMER-g3g50jw6-.




Thank you for asking your question on JustAnswer. The most common cause of the problem you are having is a defective VSS (Vehicle Speed Sensor) located on the transmission end of the speedometer cable, below are some test procedures in order to determine, hope this helps you out.




SPEEDOMETER IS INOPERATIVE TEST C


C1 CHECK CONNECTIONS

  • Verify quick connect is properly attached at speedometer head.
  • Check square drive tip of the core at transmission end of cable to make sure it is properly seated in the speed sensor.
  • Are connections good and is drive tip seated properly?
Yes
GO to C2 .

 

No
RESEAT drive tip if not seated properly. CHECK to see if speedometer is now operative.

 


C2 CHECK ROTATION

  • Rotate gear to assure core is free and not bound up.
  • Does cable core rotate freely?
Yes
GO to C3 .

 

No
REPLACE core.

 


C3 CHECK ODOMETER/POINTER

  • Check operation of odometer/pointer.
Odometer is operating and speedometer pointer does not operate
REPLACE speedometer head. RECHECK speedometer for operation.

 

Speedometer pointer operates and odometer does not operate
REPLACE speedometer head. CHECK speedometer for operation.

 

If both odometer and speedometer pointer fail to operate
GO to C4 .

 


C4 CHECK SPEEDOMETER HEAD

  • Disconnect cable and check that magnet shaft in speedometer head turns freely. By rotating with a short section of cable core.
  • Does magnet shaft turn freely?
No
REPLACE speedometer head. RECHECK speedometer for operation.

 

Yes
GO to C5 .

 


C5 CHECK SPEED SENSOR

  • Disconnect cable from speed sensor and check that shaft in sensor turns freely.
  • Does shaft turn freely?
No
REPLACE speed sensor. CHECK speedometer for operation.

 

Yes
GO to C6 .

 


C6 CHECK GEARS

  • Check drive gear and driven gear for damage or wear.
  • Check drive tip on both ends of the cable for wear.
  • Is drive gear, drive tip or driven gear damaged?
Yes
REPLACE damaged or worn gear or core. CHECK speedometer for operation.

 

No
GO to C7 .

C7 CHECK CABLE

  • Check speedometer cable for kinks or improper routing.
  • Are there kinks in cable?
Yes
REPLACE cable. CHECK speedometer for operation.

 

No
GO to C8 .

 


C8 CHECK CORE

  • With cable disconnected, check core.
  • Is core damaged or will not turn?
Yes
REPLACE core. CHECK speedometer for operation.

 

No
System OK.



Speed Sensor


Removal

  1. Raise the vehicle on a hoist.
  2. Separate the electrical connector to speed sensor on the transmission or transfer case.
  3. Disconnect speedometer cable from speed sensor.
  4. Remove retaining bolt.
  5. Remove speed sensor.
  6. Remove drive gear.

Installation

  1. Install drive gear on speed sensor.
  2. Install speedometer cable into speed sensor.
  3. Install speed sensor in transmission or transfer case.
  4. Install and tighten retaining bolt.
  5. Connect electrical connector to speed sensor on the transmission or transfer case.
  6. Lower the vehicle.
graphic

Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.

Edited by Shawn on 6/3/2010 at 12:40 AM EST