Speedometer not working

Tiny
JACOBANDNICKOLAS
  • EXPERT
It could be a speed / distance sensor. What you need to do is have the computer scanned to identify where the prblem is coming from. Most parts stores will do it for free.

Let me know what you find.
Joe
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Monday, November 26th, 2018 AT 9:35 AM (Merged)
Tiny
LCN79
  • MEMBER
  • 1991 FORD F-150
Transmission problem
1991 Ford F150 V8 Four Wheel Drive Automatic

i just replaced speed sensor not more than ten minutes ago and the cable is fine too I checked but the speedometer isn't working cause it affects the way the truck shifts (stupid design) is there anything else what can cause it not too work. Also my gauge is fine cause while cable was mounted too sensor I spun the little wheel and I saw the needle jump on gauge
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Monday, November 26th, 2018 AT 9:35 AM (Merged)
Tiny
WRICE33
  • MEMBER
I have a 93 Ford and had the same problem. Believe it or not all it is is a burned out fuse. I think it was #8 in the fuse box but can't remember that for sure, it was about a year ago it happened. It makes the shift from 1st to 2nd very rough and the speedometer doesn't work at all. Replace the fuse and it runs like new and the speedometer works again. Hope this helps.

I just replaced speed sensor not more than ten minutes ago and the cable is fine too I checked but the speedometer isn't working cause it affects the way the truck shifts (stupid design) is there anything else what can cause it not too work. Also my gauge is fine cause while cable was mounted too sensor I spun the little wheel and I saw the needle jump on gauge[/quote]
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Monday, November 26th, 2018 AT 9:35 AM (Merged)
Tiny
DONALDGOSS
  • MEMBER
  • 1997 FORD F-150
Transmission problem
1997 Ford F-150 V8 Four Wheel Drive Automatic 230k miles

My 97 f-150 had a couple instrument bulbs burnt out. I removed the instrument cluster and replaced the bad bulbs, when I reinstalled the cluster and was going to drive the truck the transmission wouldnt shift and when it did it shifted very hard, wont go into drive at all. Does the speedo control the transmission shifting. I didnt unhook the battery when I did this. What could be the problem, everything is connected right and secure, I am hoping that the cluster is bad because I cant afford a trans rebuild, I truly believe the trans problem is effected by the defective speedo because everything was fine until I did the work on the speedo, but I would like the advice of a trained expert because I am by no means a mechanic.I sure could use your advice. Thanks don
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Monday, November 26th, 2018 AT 9:35 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
I don't think you need a trans. It sounds like there is a problem with the vehicle speed sensor. It runs the speedo and determines shifting patterns. Have you checked it?
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-2
Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
JEFFERO
  • MEMBER
  • FORD F-150
I have a 1994 F-150 4x4 my speedometer quit and the off light on my overdrive is flashing, also I have to mess with the starter solenoid to get the truck to start. Are all these things related somehow? Can someone please tell me what the problem is so I can fix it.
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
TAURUSWHEEL
  • MEMBER
It's possible the vss, vehicle speed sensor, is acting up, the od light flashing is usually a sign that the trans is experiencing some sort of problem. What does "Mess" with the solenoid mean?
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
CDM
  • MEMBER
  • FORD F-150
I have a 1998 f150 and my speedometer is reading 0 while driving down the road, but the odometer is still working what could this be and how can I fix it.
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
MERLIN2021
  • EXPERT
Replace instrument cluster, Ford will need to program it!
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
JJJMDS
  • MEMBER
  • 1999 FORD F-150
  • 208,332 MILES
No speedometer movement, and automatic transmission is late when shifting from first to second gear. Engine is a 4.2 liter V-6, and I believe transmission is 4r70w.
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Check the connector at the vehicle speed sensor. Either that or the sensor itself may be bad.

Roy
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
CHUCKVIC
  • MEMBER
  • 1994 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 20,800 MILES
While driving the other day, was going downhill and noticed my speedometer and electronic odometer quit working then tranny down shifted with a jolt, when sped up transmission now shift at 2500 rpm but with a hard jolt, any ideas
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
JAMES W.
  • MEMBER
The vehicle speed sensor is located on the differential housing in the middle of the third member. Here is a guide to help you see what I am talking about.

Check out the diagrams (Below)

Please let us know what happens.

Cheers
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
CHUCKVIC
  • MEMBER
Yep that did the trick I got a new sensor for 34.99 and it fixed the problem thanks for the tip this site is great.
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
CLASSICRON
  • MEMBER
  • 1999 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 49,900 MILES
I have trouble code P0720 set. Speedometer just started to act erratic yesterday with the code being set at the same time. I the needle jumps all over the place and sometimes just does not work. How do I troubleshoot this?

Thanks,

Ron
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
IMPALASS
  • EXPERT
Hello -

To better assist you can you tell me your engine size in liter and the 8th digit of your VIN
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
CLASSICRON
  • MEMBER
In reply to your question the engine is a 4.2 L V6. The 8th digit is a 2. The whole vin is:
1FTZF1722XNA80837.

Ron
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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
IMPALASS
  • EXPERT
Hi Ron

Thanks for the information

They are connected. The code means:

P0720 (Manural Trans.) Insufficient input from Output Shaft Speed sensor


https://www.2carpros.com/forum/automotive_pictures/248015_Picture1_62.jpg



As for troubleshooting you need a specific scan tool to test.

TEST TJ: OUTPUT SHAFT SPEED (OSS) SENSOR
NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all EEC-V systems are working properly and DTCs are no longer present.
Diagnostic Aids
Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:
" OSS sensor.
" Wiring harness circuits (OSS and SIG RTN).
" Powertrain Control Module (PCM).
1. 1) DTC P0720, P0721, P0722, P0723 & P1900: Verify Drive Cycle

Using scan tool, select OSS PID from PID/DATA monitor menu. Road test vehicle and observe PID value. Shift transmission through all gear rangers, shift up and down. If PID value increases and decreases with engine and vehicle speed, go to next step. If PID value does not increase and decrease with engine and vehicle speed, go to step 3.
2. 2) Visual Inspection

Turn ignition off. Disconnect OSS sensor connector located on side of transmission. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. If connector is okay, fault is intermittent. Go to TEST Z and check for intermittent faults.
3. 3) Check For Short To Power

Turn ignition on. Measure voltage between OSS terminal at OSS sensor wiring harness connector and chassis ground. See Fig. 199. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in OSS circuit.
Fig. 199: Identifying Output Shaft Speed (OSS) Sensor Circuits & Connector Terminals
Courtesy of FORD MOTOR CO.
4. 4) Check For Open Circuit

Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Measure resistance of OSS circuit between PCM connector pin No. 84 and OSS terminal at OSS sensor wiring harness connector. Also measure resistance of SIG RTN circuit between PCM connector pin No. 91 and SIG RTN terminal at OSS sensor wiring harness connector. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair open in appropriate circuit.
5. 5) Check For Short To Ground

Measure resistance between OSS sensor wiring harness connector terminals. Also measure resistance between OSS terminal at OSS sensor wiring harness connector and chassis ground. If both resistance readings are more than 10,000 ohms, go to next step. If any resistance reading is 10,000 ohms or less, repair short circuit.
6. 6) Check OSS Sensor Resistance

Measure resistance between OSS sensor terminals. If resistance is 450-750 ohms, replace PCM. If resistance is not 450-750 ohms, replace OSS sensor.

My suggestion is it is located on the left side of the transmission. I would do the step 6 and check the resistance. They are about $20 dollars at Auto Zone......

Look at the wiring really good....broken, heated, corroded etc. If all good then ohm it then replace it and see if you still have the same problem. Make sure you check the connector wires really good...they may have pulled out....but most likely it is the sensor.
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+1
Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
IMPALASS
  • EXPERT
Hello -

Also, it looks like you may have some recalls on your vehicle. The dealer may fix these for free. Please contact the dealer service department, give them the VIN number of your car and have them check on these to see if they apply to you.


https://www.2carpros.com/forum/automotive_pictures/248015_Recalls_39.jpg


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Monday, November 26th, 2018 AT 9:36 AM (Merged)
Tiny
GUSLEO
  • MEMBER
  • 1996 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 91,000 MILES
My speedometer quit working and the transmission would not shift properly and sometimes it wouldn't shift at all. I have replaced the speed sensor and I have had the speedometer rebuilt. The speedometer technician said there was a problem with said speedometer and it was repaired. Now its work intermittently; when it works everything is great but then it quits again and the same old problem occurs.
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Monday, November 26th, 2018 AT 9:36 AM (Merged)

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