Speedometer and Odometer not working during initial warming of engine heat cycles. Once radiator fan cools engine to normal temp, both start working again. Happens every time from start. It normally takes 18-24 minutes for this to occur based on ambient temp. Also get Error code P0500 (Speed Sensor Intermittent), if I clear after sensor comes back on, that error does not return while everything is working. If I idle for a long period of time when its working and the engine starts to heat back up to the top allowed before the fan comes on, it stops working and P0500 returns.
Your vehicle speed sensor is mounted in the transaxle housing which is also subject to heating and cooling. The wiring harness to and from the speed sensor is also subjected to engine heating and cooling. Anybody that knows anything about electrical circuits can tell you that an electrical circuit's worst enemy is heat. You need to diagnose the vehicle speed sensor circuits like the code is TELLING you to do.
SOURCE: Coolant temp is normal while idling, cools off when fans cut in
i would check to see if the stat is working right, do you have rear heat on this vech? . if you do you may have a air pocket, the windstars have a metal tube coning from the water pump that gose to the heater core lines for the rear heat and they like to fail. they get a pin hole leak that hard to find, the water pump also likes to fail also, not moving a enough fluid under load the ends of the inmpler wear down
SOURCE: 1995 F-250 runs rough
Check exhaust compression. Remove the O2 sensors before the cataylatic converters and see if it improves. If it does then the cats are cloged and need to be replaced.
SOURCE: 98 Mustang v6 - no AC
Make sure the radiator pressure cap is the correct one and that the hose is not soft--check the lower hose and heater hoses for softness as well. They should be firm, but not hard or cracking. The temperature sensor is reporting normal operating temperature, so it and the thermostat are working correctly (hot water would blow out of the radiator if it were stuck). Check the cooling fan for free turning and no noise. Check it's grounding connection. Check the fuse box for blown fuses to the fan and to the A/C compressor. Make sure all the relays and fuses are firmly pressed into their sockets. Check the A/C compressor clutch winding for resistance--should not read infinity. Does the blower motor for the heater/A/C run when either is turned on? The A/C switch on the dash may be defective.
Testimonial: "Excellent suggestions for diagnostic checks! Thanks!"
SOURCE: Engine surge during warm up.
Try changing your PCV valve make sure the hose is clean and not full of oil. Also check the elbow end that goes to the intake they tend to collapse from oil saturation. Hope this helps.
SOURCE: 97 Ford Thunderbird, 8 cyl,
A code P0500 may mean that one or more of the following has happened: The simplest thing to do is to reset the code and see if it comes back. Next, check all wiring and connectors that lead to the speed sensor. The location of the sensor depends on your vehicle. The sensor could be on the rear axle, transmission, or perhaps the wheel hub (brake) assembly. If the wiring and connectors are OK, then check the voltage at the speed sensor. Again, the exact procedure wil depend on your make and model of vehicle. If everything looks OK, replace the sensor.
Possible Solutions
Step
Action
Yes
No
Schematic Reference: Instrument Cluster Schematics
1
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
Does the VSS parameter match the speedometer display?
Go to Step 3
Go to Step 4
3
Does the odometer operate properly?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 4
4
Replace the instrument panel cluster (IPC). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?
Did you correct the condition?
Go to Step 5
--
5
System OK
Go to Step 2
How to trouble shoot
speedometer?
http://schematicsdiagram.blogspot.com/2011/06/speedometer-not-working.html
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why speedometer not working?
http://technoanswers.blogspot.com/2012/01/1996-fiat-bravo-speedometer-not-working.html
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Speedometer works but odometer not working?
http://technoanswers.blogspot.in/2012/01/speedometer-works-but-odometer-not.html-----------
Speedometer runs backward?
http://technoanswers.blogspot.com/2012/01/speedometer-runs-backward.html
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Warning lights on and
speedometer died?
http://howtobyme.blogspot.com/2011/08/warning-lights-on-and-speedometer-died.html
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ABS & Brake lights
warning indicator steady on dash and speedometer not working?
http://howtobyme.blogspot.com/2011/11/abs-brake-lights-warning-indicator.html
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Vehicles Cluster panel Not
reading Miles?
http://schematicsdiagram.blogspot.com/2011/12/vehicles-cluster-panel-not-reading.html
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Odometer works properly but speedometer works
intermittently?
http://technoanswers.blogspot.com/2012/01/odometer-works-properly-but-speedometer.html
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How odometer works in
cars?
http://technoanswers.blogspot.com/2011/11/how-odometer-works-in-cars.html
--------------
Speedometer not working on Ford?
http://repairhelpcenter.blogspot.in/2012/02/speedometer-not-working-on-1993-ford.html
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This will help.
Thanks
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The only idea I can come up with is maybe a broken wire near a coolant line opening and closing with the temp of the coolant.
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