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Unread 08-22-2006, 04:27 PM   #1
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Exclamation 1998 Ford Escort Transmission

I have a Ford Escort and the automatic transmission will jitter while the car is coasting. The service engine light came on and it gave me a P0715 error and I want to know if the jittering while coasting has anything to do with the code? P0715 says "Input/Turbine Speed Sensor Circuit Malfunction" so I would also like to know if I replace the speed sensor will the jittering go away?



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Unread 08-23-2006, 06:59 AM   #2
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There is no way of knowing if replacing the turbine speed sensor will correct your "jittering" problem. There could be other problems with your car as well as the speed sensor fault. But you first need to repair any hard faults.

I think you should replace the sensor but before replacing the sensor inspect the wireloom coming from the speed sensor as far back as posible looking for any place the wires could be grounding out (or broken). You could also do a continuity test on the wires from the sensor to the PCM (control module) but thats a little more involved.

Hope this helps,

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Unread 08-23-2006, 03:22 PM   #3
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Are you sure it is the tranny? I had the same problem with my mercury. I ended up replacing the spark plugs and it went away.
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Unread 08-23-2006, 05:29 PM   #4
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I am not sure it is the tranny... but the MIL light came on and gave the P0715 code which is transmission error, in my case I hope its just the spark plugs. The only time the car feels like it is pushing and pulling ("jittering") is when the car is first started from a cold start and the first time the car is coasting at 35-40 mph. Right now the car is still driveable. I will take your guy's suggestions, thanks!

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Unread 08-26-2006, 01:53 AM   #5
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Originally Posted by Valuedesktop View Post
I am not sure it is the tranny... but the MIL light came on and gave the P0715 code which is transmission error, in my case I hope its just the spark plugs. The only time the car feels like it is pushing and pulling ("jittering") is when the car is first started from a cold start and the first time the car is coasting at 35-40 mph. Right now the car is still driveable. I will take your guy's suggestions, thanks!
Sounds like a detonation problem to me. Have a mechanic check your sparkplug wires (wouldn't want you getting electrocuted doing that yourself ) and maybe replace your spark plugs. My friends have had problems with their engines knocking and it was simply due to loose spark plug wires.

Really sounds to me like your engine isn't running right, not the transmission.
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Unread 08-26-2006, 04:57 PM   #6
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I will check for loose spark plug wires first and on the next oil change I will replace spark plugs. Thanks.

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Unread 08-26-2006, 05:16 PM   #7
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I will check for loose spark plug wires first and on the next oil change I will replace spark plugs. Thanks.
Yes do that first, spark plugs could cause the car to randomly " miss fire" and will be off balance and give you that jittering feel, it happened in my moms BMW she had to replace one of the modules , but it could just be the spark plugs or wires.
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Unread 08-26-2006, 07:23 PM   #8
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Originally Posted by --Filip-- View Post
Sounds like a detonation problem to me. Have a mechanic check your sparkplug wires (wouldn't want you getting electrocuted doing that yourself ) and maybe replace your spark plugs. My friends have had problems with their engines knocking and it was simply due to loose spark plug wires.

Really sounds to me like your engine isn't running right, not the transmission.
I don't think he would be getting knock if the car was coasting with no load on the engine, and especially when it was just idling after start. If he was getting knock the kr sensors should have picked it up and retarded the timing on the engine so his acceleration would just be lower. I could be wrong though, I'm not 100 percent sure.
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Unread 08-26-2006, 09:39 PM   #9
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Proper procedure would be to fix any hard faults first, ie.. P0715 (transmision turbine speed sensor fault). A faulty trans sensor can cause all kinds of drivability concerns, ie.. surging, jerking, trans slippage. Get your trans problem fixed first.

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Unread 08-26-2006, 10:13 PM   #10
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It is a ford, the tranny might just be giving up on you....



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