Code P0715 is triggered when the transmission's Input Speed Sensor isn't providing a reliable signal. Common Problems are a defective input/turbine speed sensor, defective shift solenoids, a defective engine coolant temperature sensor, a defective valve body, or dirty Transmission Fluid that restricts the hydraulic passages.
bad vehicle speed sensor
Code P0715 means:Input/Turbine Speed Sensor Circuit Malfunction
Trouble code P0715 means: Input/turbine speed sensor circuit malfunction
The speed sensor on a 1997 Escort is located on the transmission. It is right behind the bell housing. The Code PO715 means that this sensor needs to be fixed or replaced. This sensor can sometimes pop out of its plug, so do not purchase a new one until this is checked.
idle air control valve error.... try to clean it up
In researching other computer trouble codes, I ran across the site that is listed under "Related Links" down below the sponsor links.That site suggests the P0715 code relates to "Input/Turbine Speed Sensor Circuit Malfunction"
Go to the Ford dealer and the code can be had if you give them the VIN.
Contact the dealer.
It should be a code on the door pillar.
spark plug gap for Ford Escort SE Vin code P is .052 / Vin code 3 is .044
po715 is the code for the neutral safety switch.
P1506 - Idle Air Control System At Adaptive ClipCheck for vacuum leaks and clean the throttle body, maybe check the iat and maf sensors.