2001 mustang gt speed sensor - Mustang Evolution

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Old 05-26-2013, 08:12 PM   #1
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2001 mustang gt speed sensor

ABS light is on

Check Engine light is on

Okay, so the speedometer is broke I assume, when you start going it sits at the bottom. Even when your going 70 or whichever speed it doesn't move. All the other gauges work.

Do I need new speed sensor or what?

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Old 05-27-2013, 09:14 AM   #2
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Use the instrument cluster diagnostic mode (click here for how) to see if the vehicle speed is displayed in the odometer. If it is the output shaft speed (OSS) sensor is OK, if not then it is bad or there is a wiring problem.

The speedometer "gauge" is a stepper motor driven by the instrument cluster microcontroller, based on data packets sent by the PCM. Using the cluster diag mode bypasses the gauge driver routines and hardware, and displays the PCM's digital data on the odometer.

An alternative would be to use an OBD2 data logging tool and monitor the vehicle speed PID, again if it reads correctly the OSS is OK...
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