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Possible Causes

Possible Causes 
(T14) OUTPUT SPEED SIGNAL CIRCUIT OPEN
(T13) SENSOR GROUND CIRCUIT OPEN
(T14) OUTPUT SPEED SIGNAL CIRCUIT SHORTED TO GROUND
(T13) SENSOR GROUND CIRCUIT SHORTED TO GROUND
(T14) OUTPUT SPEED SIGNAL CIRCUIT SHORTED TO VOLTAGE
(T13) SPEED SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
OUTPUT SPEED SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  65RFE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .