1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,323 Posts
Welcome to Allpar. Ram HD? What year and engine please?
The output shaft speed sensor is important as it signals the PCM that the vehicle is in motion during a decel. The PCM would normally hold the IAC open during decel to let air in, like an electronic dashpot for stick-shift vehicles and prevent stalling. It can still idle fine.
The speedometer can run off the ABS sensor if no transmission speed sensor is present.
The output shaft speed sensor is important as it signals the PCM that the vehicle is in motion during a decel. The PCM would normally hold the IAC open during decel to let air in, like an electronic dashpot for stick-shift vehicles and prevent stalling. It can still idle fine.
The speedometer can run off the ABS sensor if no transmission speed sensor is present.