The Input and Output Speed Sensors are two-wire magnetic pickup devices that generate AC signals as rotation occurs. They are mounted in the left side of the transmission case and are considered primary inputs to the Transmission Control Module (TCM). Show Note: The 45RFE / 545RFE transmissions use two sensors, an input speed sensor and an output speed sensor. Both are the same part number.
The Input Speed Sensor provides information on how fast the input shaft is rotating. As the teeth of the input clutch hub pass by the sensor coil, an AC voltage is generated and sent to the TCM. The TCM interprets this information as input shaft rpm. The Output Speed Sensor generates an AC signal in a similar fashion, though its coil is excited by rotation of the rear planetary carrier lugs. The TCM interprets this information as output shaft rpm. The TCM compares the input and output speed signals to determine the following:
The TCM also compares the input speed signal and the engine speed signal to determine the following:
Failure of the Transmission Input Shaft Speed Sensor and/or the Output Shaft Speed Sensors are somewhat common on early model WJ Grand Cherokees. Diagnostic Trouble codes that may be tripped are: P0500 - No vehicle speed sensor signal P0720 - Low Output SPD Sensor RPM Above 15 MPH P0720 - Low Output SPD Sensor RPM Above 15 MPH P0721-P0723 - Sensor circuit range, performance, no signal
1. Raise vehicle.
1. Install the input
speed sensor into the transmission case.
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How many speed sensors does a Jeep Grand Cherokee have?The 42RE transmissions use a single sensor (located on the overdrive gear case, over the park gear). The 45RFE / 545RFE transmissions use two sensors, an input speed sensor and an output speed sensor.
Where is the transmission speed sensor located at?The Transmission speed sensor is located near the transmission output shaft. The Transmission speed sensor's location allows it to detect and send a signal to the engine computer through attached cables regarding the rotation and speed of the shaft.
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