Transmission Output Speed Sensors 1 & 2
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| Illustration 1 | g00495970 |
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Speed Sensor (Transmission Output) | |
The "Transmission Output Speed" sensors are inputs to the "Transmission" ECM. The "Transmission Output Speed" sensors connect to connector contact J1-7 (Sensor 1) and J2-43 (Sensor 2). The sensor signals to the "Transmission" ECM the speed of the "Transmission Output" shaft. The ECM uses the sensor information to shift the transmission at the optimal efficiency. The sensor is on the gearbox housing at the input end of the transmission.
Each sensor has a connector with three contacts. See the System Schematic section in this manual for the ECM connections.
The sensor signal is a square wave. The sensor signal wire is connected to contact "C". The amplitude of the square wave is approximately 10 volts. The frequency (Hz) of the square wave is directly proportional to the speed of the "Transmission Output" shaft.
Transmission output speed is directly related to machine ground speed. Therefore, the speedometer and other electronic controls also use the sensor signal. The sensor signal is on contact "C".
The ECM records diagnostic codes that occur with the sensor signal. The diagnostic code is recorded while the machine is in operation and the signal is not correct.
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| Illustration 2 | g03329411 |
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Engine Speed Sensor | |
The "Engine Speed" sensor is an analog speed sensor. The sensor measures the rotational speed of the engine by generating a frequency from a passing gear tooth. The signal is sent to the Transmission ECM and Brake ECM,
The Engine Speed sensor is an input of the ECM. The Speed Sensor signals the ECM on the speed of the engine. The ECM uses the information from the sensor to calculate the slippage. The ECM sends the information on the slippage to the VIMS on the Cat Data Link. For more information, see Systems Operation, "Tattletale Function".
The Engine Speed sensor is a frequency sensor and the sensor is on the flywheel housing. The sensor generates an AC signal from the flywheel gear teeth. The frequency of the signal is directly proportional to the speed of the engine.
The ECM records diagnostic codes that occur with the sensor signal as a CID 190. The diagnostic code is recorded while the machine is in operation and the signal is not correct.
The Engine Speed sensor has a connector with two contacts. The sensor sends the speed signal to the ECM from contact 1. Contact 2 is connected to frame ground.
Transmission Input Speed Sensor
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| Illustration 3 | g06361373 |
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Transmission Input Speed Sensor | |
The "Transmission Input Speed" sensor is an input to the "Transmission" ECM. The ECM receives a frequency signal from the sensor. The signal indicates the rotational speed of the connection from the output of the torque converter to the input of the transmission. The signal is generated by a gear passing in front of the sensor. One full pulse is generated per tooth on the gear. The signal is low when a gear tooth is in front of the sensor and high when between teeth. The "Transmission Input Speed" sensor signal connects at contact J1-4. The sensor ground is connected to the ECM through pin J1-5.
Transmission Oil Temperature Sensor
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| Illustration 4 | g00495966 |
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Temperature Sensor (Transmission Oil) | |
The
The Transmission Oil Temperature sensor has a connector with three contacts. The sensor receives + 8 volt sensor supply through contact "A" (J1-44). The sensor sends a signal to the ECM through contact "C". Contact "B" is connected to J2-63.
The ECM records diagnostic codes that occur with the "Transmission Oil Temperature" sensor.
Torque Converter Outlet Temperature Sensor
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| Illustration 5 | g00329095 |
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Torque Converter Outlet Temperature sensor | |
The "Torque Converter Outlet Temperature" sensor is a pulse width modulated (PWM) sensor. The sensor is an input of the ECM. The sensor connects to connector contact J2-33. The sensor signals the ECM on the temperature of the Torque Converter. The ECM sends the information to the VIMS via the Cat Data Link.
The "Torque Converter Temperature" sensor has a connector with three contacts. The sensor receives + 8 volt sensor supply through contact "A". The sensor sends a signal to the ECM through contact "C". Contact "B" is connected to frame ground.
The ECM records diagnostic codes that occur with the Torque Converter Temperature sensor.
Steer Valve Spool Position Sensor
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| Illustration 6 | g06366374 |
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Graphic of the Steer Valve Spool Position sensor | |
The Steer Valve Spool Position sensor is located inside the left frame rail, mounted on the steering valve.
The Transmission ECM monitors the signal circuit from the "Steer Valve Spool Position" sensor for diagnostics at all machine speeds.
At travel speeds below
During steering operation, a probe on the end of the valve spool moves in and out of the position sensor. The sensor sends an analog voltage signal to the ECM on the signal circuit. As the position of the spool changes, the voltage of the signal changes.
When the sensor is powered, the ECM expects the voltage of the signal circuit to be in the range of 0.5 VDC to 4.5 VDC. When the steering wheel is stationary in any position, the ECM expects the sensor signal voltage to be in the range of 2.5 ± 0.3 VDC.
When the steering wheel is moved to the right on the steering axis, the signal circuit voltage decreases toward the 0.5 VDC end of the range. When the steering wheel is moved to the left on the steering axis, the signal circuit voltage increases toward the 4.5 VDC end of the range.
When the steering wheel is stationary in any position on the steering axis, the signal voltage returns to the neutral range of 2.5 ± 0.3 VDC.
Left-Hand and Right-Hand Steering Position Sensors
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| Illustration 7 | g06361426 |
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Location of Steering Position Sensors | |
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| Illustration 8 | g06361473 |
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Graphic of the Steering Position sensor and connector (1) Not Connected (2) Voltage (3) Ground (4) Signal | |
The steering cylinder position sensors are mounted inside the head-end of each of the steering cylinders. Each position sensor uses a timed magnetic signal and a magnet in the cylinder to sensor the position of the steering cylinder within the cylinder stroke. The sensor sends a pulse width modulated signal to the Transmission ECM.