Sensor (Fuel Level)
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| Illustration 1 | g00854441 |
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| Illustration 2 | g00920513 |
The sensor (fuel level) is connected to the machine ECM at J1-51 (wire 447-PK) and J1-12 (wire G939-PK). The output of the fuel level sender is a resistive signal. The signal varies from 17 ohms to 457 ohms. The machine ECM recognizes a signal from 10 to 465 ohms as a valid signal. If the resistance is below 10 ohms, the machine ECM determines that the sender is shorted to ground. If the resistance is above 465 ohms, the machine ECM determines that the sender is shorted to the + battery circuit. The valid range of 17 ohms to 457 ohms corresponds to a fuel level of 100 to 0 percent.
Position Sensor (Swash plate Angle)
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| Illustration 3 | g00854479 |
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| Illustration 4 | g00920514 |
Note: The swash plate angle position sensor is equipped on machines in serial number range 1-2000 for all prefixes covered by this manual.
The position sensor (swash plate angle) is connected to the machine ECM at contact J1-62 (signal wire F475-GN). The power supply is +24 DCV. The ground contact is J1-12 (wire G939-PK). The output of the sensor is a analog signal from 0 to 5 volts. The voltage changes as the angle of the swash plate changes. The normal voltage is 2.26 to 4.4 volts. This corresponds to an angle of minus 5 degrees to +40 degrees. If the voltage is 0 to .25, the ECM determines that the sensor is shorted to ground. If the voltage is .26 to 2.25, the ECM determines that the signal is below the normal range. If the voltage is 4.5 to 4.74 volts, the ECM determines that the signal is above the normal range. If the voltage is above 4.75 volts, the ECM determines that the signal is shorted to the + battery circuit.
Pressure Sensor (Transmission Clutch)
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| Illustration 5 | g00854447 |
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| Illustration 6 | g00918454 |
The pressure sensor (transmission clutch) is connected to the machine ECM at contact J1-52 (signal wire G428-BU) and J1-10 (power wire 025-WH). The power supply is +5 DCV. The ground contact is J1-12 (wire G939-PK). The output of the sensor (transmission clutch pressure) is an analog signal with a valid signal from 0.46 to 4.4 volts. The voltage changes as the pressure changes. If the voltage is below 0.45 volts, the ECM determines that the sensor is shorted to ground. If the voltage is above 4.5 volts, the ECM determines that the sensor is shorted to the +battery circuit. The input voltage from 0.46 volts to 4.4 volts corresponds to a pressure of 102.1 kPa (14.8 psi) to 5695 kPa (826 psi). A value is normal if the value is within this range.
Temperature Sensor (Hydraulic Oil)
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| Illustration 7 | g00842499 |
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| Illustration 8 | g00986955 |
On machines in the following serial number ranges BDR1-2000, BDM1-2000, BDX1-2000, BCZ1-2000, BDK1-2000, BDY1-2000 and BEB1-2000, the temperature sensor (hydraulic oil) is connected to the machine ECM at contact J1-61.
On machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP, the temperature sensor (hydraulic oil) is connected to the machine ECM at contact J1-60.
In both applications the signal wire is 442-GY. The ECM 8 volt power supply is at contact J1-11 (wire R800-OR). The ground is contact J1-12 (wire G939-PK). The sensor is a PWM sensor. The output frequency is approximately 5000 Hz. The duty cycle varies from 0 to 100 percent. The duty cycle changes as the temperature changes. The machine ECM recognizes a duty cycle from 3 percent to 97 percent as a valid signal. If the duty cycle is below 3 percent, the ECM determines that the sensor is shorted to ground. If the duty cycle is above 97 percent, the ECM determines that the sensor is shorted to the +battery circuit. The duty cycle of 3 to 97 percent corresponds to a temperature of minus 114 to positive 170 degrees. The ECM will determine that a temperature within this range is normal.
Position Sensor (Travel Pedal)
Note: The travel pedal position sensor is equipped on machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP.
The travel pedal position sensor is mounted on the bottom mounting bracket for the travel pedal. This sensor is identical to the position sensor that is used on the auxiliary hydraulic pedal. The sensor receives a +battery power supply from the ECM at contact J1-58 (wire 308-YL). The sensor is connected to ECM ground at contact J1-12 (wire G939-PK). The sensor sends a 5 volt analogue signal to the ECM at contact J1-61 (wire T993-BR). The ECM is calibrated to correlate this voltage signal to a specific travel pedal position. The ECM automatically calibrates this sensor every time the key switch is turned to the ON position. The allowable voltage range for the sensor signal that the ECM will recognize is listed in the table below.
| Pedal Position Command | Signal (Voltage) |
|---|---|
| Initial Zero Position | 2.5 |
| Allowable Zero Range (ZP) | 2.3 to 2.7 |
| -100% (Reverse) | ZP minus 0.45 |
| +100% (Forward) | ZP plus 0.45 |
If the ECM detects a signal from the travel pedal position sensor that is less than .25 volts or greater than 4.75 volts, then the ECM will activate a diagnostic code for the sensor.
Reference: For more information on the travel pedal position sensor, refer to Systems Operation, "Travel Activation Function".
Position Sensor (Auxiliary Hydraulic Pedal)
Note: The travel pedal position sensor is equipped on machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP..
The auxiliary hydraulic pedal position sensor is mounted on the bottom mounting bracket for the auxiliary hydraulic pedal. This sensor is identical to the position sensor that is used on the travel pedal. The sensor receives a +battery power supply from the ECM at contact J1-58 (wire 308-YL). The sensor is connected to ECM ground at contact J1-12 (wire G939-PK). The sensor sends a 5 volt analogue signal to the ECM at contact J1-62 (wire M955-BR). The ECM is calibrated to correlate this voltage signal to a specific travel pedal position. The ECM automatically calibrates this sensor every time the key switch is turned to the ON position. The allowable voltage range for the sensor signal that the ECM will recognize is listed in the table below.
| Pedal Position | Signal (Voltage) |
|---|---|
| Initial Zero Position | 2.5 |
| Allowable Zero Range (ZP) | 2.4 to 2.6 |
| -100% (Reverse) | ZP minus 0.4 |
| +100% (Forward) | ZP plus 0.4 |
If the ECM detects a signal from the auxiliary hydraulic pedal position sensor that is less than .25 volts or greater than 4.75 volts, then the ECM will activate a diagnostic code for the sensor.
Reference: For more information on the auxiliary hydraulic pedal position sensor, refer to Systems Operation, "Auxiliary Hydraulic System".
Position Sensor (Right Joystick Thumbwheel)
The right joystick thumbwheel position sensor is equipped on machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP.
The right joystick thumbwheel position sensor is located inside the right hand joystick. The sensor indicates the position of the right hand joystick thumbwheel to the ECM. The sensor receives a 10 volt power supply from the ECM at contact J1-13 (wire E472-GN). The sensor is connected to the ECM ground at contact J1-12 (wire G939-PK). The sensor sends a pulse width modulated (PWM) signal to the ECM at contact J1-50 (wire E474-OR). The ECM monitors the PWM signal duty cycle in order to determine the position of the thumbwheel. The ECM uses this information to control the functions that are associated with the medium hydraulic function. The following table shows the percentage of the PWM duty cycle that the ECM will recognize.
| Thumbwheel Position Command | PWM Duty Cycle (%) |
|---|---|
| Initial Zero Position | 50 |
| Allowable Zero Range (ZP) | 48 to 52 |
| -100% (Full Left) | 33 |
| +100% Full Right) | 67 |
If the ECM detects a signal from the right hand joystick thumbwheel position sensor that is less than a 5 % duty cycle or greater than a 95 % duty cycle, then the ECM will activate a diagnostic code for the sensor.
Reference: For more information on the right hand joystick thumbwheel position sensor, refer to Systems Operation, "Medium Pressure Hydraulic System".
Speed Sensor (Transmission Output)
Note: The transmission output speed sensor is equipped on machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP.
The transmission output speed sensor is located on the transmission housing. When installed, the sensor is in the correct position and needs no adjustment. The sensor indicates the output speed of the transmission to the ECM. The ECM uses this information in order to control many functions on the machine including:
- Travel alarm activation
- Figure machine speed
- Parking Brake Function
- Travel Motor function
- Figure total distance traveled
The transmission output speed sensor receives the +battery power supply from the ECM at contact J1-58 (wire 308-YL). The sensor is grounded to the machine frame ground (wire 200-Bk). The frequency signal is received by the ECM at contact J1-24 (wire 768-OR). The ECM correlates the frequency signal from the sensor to a rpm value for the transmission.