When a switch is open, no signal is provided to the corresponding input of the ECM. This “no signal” condition is also referred to as floating. On a ground type switch, floating voltage is approximately 5 DCV, while on a +V type switch the floating voltage is approximately 14 DCV.
When a ground type switch is closed, a ground signal of approximately 0 DCV is provided to the corresponding input of the ECM. When a +V type switch is closed a +V signal of approximately 24 DCV is provided to the corresponding input of the ECM.
Gear Select Switch, Traction Assist Switch, Motor Displacement Switch, Display Mode Switch
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| Illustration 1 | g01106787 |
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Gear select switch, traction assist switch, motor displacement switch, display mode switch | |
Gear Select Switch - (For Tracked Pavers)
| Gear Select Switch For Tracked Pavers | ||
|---|---|---|
| Switch Position | ECM Contact 13 | ECM Contact 12 |
| TRAVEL | +5DCV | 0DCV |
| PAVE | +5DCV | +5DCV |
| MANEUVER | 0DCV | +5DCV |
The gear select switch is an input to the ECM. The purpose of this switch is to allow the operator to select one of three operating modes (PAVE, TRAVEL, or MANEUVER) for the propel system. The switch is located on the machine operating station panel. A three position switch is used for this function. Two switch inputs at the ECM monitor the switch positions (See Table 1).
In the PAVE position, the paver is in low gear. Power is supplied to the vibrator and power is supplied to the grade and slope system. With the switch in this position, the augers and the conveyors will be allowed to run in AUTO mode. This is the position the switch should be in when the machine is paving.
In the TRAVEL position, the paver is in high gear. No power is supplied to the vibrator and no power is supplied to the grade and slope system. The augers and the conveyors will not run in AUTO mode. This is the position the switch should be in when roading the machine.
In the MANEUVER position, the paver is in low gear. No power is supplied to the vibrator and no power is supplied to the grade and slope system. With the switch in this position, the augers and conveyors will not run in AUTO mode. The machine is able to counter-rotate in this mode. This is accomplished by turning the speed dial all the way down, putting the speed lever in forward, and turning the steering wheel. This is the position the switch should be in when counter-rotation or tight turning is needed.
Gear Select Switch - (For Wheeled Pavers)
| Gear Select Switch For Wheeled Pavers | |
|---|---|
| Switch Position | ECM Contact 12 |
| HIGH | 0DCV |
| LOW | +5DCV |
The gear select switch is an input to the ECM. The purpose of this switch is to allow the operator to select one of two operating modes HIGH or LOW (H or L) for the propel system. The switch is located on the machine operating station panel. A two position switch is used for this function. One switch input at the ECM monitors the switch positions. (see Table 2)
In the L position, the paver is in low gear. Power is supplied to the vibrator and power is supplied to the grade and slope system. With the switch in this position, the augers and conveyors will be allowed to run in AUTO mode. This is the position the switch should be in when the machine is paving.
In the H position, the paver is in high gear. No power is supplied to the vibrator and no power is supplied to the grade and slope system. The augers and conveyors will not run in AUTO mode. This is the position the switch should be in when roading the machine.
Traction Assist Switch - (For Wheeled Pavers)
| Traction Assist Switch for Wheeled Pavers | |
|---|---|
| Switch Position | ECM Contact 26 |
| ON | 0DCV |
| OFF | +5DCV |
The traction assist switch is an input to the ECM. The purpose of this switch is to allow the machine operator to turn on the front wheel assist (traction assist). If the switch is in the ON position, the gear is LOW, and the lever is FORWARD, the ECM sends the command to the conveyor ECM to turn on the traction assist solenoid. The switch is located on the machine operating station panel. A two position switch is used for this function. One switch input at the ECM monitors the switch positions (see Table 3).
Motor Displacement Switch - (For Wheeled Pavers)
| Motor Displacement Switch For Wheeled Pavers | |
|---|---|
| Switch Position | ECM Contact 20 |
| 2 | 0DCV |
| 1 | +5DCV |
The motor displacement switch directly controls the motor displacement high solenoid. The switch is an input to the ECM for diagnostic and informational purposes. The ECM monitors the switch in order to determine what the speed and the steering maps should be. The ECM does not control the solenoid that changes the displacement of the motors. The purpose of this switch is to allow the machine operator to change the displacement of the motors. The switch is located on the machine operating station panel. A two position switch is used for this function and one switch input at the ECM monitors the switch positions (see Table 4).
| Display Mode Switch | ||
|---|---|---|
| Switch Position | ECM Contact 18 | ECM Contact 19 |
| HOLD | +14DCV | +14DCV |
| INCREMENT | +24DCv | +14DCV |
| CLEAR/STORE | +14DCV | +24DCv |
The display mode switch is an input to the ECM. The purpose of this switch is to scroll through ECM display information and to clear or store specific data in the ECM. This switch is mounted near the right side of the ECM, which is located behind the radiator access door on the left side of the machine. A three position toggle switch is used for this function. Two switch inputs at the ECM monitor the switch positions. (see Table 5)
When the ECM is in service mode 1, the purpose of this switch is to examine and clear the diagnostic codes. When the switch is held in the INCREMENT position, the ECM will scroll through the various diagnostic codes detected until the switch is released. When the switch is held in the CLEAR/STORE position, the displayed diagnostic code will be cleared from the ECM's memory if the code is no longer present.
When the ECM is in calibration mode 2, the purpose of this switch is to select and store calibrations. When the switch is held in the INCREMENT position, the ECM will scroll through the various calibration numbers until the switch is released. When the switch is held momentarily in the CLEAR/STORE position, the ECM will store the calibration if it is valid.
Note: The Throttle Switch is not used on A3P, AGP, B2G and BYG machines.
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| Illustration 2 | g01106855 |
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Throttle switch | |
| Throttle Switch | ||
|---|---|---|
| Switch Position | ECM Contact 15 | ECM Contact 14 |
| Lower RPM | 0DCV | +5DCV |
| Hold RPM | +5DCV | +5DCV |
| Raise RPM | +5DCV | 0DCV |
The throttle switch directly controls the increase and the decrease throttle solenoids. The throttle switch is also an input to the ECM for diagnostic and informational purposes. The ECM monitors the switch to make sure that the switch is not malfunctioning. The ECM does not control the solenoids that raise or lower the RPM of the engine. The purpose of this switch is to allow the machine operator to raise or lower the RPM of the engine. The throttle switch is located on the machine operating station panel. A three position toggle switch is used for this function. Two switch inputs at the ECM monitor the switch positions (see Table 6).
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| Illustration 3 | g01106872 |
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Control mode switch | |
| Control Mode Switch | ||
|---|---|---|
| Switch Position | ECM Contact 18 | ECM Contact 19 |
| HOLD | +14DCV | +14DCV |
| SCROLL | +24DCV | +24DCV |
The control mode switch is an input to the ECM. The purpose of this switch is to select what type of information to show on the three digit ECM display. One of three modes 0, 1, 2 can be selected. This switch is mounted near the right side of the ECM, which is located behind the radiator access door on the left side of the machine. A two position toggle switch is used for this function. Two switch inputs at the ECM monitor the switch positions. (see Table 7)
Mode 0 is the default or NORMAL operation mode. In this mode operator sequence errors will be shown on the display if they are present.
Mode 1 is the SERVICE mode. This mode is used to display the diagnostic codes which have occurred
Mode 2 is the CALIBRATION mode. This mode is used to calibrate sensor positions and valve currents.
In order to change modes, the control mode switch is held in the SCROLL position. The active mode will be shown on the ECM display. The ECM will scroll between the three modes until the switch is released. When the switch is released, the selected mode will be momentarily shown on the ECM display.
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| Illustration 4 | g01106916 |
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Parking brake switch | |
| Parking Brake Switch | ||
| Switch Position | ECM Contact 17 | ECM Contact 16 |
| OFF (Released) | 0DCV | +5DCV |
| ON (Set) | +5DCV | 0DCV |
The parking brake switch is an input to the ECM. The purpose of this switch is to allow the machine operator to turn on the parking brake. The switch is located on the machine operating station panel. A two position plunger type switch is used for this function. Two switch inputs at the ECM monitor the switch positions (see Table 8).
In the OFF or released position, the parking brake will not be set unless the machine is stopped.
In the ON or set position, the switch will light up, the flow to the drive motors will stop, and the parking brake will be set when the machine is below a certain speed.