Pull Up Voltage 3c186
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Copyright 1991, 2003 Caterpillar Inc. All Rights Reserved.
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7EK 789B TRUCK Service Magazine Media Number SEPD0318-00 Publication Date 1996/08/26 Update Date 1997/06/20
Explanation of "Pull Up Voltage" 0350 All Machines With Sensors And Switch Inputs On Electronic Control Modules REFERENCE: Service Manual For System Under Test The following is an explanation of "pull up voltage" found on switch and sensor inputs of electronic controls.
What is "Pull Up Voltage" ? "Pull up voltage" is a voltage supplied by the control module through a resistor which pulls up the "signal" lead of the device. See the Illustration. The signal lead is high except during the time the sensor takes the signal to a low level.
Typical Pull Up Circuit
Where Are Pull Up Circuits Used? Pull up circuits are typically used on most sensor and switch inputs of electronic controls. Frequency sensor inputs to the control module do not typically have a "pull up voltage".
Under What Conditions Will I See "Pull Up Voltage" ? When the sensor is disconnected at the harness connector, the signal lead should be pulled high by the "pull up circuit". When a voltmeter is placed between the signal lead and signal ground on the harness
file://C:\SIS\TMP\sis471prt.html
05/06/2003
Copyright 1991, 2003 Caterpillar Inc. All Rights Reserved.
Página 2 de 2
connector, (control side), the voltmeter should read the pull up voltage. A voltmeter reading of zero volts would indicate a broken wire or short to ground between the control and the sensor harness connector, or the control is faulty.
How Much Voltage Will Be Seen From Pull Up Circuits? Whatever the control uses on inputs. The exact voltage can be found in the reference material.
Explain What Is Meant By Analog And Digital Sensors Analog Sensors are sensors which provide a signal which can vary smoothly over a range such as fuel level senders. Digital sensors have only two output levels either high or low. Copyright 1991, 2003 Caterpillar Inc. All Rights Reserved.
file://C:\SIS\TMP\sis471prt.html
05/06/2003
Página 1 de 2
7EK 789B TRUCK Service Magazine Media Number SEPD0318-00 Publication Date 1996/08/26 Update Date 1997/06/20
Explanation of "Pull Up Voltage" 0350 All Machines With Sensors And Switch Inputs On Electronic Control Modules REFERENCE: Service Manual For System Under Test The following is an explanation of "pull up voltage" found on switch and sensor inputs of electronic controls.
What is "Pull Up Voltage" ? "Pull up voltage" is a voltage supplied by the control module through a resistor which pulls up the "signal" lead of the device. See the Illustration. The signal lead is high except during the time the sensor takes the signal to a low level.
Typical Pull Up Circuit
Where Are Pull Up Circuits Used? Pull up circuits are typically used on most sensor and switch inputs of electronic controls. Frequency sensor inputs to the control module do not typically have a "pull up voltage".
Under What Conditions Will I See "Pull Up Voltage" ? When the sensor is disconnected at the harness connector, the signal lead should be pulled high by the "pull up circuit". When a voltmeter is placed between the signal lead and signal ground on the harness
file://C:\SIS\TMP\sis471prt.html
05/06/2003
Copyright 1991, 2003 Caterpillar Inc. All Rights Reserved.
Página 2 de 2
connector, (control side), the voltmeter should read the pull up voltage. A voltmeter reading of zero volts would indicate a broken wire or short to ground between the control and the sensor harness connector, or the control is faulty.
How Much Voltage Will Be Seen From Pull Up Circuits? Whatever the control uses on inputs. The exact voltage can be found in the reference material.
Explain What Is Meant By Analog And Digital Sensors Analog Sensors are sensors which provide a signal which can vary smoothly over a range such as fuel level senders. Digital sensors have only two output levels either high or low. Copyright 1991, 2003 Caterpillar Inc. All Rights Reserved.
file://C:\SIS\TMP\sis471prt.html
05/06/2003
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