Wednesday, April 29, 2009

Left Rear Parking Brake Pressure Sensor And Right Rear Parking Brake Pressure Sensor

Left Rear Parking Brake Pressure Sensor And Right Rear Parking Brake Pressure Sensor

The rear parking brake pressure sensors are inputs to the brake ECM. The sensors are designed to determine the left brake pressure and the right brake pressure. The pressure sensor produces a PWM signal. The brake pressure is available to other modules through the Cat Data Link.

The brake air pressure sensor is connected to the brake ECM through contact C. The sensor is being supplied with +24V. The sensor receives power from the brake ECM through contact A. The sensor contact B is connected to ground.

The ECM monitors the circuit for a short to ground or a short to battery voltage. A diagnostic code will be set.
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Wednesday, April 22, 2009

Rear Wheel Speed Sensor

Left Rear Wheel Speed Sensor And Right Rear Wheel Speed Sensor


The rear wheel speed sensors are inputs to the brake ECM. The speed sensors are designed to inform the ECM when the axle ratio is approximately 1.6 to 1. The brake ECM sends a signal to the selector valves and the proportional valves. The selector valves and proportional valves activate the parking brake of the affected wheel. The brake ECM sends a signal to the parking brake. The ECM signal will release the parking brake when the ratio of the right axle and the ratio of the left axle are 1 to 1.

The rear wheel speed sensors are frequency sensors. The rear wheel speed sensors are located on the drive axle. The sensor generates an AC signal. The ECM measures the frequency of the signal and the ECM responds accordingly to the signal. The diagnostic status of the sensors are available to other modules through the CAT Data Link.

The left rear wheel speed sensor is connected to the brake ECM through contact C. The sensor is being supplied with +10V. The sensor receives power from the brake ECM through contact A. The sensor contact B is connected to ground.
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Monday, April 20, 2009

Rear Differential Pump Pressure Sensor

Rear Differential Pump Pressure Sensor


The rear differential pump pressure sensor is a input signal (PWM) to the brake ECM. The sensor is designed to determine the outlet pressure of the rear differential pump. The pressure sensor is a PWM sensor. The signal is available to other modules through the Catr Data Link.

The rear differential pump pressure sensor is connected to the brake ECM through contact C. The sensor is being supplied with +8V. The sensor receives power from the brake ECM through contact A. The sensor contact B is connected to ground.

The ECM monitors the circuit for a short to ground or a short to battery voltage. A diagnostic code will be set.
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Monday, April 13, 2009

Sensors


Sensors

Sensor provide information to each input of the ECM about changing conditions. The ECM receives the following types of information: speed, temperature and position. The sensor signal changes in a proportional manner in order to reflect the changing condition. The ECM sends the information from the speed sensor to the gauges. The operator can view the information from the speed sensor on the gauges. The ECM recognizes two types of sensor signals.

Frequency - The sensor produces an AC signal. The AC signal frequency (Hz) varies as the condition changes.

Pulse Width Modulated Sensor (PWM) - The sensor produces a digital signal. The duty cycle of the digital signal varies as the condition changes and the frequency of the digital signal is constant.
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