CRCT BREAKER AS 9S0173 - Caterpillar

System Operation Description:The digital sensor supply provides power to all digital sensors. The Electronic Control Module (ECM) supplies 8.0 0.4 VDC from the ECM connector J1/P1 to each digital sensor connector pin "A". The digital sensor return is used as the return line for the digital sensors, speed/timing sensors, and the switch inputs to the ECM. The digital return line is from the ECM connector J1/P1 to each digital sensor connector pin "B". The digital sensor supply is output short circuit protected. A short circuit to the battery will not damage the circuit inside the ECM. The digital sensors are not protected from overvoltage.The following list contains a description of the digital sensors that are found on the engine.Left Exhaust Temperature Sensor - The ECM uses the signal from the sensor to monitor left exhaust temperature. The sensor is mounted in the left exhaust manifold before the turbocharger. The sensor output is a constant frequency signal with a pulse width that varies with the exhaust temperature. The output signal is referred to as a duty cycle or as a pulse width modulated signal. The output signal is expressed as a percentage between 0 and 100 percent. The Caterpillar Electronic Technician (ET) will display the exhaust temperature as a value between 49 °C to 850 °C (120 °F to 1562 °F). If the actual temperature is between −40 °C to 49 °C (−40 °F to 120 °F), the display will read 30 °C (86 °F). If the temperature is above 851 °C (1564 °F), the display will read 851 °C (1564 °F).Right Exhaust Temperature Sensor - The ECM uses the signal from the sensor to monitor right exhaust temperature. The sensor is mounted in the right exhaust manifold before the turbocharger. The sensor output is a constant frequency signal with a pulse width that varies with the exhaust temperature. The output signal is referred to as a duty cycle or as a pulse width modulated signal. The output signal is expressed as a percentage between 0 and 100 percent. The Cat ET will display the exhaust temperature as a value between 49 °C to 850 °C (120 °F to 1562 °F). If the actual temperature is between −40 °C to 49 °C (−40 °F to 120 °F), the display will read 30 °C (86 °F). If the temperature is above 851 °C (1564 °F), the display will read 851 °C (1564 °F).Note: The engine monitoring system may be programmed by dealers and/or customers. Dealers and/or customers can monitor customized warnings, derates, shutdown override setpoints, and delay times using Cat ET. Customized parameters may affect the behavior of the ECM. The behavior of the ECM may vary from the description that is given in this system operation section. You may refer to the diagnostic procedure Troubleshooting, "Engine Monitoring System" in order to determine if there are any parameters that are affecting engine operation.
Illustration 1 g01020181
Typical exampleTest Step 1. Check for Connector Damage.
Turn the breaker for the battery to the OFF