INSERT-VALVE SEAT 9N2837 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) uses the value of the inlet manifold temperature in order to optimize emissions. The ECM adjusts the desired oxygen according to these conditions:
The desired oxygen is increased by 0.015 percent per degree celsius when the inlet manifold temperature is above 45 °C (113 °F).
The desired oxygen is decreased by 0.015 percent per degree celsius when the inlet manifold temperature is below 45 °C (113 °F).The maximum adjustment to the desired oxygen is 0.7 percent in either direction.The voltage supply for the inlet manifold temperature sensor is shared with the engine speed sensor for the ECM.The signal from the inlet manifold temperature sensor is a DC voltage. The voltage varies as the temperature changes. The valid voltage range is between 0.6 VDC and 5.1 VDC. These values are approximate.The engine speed must be greater than 400 rpm in order for the ECM to generate the diagnostic code for the sensor. The ECM will generate a 570-11 code if the voltage on the signal wire is equivalent to a temperature that is below −31 °C (−24 °F) or above 90 °C (194 °F). An incorrect voltage on the signal wire can be caused by these problems:
The signal wire is open.
The signal wire is shorted to a positive voltage source.
The signal wire is shorted to ground.
The operating voltage to the sensor is missing or incorrect.The ECM will not signal for an engine shutdown if a 570-11 code is activated. Instead, the ECM will ignore the signal from the sensor. The ECM will use a default temperature of 58 °C (136 °F) in order to adjust the desired oxygen. Therefore, control of emissions may not be optimal. If the voltage on the signal wire returns to the acceptable range, normal operation will resume.The most likely cause of a 570-11 diagnostic code is a problem with the wiring. The next likely cause is a problem with the sensor. The least likely cause is a problem with the ECM.
Illustration 1 g01045605
Schematic diagram for the inlet manifold temperature sensorThe engine is equipped with a remote control panel that includes a status control module and air/fuel ratio control.
Illustration 2 g01045606
Schematic diagram for the inlet manifold temperature sensorThe engine is configured for Canadian Standards Association (CSA). The engine is equipped with an optional remote control panel with air/fuel ratio control.Test Step 1. Inspect the Electrical Connectors and the Wiring
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect each of the following connectors:
J1/P1 connectors
Connectors for the inlet manifold temperature sensor
Illustration 3 g01046623
Harness side of the P1 connector (P1-2) +10 VDC (P1-3) Ground for the sensors (P1-27) Signal for the inlet manifold temperature
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the inlet manifold temperature sensor.
Check the harnesses and the wiring for abrasion and for pinch points from the inlet manifold temperature sensor to the ECM.Expected Result:The