VALVE 2N3297 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the sensors. Also use this test procedure if any one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes
CDL Code and Description Conditions which Generate this Code System Response
3090-3
Aftertreatment #1 SCR Dosing Reagent Pressure Sensor:Voltage Above Normal The Electronic Control Module (ECM) detects signal voltage that is not in the acceptable range. The code is logged.
The value of the parameter is set to a default value.
3090-4
Aftertreatment #1 SCR Dosing Reagent Pressure Sensor:Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range. The code is logged.
The value of the parameter is set to a default value.
3092-3
Aftertreatment #1 SCR Dosing Air Assist Pressure Sensor:Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range. The code is logged.
The value of the parameter is set to a default value.
3092-4
Aftertreatment #1 SCR Dosing Air Assist Pressure Sensor:Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range. The code is logged.
The value of the parameter is set to a default value.
3107-3
Aftertreatment #1 SCR Catalyst Outlet Gas Temperature Sensor:Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range. The code is logged.
The value of the parameter is set to a default value.
3107-4
Aftertreatment #1 SCR Catalyst Outlet Gas Temperature Sensor:Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range. The code is logged.
The value of the parameter is set to a default value. The supply voltage is routed to terminal 1 of each sensor connector. The sensor return is routed to terminal 2 of each sensor connector. For the pressure sensors, the sensor signal is routed to terminal 3 of each sensor connector. The sensor signal for the exhaust temperature sensors is routed to terminals 3 and 4 of the connector for the sensor buffer.The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.Diagnostic Testing using Caterpillar Electronic Technician (ET)Wiggle Test - The wiggle test allows the technician to monitor the status of the signals from the sensors. For additional information regarding the wiggle test, refer to the documentation that accompanies the Cat ET software.
Illustration 1 g03320797
Schematic
Test Step 1. Check for Diagnostic Codes
Connect Caterpillar Electronic Technician (ET) to the service tool connector. Establish a connection with the engine ECM.
Turn the keyswitch to the ON position.
Look for the following codes that are active or logged:
-3
-4Results:
Active -3 Code - A -3 diagnostic code is active. Proceed to Test Step 2.
Active -4 code - A -4 diagnostic code is active. Proceed to Test Step 3.Test Step 2. Create a Short at the Sensor Connector
Use a test lamp in order to create a short between terminal 3 (signal) and terminal 2 (return) at the sensor connector.
Turn the keyswitch to the ON position.
Monitor the diagnostic codes on Cat ET. Check for an