VALVE GP-BRAKE CONTROL 2013198 - Caterpillar

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Schematic
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P1 ECM Connector
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Sensor connectorTest Step 1. Disconnect the ECM Connector and Check for Active Diagnostic Codes
Turn the keyswitch to the OFF position.
Connect the Caterpillar Electronic Technician (Cat ET) to the data link connector.
Disconnect the P2 ECM connector from the ECM.
Check the ECM connector for corrosion and for moisture.
Turn the keyswitch to the ON position.
Check for active diagnostic codes on Cat ET.Expected Result:The 5 volt diagnostic codes are not active. An open circuit diagnostic code is active for all of the analog sensors.Results:
OK - The 5 volt diagnostic codes are not active.Repair: Reconnect the P2 ECM connector. Proceed to Test Step 2.
Not OK - The 5 volt diagnostic codes are still active.Repair: Connect a test ECM.If the test ECM fixes the problem, reconnect the suspect ECM.If the problem returns, permanently install the new ECM.Verify that the repair eliminates the problem. Stop.Test Step 2. Disconnect the Sensors
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET.
Disconnect the analog sensors one at a time. Wait for 30 seconds after each analog sensor is disconnected.Note: The 5 volt diagnostic code will become inactive if a analog sensor is the cause of the 5 volt diagnostic code.
Ensure that all of the analog sensors are disconnected.Expected Result:The 5 volt diagnostic code is still active when all of the analog sensors are disconnected.Results:
OK - The 5 volt diagnostic code is still active.Repair: Leave all of the analog sensors disconnected. Proceed to Test Step 4.
Not OK - The 5 volt diagnostic code disappears when the analog sensors are disconnected. Repair: Reconnect all of the analog sensors except the suspect sensor. Proceed to Test Step 3.Test Step 3. Check the Signal Wire
Turn the keyswitch to the ON position.Note: The suspect sensor should be disconnected.
Measure the voltage between terminal C (Signal) and terminal B (Sensor Return) of the connector for the suspect sensor on the engine harness.Expected Result:The voltage is less than 7.0 VDC.Results:
OK - The voltage is within the range.Repair: Temporarily connect a new sensor.If the problem is resolved with the new sensor, reconnect the suspect sensor.If the problem returns, replace the suspect sensor.Verify that the repair eliminates the problem. Stop.
Not OK - The