IDLER GP-FRONT 4564185 - Caterpillar

harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check the Supply Voltage at the Sensor Connector
Turn the keyswitch to the OFF position.
Disconnect all of the following analog sensors at the sensor connector:
Engine oil pressure sensor
Boost pressure sensor
Atmospheric pressure sensor
Fuel pressure sensor
Turn the keyswitch to the ON position.
Measure the voltage between terminal A (5 V analog supply) and terminal B (sensor return) at each of the sensor connectors.
Turn the keyswitch to the OFF position.
Reconnect all of the sensors.Expected Result:The voltage is 5.0 0.16 VDC.Results:
OK - The voltage is 5.0 0.16 VDC. The voltage is correct. Proceed to Test Step 3.
Not OK - The voltage is not 5.0 0.16 VDC. The voltage is incorrect.Repair: Perform the diagnostic functional test Troubleshooting, "5 Volt Engine Pressure Sensor Supply Circuit - Test".STOPTest Step 3. Check for Active Diagnostic Codes
Connect the electronic service tool to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes.Note: Wait at least 15 seconds in order for the diagnostic codes to become active.
Determine if the problem is related to an open circuit diagnostic code 03 or a short circuit diagnostic code 04.Expected Result:No diagnostic codes are active.Results:
OK - No diagnostic codes are active.Repair: The problem may have been related to a faulty connection in the harness. Carefully reinspect the connectors and wiring. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - A short circuit diagnostic code (04) is active at this time. Proceed to Test Step 4.
Not OK - An open circuit diagnostic code (03) is active at this time. Proceed to Test Step 5.Test Step 4. Disconnect the Suspect Sensor in Order to Create an Open Circuit
Turn the keyswitch to the OFF position.
Disconnect the sensor connector of the sensor with the short circuit diagnostic code (04).
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Access the "Active Diagnostic Code" screen on the electronic service tool. Check for an active open circuit diagnostic code (03).
Turn the keyswitch to the OFF position.Expected Result:An open circuit diagnostic code 03 is now active for the disconnected sensor.Results:
OK - A short circuit diagnostic code (04) was active before disconnecting the sensor. An open circuit diagnostic code (03) became active after disconnecting the sensor.Repair: Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine. Verify that there are no active diagnostic codes for the sensor. If there are no active diagnostic codes for the sensor, permanently install the new sensor. Clear any logged diagnostic codes.STOP
Not OK - There is a short circuit between the sensor harness connector