GEAR AS-IDLER 2351418 - Caterpillar

Illustration 3 g00810608
Terminals for pressure sensors
Turn the keyswitch to the OFF position.
Disconnect the sensor from the engine harness.
Turn the keyswitch to the ON position.
Measure the voltage from terminal A (Engine Pressure Sensor +5V) to terminal B (Engine Pressure Sensor Common) on the engine harness side of the connector.Refer to Illustration 3.Expected Result:The DC voltage from terminal A to terminal B measures 4.5 to 5.5 VDC.Results:
OK - The sensor supply voltage is correct. Proceed to Test Step 8.
Not OK - The sensor supply voltage is out of range.Repair: Proceed to the following procedure: Troubleshooting, "5 Volt Engine Pressure Sensor Supply Circuit - Test" Stop.Test Step 7. Determine if the Short Circuit is in the Connector or in the Sensor
Thoroughly inspect the connector for moisture.
Inspect the seals and reconnect the sensor.
If the short circuit diagnostic code reappears, the sensor or the pigtail harness connector is the problem.
Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine.
Check for a short circuit diagnostic code while the new sensor is connected to the harness.Expected Result:The short circuit diagnostic code is not present when a new sensor is connected.Results:
OK - Verify that the repair eliminates the problem. Permanently install the new sensor. Clear the logged diagnostic codes. Stop.
Not OK - Repair the engine harness connector. Stop.Test Step 8. Create a Short Circuit Between the Signal and the Common Terminals at the Engine Harness Connector
Illustration 4 g00810608
Terminals for pressure sensors
Fabricate a jumper wire 150 mm (6 inch) long. Crimp a Deutsch terminal to both ends of the wire.
Turn the keyswitch to the ON position.
Monitor the "Active Diagnostic Code" screenon Cat ET before installing the jumper wire and after installing the jumper wire.
Install the jumper on the engine harness connector for the suspect sensor. Install one end of the jumper on terminal C (Signal). Install the other end of the jumper on terminal B (Common). Wait at least 15 seconds for activation of the short circuit diagnostic code.Refer to Illustration 4.Expected Result:A short circuit diagnostic code is active when the jumper is installed. An open circuit diagnostic code is active when the jumper is removed.Results:
OK - The engine harness and the ECM are OK.Repair: Perform the following repair:
Temporarily connect the suspect sensor.
If the diagnostic code remains active, replace the sensor.
Ensure that the diagnostic code is no longer active.
Verify that the repair eliminates the problem. Stop.
Not OK - The open circuit diagnostic code remains active when the jumper is installed. The most probable location for the open is in the sensor common or the sensor signal wire in the engine harness between the ECM and the sensor. Remove the jumper. Proceed to Test Step 9.Test Step 9. Check the Operation of the ECM by Creating Open and Short Circuits at the ECM Connector
Illustration 5 g00904084
ECM connectors (ECM side)
Turn the keyswitch to the OFF position.
Disconnect the J1/P1 ECM connector and the J2/P2 ECM connector. Thoroughly inspect both halves of the connectors for signs of corrosion or moisture.
Reconnect the J1/P1 and J2/P2 ECM connectors.
Remove