5030461 JOHNSON WASHER, Water tube

Illustration 1 g00704125
Locations of the temperature sensors (typical side view)
Illustration 2 g00704168
Locations of the temperature sensors (typical top view)
Illustration 3 g00889686
Schematic for engine temperature sensorsTest Step 1. Verify All Active Diagnostic Codes.
Connect the Caterpillar Electronic Technician (Cat ET) to the data link connector.
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Verify if any of the following diagnostic codes are active:
110-03 Engine Coolant Temperature open/short to +batt
110-04 Engine Coolant Temperature short to ground
172-03 Inlet Manifold Air Temperature open/short to +batt
172-04 Inlet Manifold Air Temperature short to ground
174-03 Fuel Temperature Sensor open/short to +batt
174-04 Fuel Temperature short to ground
600-03 Hydraulic Oil Temperature open/short to +batt
600-04 Hydraulic Oil Temperature short to groundExpected Result:One or more of the preceding diagnostic codes are active.Results:
Yes - Proceed to Test Step 2.
No - Repair: If the preceding codes are logged but not active and the engine is not running properly, refer to Troubleshooting, "Troubleshooting without a Diagnostic Code". If the engine is running properly at this time, an intermittent condition may be causing the logged codes. Refer to Troubleshooting, "Electrical Connections - Inspect". Stop.Test Step 2. Inspect Electrical Connectors And Wiring.
Illustration 4 g00891306
Terminal locations for P1
Illustration 5 g00891307
Terminal locations for P2
Thoroughly inspect ECM engine harness connector J2/P2 and the suspect sensor connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the sensor connector and the ECM connector that are associated with the active diagnostic code.Refer to Illustration 5.
Verify that the latch tab of the connector is properly latched and that the latch tab of the connector has returned to the fully latching position.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the harness and wiring for abrasions and for pinch points from the sensor to the ECM.Expected Result:All connectors, pins, and sockets should be completely coupled and/or inserted. The harness and wiring should be free of corrosion, abrasion, and pinch points.Results:
OK - Proceed to Test Step 3.
Not OK - 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. Stop.Test Step 3. Verify That The Diagnostic Code Is Still Active.
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Access the "Active Diagnostic Code" screen of Cat ET. Check for active diagnostic codes.
Determine if the problem is related to an open circuit diagnostic code or a short circuit diagnostic code.Expected Result:A short circuit diagnostic code or an open circuit diagnostic code is active.Results:
SHORT Circuit - A short circuit diagnostic code is active at this time. Proceed to Test Step 4.
OPEN Circuit - An open circuit diagnostic code is active at this time. Proceed to Test Step 5.Test Step 4. Disconnect The 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.
Turn the keyswitch to the ON position. Wait at least 15 seconds for activation of the diagnostic codes.
Access the "Active Diagnostic Code" screen of Cat ET. Check for an active open circuit diagnostic code.Expected Result:An open circuit diagnostic code for the disconnected sensor is now active.Results:
OK - A short circuit diagnostic code was active before disconnecting the sensor. An open circuit diagnostic code became active after disconnecting the sensor. Proceed to Test Step 6.
Not OK - There is a short circuit between the sensor harness connector and the ECM. Leave the sensor disconnected. Proceed to Test Step 7.Test Step 5. Create A Short Circuit Between The Signal And The Common Terminals At The Sensor Connector.
Turn the keyswitch to the ON position.
Fabricate a jumper wire 150 mm (6 inch) long. Crimp a Deutsch terminal to both ends of the wire.
Monitor the "Active Diagnostic Code" screen before installing the jumper wire and after installing the jumper wire.
Install the jumper on the engine harness connector. Install one end of the jumper at the sensor signal (terminal 1). Install the other end of the jumper at the common connection for the engine temperature sensor (terminal 2). Wait at least 15 seconds for activation of the short circuit diagnostic code.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.
Verify that the repair eliminates the problem.
Clear all logged diagnostic codes. Stop.
Not OK - The open circuit diagnostic code remains active with the jumper in place. The most probable lo