F15160 Force INSULATOR WASHER

Illustration 1 g01095363
Schematic for transmission oil temperature sensor
Test Step 1. INSPECT THE ELECTRICAL CONNECTORS AND THE WIRING
Turn the keyswitch to the OFF position.
Illustration 2 g01153451
C12 model view (left side engine view)
(1) P137 Transmission oil temperature sensor connector
(2) J2/P2 ECM connector
Illustration 3 g01153452
3406E, C15, and C18 model view (left side engine view)
(1) P137 Transmission oil temperature sensor connector
(2) J2/P2 ECM connector
Thoroughly inspect connectors (1) and (2). Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 4 g01094223
P2 ECM connector for transmission oil temperature sensor
(P2-17) Transmission oil temperature sensor signal
(P2-41) Sensor return
(P2-42) +5 V sensor supply
Illustration 5 g01094844
Terminals for the temperature sensor
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the sensor connectors that are associated with the active diagnostic code.
Check the allen head screw for each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the harness and wiring for abrasions and for pinch points from the sensor back to the ECM. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and wiring appear to be 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 the transmission oil temperature sensor at the sensor connector:
Turn the keyswitch to the ON position.
Measure the voltage between terminal P137-A (+5 V supply) and terminal P137-B (sensor return) at the sensor connectors.
Turn the keyswitch to the OFF position.
Connect all sensor connectors. Expected Result:The voltage is 5.0 0.2 VDC.Results:
OK - The voltage is 5.0 0.2 VDC. The voltage is correct. Proceed to Test Step 3.
Not OK - The voltage is not 5.0 0.2 VDC.Repair: The voltage is incorrect. Perform the diagnostic functional test Troubleshooting, "5 Volt Engine Pressure Sensor Supply Circuit - Test".STOPTest Step 3. CHECK FOR ACTIVE DIAGNOSTIC CODES
Connect the Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools".
Turn the keyswitch to the ON position.
Use Cat ET to check for active diagnostic codes. Wait at least 15 seconds so that any codes may become active. Look for an active diagnostic code for the transmission oil temperature sensor.
Check for the following active diagnostic codes:
177-03
177-04Expected Result:No diagnostic codes are active for the transmission oil temperature sensor.Results:
OK - No diagnostic codes are active for the transmission oil temperature sensor.Repair: The problem may have been related to a faulty connection in the harness. Carefully inspect the connectors and wiring for problems that could cause an intermittent problem. Refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The 177-04 diagnostic code is active at this time. Proceed to Test Step 4.
Not OK - The 177-03 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 connector for the transmission oil temperature sensor.
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 Cat ET. Check for an active 177-03.
Turn the keyswitch to the OFF position. Expected Result:The 177-03 diagnostic code is now active.Results:
OK - The 177-04 diagnostic code was active before disconnecting the sensor connector. A 177-03 diagnostic code 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 and the ECM. Leave the sensor disconnected. Proceed to Test Step 8.Test Step 5. CHECK THE PULL-UP VOLTAGE AT THE SENSOR CONNECTOR
Turn the keyswitch to the ON position.
Measure the voltage between terminal P137-C (transmission oil temperature sensor signal) and terminal P137-B (sensor return) at the sensor connector.
Turn the keyswitch to the OFF position. Expected Result:The voltage is 11 2 VDC.Results:
OK - The voltage is within specifications.Repair: The signal wire to the ECM from the sensor connector is OK. The open circuit is in the sensor or the wire between the sensor and the sensor connector. Replace the sensor. Do not install the sensor in the engine. Verify that no diagnostic codes are ac