ROLLER & BEARING GP 7T1259 - Caterpillar

Illustration 1 g02674336
Connections of the Hydraulic Oil Temperature Sensor
This diagnostic code is associated with the Hydraulic Oil Temperature Sensor. The FMI 04 means that the Implement ECM has determined that the voltage of the sensor signal circuit is below normal.The sensor resistance range is 33,650 ohms at −40° C (−40° F) to 18.6 ohms at 150° C (302° F). The following table indicates the approximate sensor resistance between contacts 1 and 2 at different sample temperatures.
Table 1
Hydraulic Oil Temperature Sensor Resistance at Indicated Temperatures
Oil Temperature Resistance (Ohms)
0° C (32° F) 3268
20° C (68° F) 1250
40° C (104° F) 532
70° C (158° F) 175
80° C (176° F) 126
90° C (194° F) 92
100° C (212° F) 68
115° C (239° F) 45
125° C (257° F) 34
130° C (266° F) 30 The possible causes of this diagnostic code are listed below:
The signal circuit for the sensor is shorted to ground.
The sensor has failed.
The machine ECM has failed. This condition is unlikely. Note: Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, that all connections are secure and that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Test Step 1. CHECK THE SENSOR
Turn the disconnect switch and the key start switch to the ON position.
Ensure that the diagnostic code is active.
Observe the status of the diagnostic code. Disconnect the sensor from the machine harness. Expected Result:The CID 0600 FMI 04 diagnostic code changes to a CID 0600 FMI 03 diagnostic code when the sensor is disconnected from the machine harness.Results:
YES - The CID 0600 FMI 04 diagnostic code changes to a CID 0600 FMI 03 diagnostic code when the sensor is disconnected. The sensor has failed.Repair: The sensor is causing the problem. Replace the temperature sensor.STOP
NO - Disconnecting the sensor from the machine harness did not change the status for the active diagnostic code. The CID 0600 FMI 04 diagnostic code is still active. The sensor is not causing the problem. Proceed to Test Step 2.Test Step 2. CHECK THE SENSOR CIRCUIT FOR A SHORTThe sensor remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector J1 and J2 from the Implement ECM.
At the machine harness connector for the ECM, measure the resistance from the signal contact J1-29 (wire 442-GY(Grey)) to frame ground. Measure the resistance from the signal contact J1-29 (wire 442-GY(Grey)) to all of the contacts that are used in the machine harness connectors for the Implement ECM. Expected Result:Each resistance measurement is greater