CUTTING EDGE 4T2864 - Caterpillar

Illustration 1 g02625798
Schematic of the "OTG Oil Temperature" sensorThis diagnostic code is recorded when the ECM reads the signal wire of the temperature sensor and the voltage is high. The possible causes of this diagnostic code are listed below:
A shorted harness
An open supply circuit to the sensor
A failed sensor
An open circuit
The ECM may have failed. This is unlikely.Note: Ensure that the diagnostic code is still active.Note: The following procedure can create numerous related diagnostic codes. Reconnect all harnesses. Then, the related diagnostic codes will be shown as being NOT active. Complete the following procedure. Then, clear all of the related diagnostic codes.Test Step 1. CHECK THE SUPPLY VOLTAGE AT THE SENSOR.
Turn the disconnect switch and the key start switch to the ON position.
Check the voltage at the machine harness connector of the sensor from contact A (sensor supply) to contact B (ground). Do NOT disconnect the sensor. Use the 7X-1710 Cable probes to measure the voltage. Expected Result:The voltage should measure approximately 8 DCV.Results:
OK - The voltage is approximately 5 DCV. The voltage is correct. Proceed to test step 3.
NOT OK - The voltage is not approximately 5 DCV. There is an open in the machine harness or the ECM has failed. It is unlikely that the ECM has failed. Proceed to test step 2.Test Step 2. CHECK FOR AN OPEN IN THE SUPPLY CIRCUIT.
The key start switch and the disconnect switch remain in the ON position.
Disconnect the sensor from the machine harness.
At the machine harness connector for the sensor, measure the voltage from contact A (sensor supply) to frame ground.Expected Result:The voltage measures approximately 5 DCV.Results:
OK - The voltage measures approximately 5 DCV. The return circuit is open. Proceed to test step 3.
NOT OK - The voltage does not measure approximately 8 DCV. The supply circuit is open.Repair: Repair the machine harness or