ADAPTER-CONNECTOR 3118739 - Caterpillar

Illustration 1 g02028844
Connections of the transmission oil level sensorThis diagnostic code is associated with the transmission oil level sensor. The FMI 03 means that the ECU has determined that the signal for the transmission oil level sensor is being shorted to a voltage. The sensor produces a voltage signal.Possible causes of the diagnostic code is listed:
The supply circuit to the sensor is open.
The return circuit is open.
The signal circuit is shorted to the +battery.
The signal circuit is open or the sensor is disconnected.
The sensor has failed.
The ECU has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0124 FMI 03 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Test Step 1. CHECK THE VOLTAGE AT THE SENSOR.
Turn the disconnect switch and the key start switch to the ON position.
Disconnect the sensor from the machine harness.
At the machine harness connector for the sensor, measure the voltage between contact A (wire 709-OR) and contact B (wire 202-BK).Expected Result:The voltage should measure approximately 5 VDC.Results:
OK - The voltage is approximately 5 VDC. Proceed to test step 4.
NOT OK - The voltage is not approximately 5 VDC. Repair: There is a problem with the machine harness or the ECU has failed. It is unlikely that the ECU 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.
The sensor remains disconnected from the machine harness.
At the machine harness connector for the sensor, measure the voltage from contact A (wire 709-OR) to ground.Expected Result:The voltage should measure approximately 5 VDC.Results:
OK - The voltage measurement is approximately 5 VDC. Proceed to test step 3.
NOT OK - The voltage does not measure approximately 5 VDC.Repair: The supply circuit is not correct. Repair the circuit or replace the circuit.STOPTest Step 3. CHECK FOR AN OPEN IN THE RETURN CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
The sensor remains disconnected from the machine harness.
Disconnect the machine harness connector J1 from the ECU.
At the machine harness connector for the sensor, install a jumper wire from contact B (wire 202-BK) to ground.
At the machine harness connector for the ECU, measure the resistance from contact J1-70 (wire 202-BK) to ground.Expected Result:The resistance measurement should measure less than 5000 ohms.Results:
OK