KIT-HARDWARE 7X1029 - Caterpillar

Illustration 1 g02717491
Connections of the temperature sensor for the evaporator
This diagnostic code is recorded when the Implement ECM reads the input signal from the Evaporator Coil Temperature Sensor and the voltage is above normal.If the voltage of the sensor input circuit is greater than 4.95 VDC, an FMI 03 diagnostic code will be activated.Possible causes of the diagnostic code are listed:
There is an open in the sensor circuit.
The signal circuit is shorted to another circuit.
The sensor has failed.
The ECM has failed. This condition is unlikely.System Response:
Air conditioning will not work properly.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 of the connections in the circuit are clean and secure. 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 these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2357 FMI 03 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Test Step 1. CHECK FOR AN OPEN IN THE RETURN CIRCUIT
Turn the key start switch and the disconnect switch to the OFF position.
Locate the sensor and disconnect the machine harness from the sensor.
At the machine harness connector for the sensor, place a jumper wire from contact 6 wire 299-BK(Black)to frame ground.Note: Ensure that the frame ground contact point is clean and free of paint, oil, dirt, and any other debris.
Disconnect the machine harness connector J1 from the Implement ECM.
At the J1 machine harness connector for the ECM, measure the resistance from contact J1-70 wire 299-BK(Black)to frame ground.Note: Ensure that the frame ground contact point is clean and free of paint, oil, dirt, and any other debris.Expected Result:The resistance measurement is less than 5 ohms.Results:
OK - The resistance measurement is less than 5 ohms. Proceed to test step 2.
NOT OK - The resistance measurement is