TANK AS-COOLANT 1690152 - Caterpillar

Illustration 1 g06189552
Schematic for the Forward and Reverse Current Sensors
This diagnostic code is associated with the Magnet Reverse Current (CT1). The FMI 03 diagnostic code means that the ECM has determined that the voltage of the input circuit for the current sensor is above normal.The possible causes of the diagnostic code are listed below:
The sensor has failed.
The sensor supply in the controller harness is open.
The ground circuit in the controller harness is open.
The signal circuit in the controller harness is open.
The signal circuit of the controller harness is shorted to the +battery circuit.
The sensor is disconnected.
The ECM has failed. This situation 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 SPN 5009 FMI 03 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:The machine response is listed below:
Overload Protection for the Control Panel is disabled.Note: Before performing this procedure, verify that all circuit breakers and fuses in the charging circuit and the ECM system supply circuit are closed. If a problem with a circuit breaker or a fuse is found, correct the problem. Verify that this diagnostic code is active before performing this procedure.Test Step 1. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Turn the disconnect switch and the key start switch to the OFF position.
Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation that is caused by excessive heat, corrosion, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Use the Cat Electronic Technician (ET) service tool to perform a “Wiggle Test” on the machine wiring harness. The wiggle test can detect intermittent shorts or opens in the machine wiring harness.
Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are fastened securely.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the SPN 5009 FMI 03 diagnostic code is still active.Expected Result:The SPN 5009 FMI 03 diagnostic code is still active.Results:
YES - The SPN 5009 FMI 03 diagnostic code remains active. Proceed