KIT-LATCH 3375863 - Caterpillar

Detailed FMI Explanation
FMI 00 "Data Valid But Above Normal Operating Range (Most Severe)" - Every electronic control system sets a high limit for the expected operating range of the signal. The high limit includes over range signals. This could be a high temperature. A sensor that is still operating but sending a signal above the expected limit will cause a FMI 00 to be activated. An FMI 00 is activated when the condition is a Level 3 condition (most severe).Some of the conditions that can cause the FMI 00 diagnostic code to be activated are:
The medium or component that is being monitored is above the normal range.
The signal is shorted to the another voltage source.
The sensor needs to be calibrated.
An ECM has failed. This is unlikely.FMI 01 "Data Valid But Below Normal Operating Range" - Every electronic control system sets a low limit for the expected operating range of the signal. The limit includes signals that are under the lower limit. The low signal could be the oil pressure signal. The sensor is still working but sending a signal below the expected limit will cause a FMI 01 to be activated. An FMI 01 is activated when the condition is a Level 3 condition (most severe).Some of the conditions that can cause the FMI 01 diagnostic code to be activated are:
The medium or component that is being monitored is above the normal range.
Poor connections in the circuit.
The sensor has failed.
An ECM has failed. This is unlikely.FMI 02 "Data erratic, intermittent or incorrect" - The signal from a component is present. The control that reads the diagnostic information can not read the signal properly. The signal appears to be gone, unstable or invalid. The data can be correct or incorrect intermittently. Also, this condition relates to communication between controls. This is an example of communication between controls. When the monitoring system is looking for the engine speed from the Engine ECM over the CAT Data Link.Some of the conditions that can cause the FMI 02 diagnostic code to be activated are:
There is a poor connection in the circuit.
The signal is intermittent or erratic.
The software has been changed.
The signal is receiving interference from another circuit.
The signal is out of the range.
An ECM has failed. This is unlikely.FMI 03 "Voltage Above Normal" - The component or system voltage is higher than the limit. An FMI 03 most often relates to a signal circuit.Some of the conditions that could cause a FMI 03 diagnostic code to be activated are listed below.
Loss of power supply.
A open circuit or a bad connection.
A short to another voltage source.
The sensor or the switch has failed.
An ECM has failed. This is unlikely.FMI 04 "Voltage Below Normal" - The component or system voltage is lower than the limit. An FMI 04 diagnostic code most often relates to a power supply circuit.Conditions that could cause a FMI 04 diagnostic code are listed below.
The circuit is shorted to a ground source.
The circuit is open or has a poor connection.
The ground