Usage:
Service Code Lists
System events from electronic control modules other than VIMS modules are shown on the VIMS message center. Other electronic control modules transfer this diagnostic information by way of the CAT data link to the VIMS main module.
The Module Identifier (MID) code identifies which electronic control module detected the fault. Each electronic control module on the machine has a unique MID code. Use the following chart to match the MID code for each fault, to an electronic control module. After determining which electronic control module detected the fault, see the service manual module for that control for troubleshooting information (CID/FMI). The service manual modules for each control are part of the machine Service Manual.
NOTE: System events that originate in other electronic controls are cleared from those controls when the event is transferred to VIMS. This does not apply to machine events.
Component Identification (CID)
The Component Identifier (CID) is a code that describes the component that is believed faulty. It must be used with the MID and FMI to get the whole story as to what circuit or component needs attention.
Failure Mode Identifier
Failure Mode Identifier (FMI) codes are defined by the Society of Automotive Engineers® (SAE) standards. The definitions listed are those of Caterpillar as it applies to our product. The following diagram will help understand FMI use with sensors like frequency (transmission output speed), analog (engine control) and digital (PWM).
FMI 00 - Data Valid But Above Normal Operating Range. Every electronic control system sets a high limit for the "expected" operating range of the signal. The limit includes over ranges like high converter temperatures. A sensor that is still working but sending a signal above the expected limit will be stored as a FMI 00.
Example - A certain PWM sensor is not expected to generate a valid signal over 80 percent duty cycle. If a sensor generates an 81 percent duty cycle, it is still working but is now above the expected signal limits.
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 under ranges like low engine oil pressure. A sensor that is still working but sending a signal below the expected limit will be stored as a FMI 01.
Example - Most PWM sensors are not expected to generate a valid signal beneath 5 percent duty cycle. If a sensor generates a 3 percent duty cycle, it is still working but is now beneath the expected signal limits.
FMI 02 - Data Erratic, Intermittent Or Incorrect. Signal data from a component is present. Then the signal is either gone, unstable or invalid as recognized by the control doing diagnostics. Data can be correct sometimes and not at other times. Also relates to communication between controls. Such as when VIMS is looking for engine speed from the electronic engine control over the CAT data link.
FMI 03 - Voltage Above Normal Or Shorted High. The voltage identified is HIGHER than expected from the component or system (like sensor power) that the CID identifies. FMI 03 most often relates to a signal circuit.
The responsible elements of the system can be:
The sensor.
The harness.
A related electronic control.
The possible causes of FMI 03 can be:
A sensor that does not generate an alternating signal (duty cycle) and the output stops "high" or at maximum signal output.
A harness with the sensor signal wire shorted to the sensor power supply or shorted to any voltage greater than the sensor power supply voltage.
An open sensor signal wire between the sensor and the control. Electronic controls normally "pull" the input circuit to a positive voltage level. Such as 5.0 DCV when the sensor is disconnected.
A faulty control where the connector contact of the sensor signal is internally shorted to a positive source. Also, a faulty control (very unlikely) that believes a fault exists when the circuit is actually working correctly.
FMI 04 - Voltage Below Normal Or Shorted Low. Reference FMI 03 except voltage is LOWER than expected. Very similar to FMI 06 and sometimes used instead of FMI 06.
The responsible elements of the system can be:
The sensor.
The harness.
A related electronic control.
The possible causes of FMI 04 can be:
Sensor signal stops "low" or near ground.
Harness signal wire is shorted to ground.
Electronic control has internal short to ground on connector contact of signal input.
FMI 05 - Current Below Normal Or Open Circuit. The control detects that the current in the monitored circuit described by the CID is less than expected and usually results from an open circuit. Most often FMI 05 is related to a control output circuit.
FMI 06 - Current Above Normal Or Grounded Circuit. Same as FMI 05 except current is higher than expected. For example, when a circuit is shorted to ground. Very similar to FMI 04 and sometimes used instead of FMI 04.
FMI 07 - Mechanical System Not Responding Properly. When an electronic control sends an electrical command or output to a mechanical system and the result is not as expected.
Example - Slow shifting of ICM transmission (EPTCII) caused by a sluggish solenoid valve.
FMI 08 - Abnormal Frequency, Pulse Width Or Period. When the signal frequency, or width of a given signal pulse, is not in the expected range. Note: Period is the time in seconds for one cycle at a given frequency or repetition rate. Period is defined as 1/frequency in Hz. Can also relate to a faulty or open sensor output circuit.
FMI 09 - Abnormal Update. Relates to communication between electronic controls on a data link. FMI 09 occurs when a given control is not able to get information from another when the data is required or expected. Module may be faulty.
FMI 10 - Abnormal Rate Of Change. Relates to a signal that changes at a rate faster/slower than expected. The rate of change, not the maximum or minimum value, is outside of the expected limits.
Example - When the signal from a transmission output speed sensor (ground speed) on an OHT indicates the machine is accelerating (or decelerating) faster than could possibly occur during actual operation.
FMI 11 - Failure Mode Not Identifiable. Relates to a signal where the electronic control identifies more than one FMI as responsible for a single fault.
FMI 12 - Bad Device Or Component. Describes a condition where an electronic control sends a signal to another electronic module over a data link and expects a response but gets no response or the response is incorrect. Also applies to a condition where a module is expected to send data periodically and does not. Could also relate to a faulty data link. Also relates to control self diagnostics where the control believes it is defective. This could result from a software mismatch (wrong change level) between controls.
FMI 13 - Out Of Calibration. For a given mechanical condition, the electrical signal is not within the limits the electronic control expects. The sensor needs calibration, adjustment or replacement.
FMI 14 - 20 - Parameter Failures. These events are failures related to parameter information (not hardware) and communication between electronic control modules. When these failures occur while in gauge mode of the message center, push the F1 key to obtain more information.
For detailed information on service codes and VIMS, see SENR6059, Service Manual, Vital Information Management System (VIMS).