Cat MT4400D AC Off-Highway Truck Advisor Monitoring System Caterpillar


Diagnostic Operation

Usage:

MT4400D AC MH4
A diagnostic code indicates that an ECM has detected one or more of the following conditions:

  • An invalid signal from an input

  • An improper feedback from an output

  • An internal error

Accessing Diagnostic Codes

Diagnostic information can be accessed with:

  • Cat® Electronic Technician (Cat ET).

  • Advisor

Note: Before performing a test procedure, always check all the circuit breakers. Repair the cause of any circuit breaker that is tripped.

Note: Test procedures may cause new diagnostic trouble codes to be logged. Defore any procedures are performed, make a list of all the active diagnostic trouble codes. Clear the diagnostic trouble codes that were caused by the procedure, after each procedure is complete.

Accessing With Cat® Electronic Technician (Cat ET)

Cat ET can be used to access diagnostic codes. The component identifier (CID) identifies the specific component and the failure mode identifier (FMI) identifies the type of diagnostic detected. The service tool displays the CID-FMI with descriptive text for each combination to help avoid mistakes in interpreting the codes.

To access the codes:

  1. Connect Cat ET to the machine.

  1. Turn on the key start switch

  1. Start Cat ET.

    Cat ET will initiate communications with the electronic control modules (ECMs) on the machine. After communication has been established, Cat ET will list the ECMs.

  1. Choose the desired ECM.

    Cat ET will list the codes.

  1. See the test procedure for the code.

Reference Troubleshooting, "Service Tools"

Diagnostic trouble codes can be:

  • Active

  • Logged

Active Diagnostic Trouble Codes




Illustration 1g02732497

Typical Cat ET active diagnostic trouble code screen

An active diagnostic trouble code screen is provided in Cat ET. Active diagnostic information includes:

  • Component identifier (CID)

  • Failure mode identifier (FMI)

  • Text description of the problem

Logged Diagnostic Trouble Codes




Illustration 2g02732498

Typical Cat ET logged diagnostic trouble code screen

A logged diagnostic trouble code screen is provided in Cat ET. Cat ET logs diagnostic trouble codes that are intermittent. The logged diagnostic data includes:

  • CID

  • FMI

  • Text description of the problem

  • Number of occurrences of the problem

  • Time stamp of the first occurrence of the problem

  • Time stamp of the most recent occurrence of the problem

Diagnostics are logged in non-volatile memory. On power-up, the ECM will clear any diagnostic trouble codes that have not been detected or active within the last 150 hours of machine operation.

Accessing With Advisor




Illustration 3g02850456

Typical Advisor screen for accessing diagnostics

Perform the following to access the diagnostics screen from the service menu:

  1. Use the appropriate arrow button to highlight the "Diagnostics" option.

  1. Press the buttons on the RH side to access the diagnostics screen.



    Illustration 4g02727932

    Typical active diagnostic screen

  1. Select "Active Events" to show a list of active diagnostics.



    Illustration 5g02727933

    Typical logged diagnostic screen

  1. Select "Logged Events" to show a list of logged diagnostic codes.

Each line in each list shows the following:

  • Component description

  • Warning level

Perform the following to access the codes and events from the diagnostics screen:

  1. Use the appropriate arrow button to highlight a specific code (line on the list).

  1. Press the RH button to display the detailed view of that line.

The detailed view will display a text message. The text message will include the following:

  • The reporting ECM (MID)

  • Identity of the component that has failed (CID)

  • Failure Mode Identifier (FMI)

  • An explanation of the failure

  • Number of active or logged events

  • A description of the component causing the fault

  • The fact that the code is currently active or logged

Note: The codes and the events that are displayed in the diagnostics option may be viewed at any time. Logged codes can be cleared with the Cat ET.

Active Diagnostics

If the Cat service tool is available, the service tool can display all active and logged diagnostic codes.

Logged Diagnostics

Logged diagnostics:

  • Record intermittent problems

  • Eliminate the need to duplicate intermittent problems

  • Increase diagnosis accuracy

  • Reduce troubleshooting time

  • Eliminate the need for trip recorders to capture intermittent diagnostic information

The ECM memory is used to store diagnostic information. When a diagnostic is detected, the following information is logged:

  • The CID will identify the component that has failed

  • The FMI will describe the problem

  • Number of occurrences of the diagnostic code

  • The time of the first occurrence that the diagnostic was detected

  • Last occurrence time, when the diagnostic was last detected (stored with both machine hours and RTC stamp)

The ECM logs the number of times that the machine is started using an unauthorized method.

Reference Machine Troubleshooting, "Diagnostic Trouble Codes" manual

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