16M3 and 18M3 Motor Graders Information Display Caterpillar

Alarm - Test

Usage:

18M3 E9W

Graphical Display

Show/hide table




Illustration 1	g03876823

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the alarm circuits of the machine.

Show/hide table

Table 1
Graphical Display (MID 053)
DTC	Code Description	System Response
271-03	Action Alarm: Voltage Above Normal	Action Alarm - Test
271-05	Action Alarm: Current Below Normal	Action Alarm - Test
271-06	Action Alarm: Current Above Normal	Action Alarm - Test

The alarm is an output of the Monitoring System Display that is used to alert the operator of a fault condition (fault alarm).

Possible causes for an FMI 03 diagnostic code are:

The alarm is shorted to a + battery source.
The Indication Display has failed. A failure of the Indication Display is unlikely.

Possible causes for an FMI 05 diagnostic code are:

The energize circuit of the alarm is open.
The return circuit of the alarm is open.
The alarm has failed.
The Indication Display has failed. A failure of the Indication Display is unlikely.

Possible causes for an FMI 06 diagnostic code are:

The alarm circuit is shorted to ground.
The alarm has failed.
The Indication Display has failed. A failure of the Indication Display is unlikely.

Diagnostic Trouble Code Procedure

Note: Prior to beginning 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 connections in the circuit are clean, secure, and in good condition. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.

Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.

FMI 03 diagnostic code, proceed to Table 2.
FMI 05 diagnostic code, proceed to Table 3.
FMI 06 diagnostic code, proceed to Table 4.

Show/hide table

Table 2
FMI 03 Troubleshooting
Troubleshooting Test Steps	Values	Results
1. Check The Signal Circuit For A Short A. Turn the key start switch and disconnect switch OFF. B. Disconnect the harness connectors from the Indication Display. C. Disconnect the action alarm from the machine harness. D. At the connector for the Indication Display, measure the resistance between the action alarm contact and all sources for +battery.	Each value is greater than 5K Ω.	OK - Each value is greater than 5K Ω. Proceed to Test Step 2. NOT OK - Resistance is less than 5 Ω, a short exists in the signal circuit. Repair: Repair or replace machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose or corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Proceed to Test Step 2.
2. Check If The Diagnostic Code Remains A. Reconnect all harness connectors. Return machine to normal operating condition. B. Turn the key start switch and the disconnect switch ON. C. Clear all diagnostic codes. D. Operate the machine. E. Stop the machine and engage the safety lock lever. F. Check if the diagnostic code is active.	The diagnostic code is no longer present.	OK - The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. NOT OK - The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the Indication Display may require replacement. Prior to replacing the Indication Display, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may affect repair time. STOP.

Show/hide table

Table 3
FMI 05 Troubleshooting
Troubleshooting Test Steps	Values	Results
1. Check The Alarm A. Turn the key start switch and the disconnect switch OFF. B. Disconnect the alarm from the machine harness. C. Place a jumper wire between contact 1 and contact 2, at the alarm's harness connector. D. Turn the key start switch and the disconnect switch ON. Do Not start the engine.	The FMI 05 diagnostic code changes to an FMI 06 after the jumper wire is installed.	OK - The harness is correct. The FMI 05 diagnostic code changes to an FMI 06 when the jumper wire is installed. The alarm has failed. Repair: Replace the alarm. Proceed to Test Step 3. NOT OK - The diagnostic code remains active. Proceed to Test Step 2.
2. Check The Harness For An Open A. Turn the key start switch and the disconnect switch OFF. B. Disconnect the harness connectors from the Indication Display. C. The jumper wire remains that was installed in the previous test step remains in place. D. At the machine harness connector for the Indication Display, measure the resistance between the signal contact and ground contact.	Each reading is less than 5 Ω.	OK - The reading is less than 5 Ω. The harness is correct. Proceed to Test Step 3. NOT OK - The reading is greater than 5 KΩ. There is a circuit open in the machine harness. Repair: The open is in the signal wire or the return wire. Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Proceed to Test Step 3.
3. Check If The Diagnostic Code Remains A. Reconnect all harness connectors. Return machine to normal operating condition. B. Turn the key start switch and the disconnect switch ON. C. Clear all diagnostic codes. D. Operate the machine. E. Stop the machine and engage the safety lock lever. F. Check if the diagnostic code is active.	The diagnostic code is no longer present.	OK - The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. NOT OK - The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the Indication Display may require replacement. Prior to replacing the Indication Display, contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may affect repair time. STOP.

Show/hide table

Table 4
FMI 06 Troubleshooting
Troubleshooting Test Steps	Values	Results
1. Check The Action Alarm A. Turn the key start switch and disconnect switch ON. Do NOT start the engine. B. Check that diagnostic code is active. C. Disconnect the action alarm from machine harness. D. Observe the status of the diagnostic code.	The FMI 06 changes to an FMI 05 when the alarm is removed.	OK - The FMI 06 changes to an FMI 05 when the alarm is disconnected. The alarm has failed. Repair: Replace the action alarm. Proceed to Test Step 3. NOT OK - The diagnostic code does not change when the alarm is disconnected from the harness. Proceed to Test Step 2.
2. Check The Signal Circuit For A Short To Ground A. Turn the key start switch and disconnect switch OFF. B. The action alarm remains disconnected from the harness. C. Disconnect all harness connections at the Indication Display. D. At the Indication Display harness connector, measure the resistance between the action alarm contact and all possible sources of ground.	All readings are greater than 5K Ω.	OK - All resistance greater than 5K Ω. Proceed to Test Step 3. NOT OK - At least one reading is less than 5 Ω. The short is between the signal contact and the circuit with the low resistance value. Repair: Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance value that is greater than 5K Ω would indicate an open in the circuit. Proceed to Test Step 3.
3. Check If The Diagnostic Code Remains A. Reconnect all harness connectors. Return machine to normal operating condition. B. Turn the key start switch and the disconnect switch ON. C. Clear all diagnostic codes. D. Operate the machine. E. Stop the machine and engage the safety lock lever. F. Check if the diagnostic code is active.	The diagnostic code is no longer present.	OK - The diagnostic code does not exist at this time. The initial diagnostic code may have been caused by a poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. NOT OK - The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the Indication Display may require replacement. Prior to replacing the Indication Display, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may affect repair time. STOP.