Alarm - Test
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538, 548 and 558 Forest Machine
[M0066266]
538, 548 and 558 Forest Machine
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538, 548 and 558 Forest Machine
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ELECTRICAL AND STARTING SYSTEM
ALARM GP
538, 548 and 558 Forest Machine
Alarm - Test
1.1. Machine ECM
2.1. Diagnostic Trouble Code Procedure
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the travel alarm circuit of the machine.
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| Machine ECM (MID 299) | ||
| DTC | Code Description | System Response |
| 376-3 | Travel Alarm: Voltage Above Normal | The ECM will prevent the operator from engaging the machine in the reverse direction. |
| 376-5 | Travel Alarm: Current Below Normal | The ECM will prevent the operator from engaging the machine in the reverse direction. |
| 376-6 | Travel Alarm: Current Above Normal | The ECM will prevent the operator from engaging the machine in the reverse direction. |
Possible causes for an FMI 3 diagnostic code are:
- The travel alarm is shorted to a + battery source.
- The ECM has failed. A failure of the ECM is unlikely.
Possible causes for an FMI 5 diagnostic code are:
- The energize circuit of the travel alarm is open.
- The return circuit of the travel alarm is open.
- The travel alarm has failed.
- The ECM has failed. A failure of the ECM is unlikely.
Possible causes for an FMI 6 diagnostic code are:
- The travel alarm circuit is shorted to ground.
- The travel alarm has failed.
- The ECM has failed. A failure of the ECM is unlikely.
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| Illustration 1 | g03721200 |
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Travel Alarm Circuit connections | |
The preceding diagram is a simplified schematic of the Travel Alarm circuit. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of the Electrical Schematic for the complete machine circuitry.
Diagnostic Trouble Code Procedure
Prior to beginning this procedure, inspect the harness connectors involved in this 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. 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 3 diagnostic code, proceed to Table 2.
- FMI 5 diagnostic code, proceed to Table 3.
- FMI 6 diagnostic code, proceed to Table 4.
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| FMI 3 Troubleshooting | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Check The Signal Circuit For A Short A. Turn the key start switch and disconnect switch to the OFF position. B. Disconnect the harness connectors from the ECM. C. Disconnect the travel alarm from the machine harness. D. At the connector for the ECM, measure the resistance between the travel 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 signal circuit. Repair: Repair or replace machine harness. Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance value greater than 5K Ω indicates 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 to the ON position. 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 currently. 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 ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP |
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| FMI 5 Troubleshooting | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Check The Alarm A. Turn the key start switch and the disconnect switch to the OFF position. B. Disconnect the alarm from the machine harness. C. Place a jumper wire between contact 1 and contact 2, at the harness connector for the alarm. D. Turn the key start switch and the disconnect switch to the ON position. Do not start the engine. |
The FMI 5 diagnostic code changes to an FMI 6 after the jumper wire is installed. |
OK - The harness is correct. The FMI 5 diagnostic code changes to an FMI 6 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 to the OFFposition. B. Disconnect the harness connectors from the ECM. C. The jumper wire remains that was installed in the previous test step remains in place. D. At the machine harness connector for the ECM, 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 5K Ω. The machine harness circuit is open. Repair: The open is in the signal wire or the return wire. Repair or replace the machine harness. Note: A resistance greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance value that is greater than 5K Ω indicates 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 to the ON position. 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 currently. 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 ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP |
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| FMI 6 Troubleshooting | ||
|---|---|---|
| Troubleshooting Test Steps | Values | Results |
| 1. Check The Travel Alarm A. Turn the key start switch and disconnect switch to the ON position. Do NOT start the engine. B. Check that diagnostic code is active. C. Disconnect the travel alarm from machine harness. D. Observe the status of the diagnostic code. |
The FMI 6 changes to an FMI 5 when the alarm is removed. |
OK - The FMI 6 changes to an FMI 5 when the alarm is disconnected. The alarm has failed. Repair: Replace the travel 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 to the OFF position. B. The travel alarm remains disconnected from the harness. C. Disconnect all harness connections at the ECM. D. At the ECM harness connector, measure the resistance between the travel alarm contact and all possible sources of ground. |
All readings are greater than 5K Ω. |
OK - All resistance is greater than 5K Ω. Proceed to Test Step 3. NOT OK - One or more readings are 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 greater than 5 Ω but less than 5K Ω indicates a loose or corroded connection in the circuit. A resistance value greater than 5K Ω indicates 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 to the ON position . 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 currently. 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 ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP |
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