538, 548 and 558 Forest Machine Switch Circuits

Switch Circuits - Test

538, 548 and 558 Forest Machine [M0066266]

538, 548 and 558 Forest Machine Solenoid Valve (Switch Controlled) - Test

538, 548 and 558 Forest Machine Window Wiper Delay - Test

ELECTRICAL AND STARTING SYSTEM

SWITCH GP

538, 548 and 558 Forest Machine Relay - Test

538, 548 and 558 Forest Machine Switch Circuits - Test

538, 548 and 558 Forest Machine Window Wiper Delay - Test

1.1. Machine ECM

2.1. Diagnostic Trouble Code Procedure

Machine ECM

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

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Table 1
Machine ECM (MID 39)
DTC	Code Description	System Response
2913-3	Window Washer Switch: Voltage Above Normal	Switch will not function.
2913-6	Window Washer Switch: Current Above Normal	Switch will not function.

Possible causes for an FMI 3 diagnostic code are:

The switch has failed.
The common ground circuit is an open connection or the circuit has a bad connection.
There is an open or a bad connection in one or both of the switch input circuits.
The ECM has failed. ECM failure is unlikely.

Possible causes for an FMI 6 diagnostic code are:

A short to ground
The switch has failed.
The ECM has failed. A failure of the ECM is unlikely.

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Illustration 1	g06026552
Connections of the Window Washer Switch

The preceding diagram is a simplified schematic of the wiper control connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of the Electrical Schematic to view the entire circuitry of the machine.

Diagnostic Trouble Code Procedure

Prior to beginning this procedure, inspect the harness connectors that are 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. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this 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 6 diagnostic code, proceed to Table 3.

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Table 2
FMI 3 Troubleshooting
Troubleshooting Test Steps	Values	Results
1. Check The Ground Circuit For An Open A. Turn the disconnect switch and the key start switch OFF. B. Disconnect the switch from the machine harness. C. Measure the resistance between frame ground and the "washer" contact on the switch panel.	The reading is less than 5 Ω.	OK - The resistance is less than 5 Ω. Repair: Replace the module for the wiper control. Proceed to Test Step 2. NOT OK - The resistance is greater than 5K Ω. Repair: The "washer" circuit wire is open in the machine harness. 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 measurement that is greater than 5K Ω would indicate an open in the circuit. Proceed to Test Step 3.
2. Check The Signal Circuits In The Harness For An Open A. Reconnect the "wiper control" module to the machine harness. B. Disconnect the harness connectors from the switch panel. C. At the machine harness connector for the switch panel, check for continuity between "washer" contact and all sources of negative battery. D. Press the washer switch and release the switch. (Checking the switch for continuity.)	The continuity check is correct.	OK - The continuity check is correct. Proceed to Test Step 3. NOT OK - The continuity check is not correct. Repair: There is an open in the signal circuits of the machine harness. Repair or replace the machine harness. 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 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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Table 3
FMI 6 Troubleshooting
Troubleshooting Test Steps	Values	Results
1. Check the Ground Circuit Of The Switch In The Harness A. Turn key start switch and disconnect switch OFF. B. Disconnect the machine harness connectors from the switch panel. C. Measure the resistance between the "washer" connection on the switch panel and the ground contact.	The resistance is less than 5 Ω.	OK - The circuit is correct. Proceed to Test Step 2. NOT OK - The resistance is greater than 5K Ω. The circuit is open. 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 measurement that is greater than 5K Ω would indicate an open in the circuit. Proceed to Test Step 3.
2. Check The Switch Circuits For A Short To The Ground Circuit A. The machine harness connectors remain disconnected from the switch panel. B. Turn the disconnect switch and the key start switch OFF. C. Disconnect the machine harness connector from the "wiper control" module. At the switch panel harness connector, measure the resistance between the "washer" contact and all contacts used in the switch panel harness.	Each reading is greater than 5K Ω.	OK - The wiring harness is correct. Repair: Replace the "wiper control" module. Proceed to Test Step 3. NOT OK - One or more of the measurements were less than 5 Ω. A short exists in the wiring harness. 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 measurement 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 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.