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


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 window wiper delay circuit of the machine.

Table 1
Machine ECM (MID 299) 
DTC  Code Description  System Response 
287-3  Low Current Digital Output 7: Voltage Above Normal  The window wiper system will fail to function when requested. 
287-6  Low Current Digital Output 7: Current Above Normal  The window wiper system will fail to function when requested. 
288-3  Low Current Digital Output 8: Voltage Above Normal  The window wiper system will fail to function when requested. 
288-6  Low Current Digital Output 8: Current Above Normal  The window wiper system will fail to function when requested. 

Note: 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. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.

Possible causes for an FMI 3 diagnostic code are:

  • The energize circuit is shorted to another voltage source.

  • The switch panel has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 6 diagnostic code are:

  • The energize circuit of the module is shorted to a ground source.

  • The control module has failed.

  • The switch panel has failed.

  • The ECM has failed. A failure of the ECM is unlikely.


Illustration 1g06026600
Schematic for the Window Wiper Control Module

The preceding diagram is a simplified schematic of the wiper delay circuit 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. If a problem with a connection is found, correct the problem and verify that the diagnostic code is active before performing a troubleshooting procedure.

  1. Identify the active FMI code associated with the components.

  2. 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.

Table 2
FMI 3 Troubleshooting 
Troubleshooting Test Steps  Values  Results 
1. Check The Machine Harness For A Short

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect all harness connectors from the switch panel.

C. Disconnect the wiper control module from the machine harness.

D. At the switch panel, identify the wiper intermittent pin locations (refer to the schematic above).

E. Measure the resistance between the wiper intermittent connectors on the switch panel and all other contacts of the switch panel. 

Each reading is greater than 5K Ω. 
OK - All measurements are greater than 5K Ω.

Proceed to Test Step 2.

NOT OK - Resistance is less than 5 Ω. A short exists between the signal circuit and the circuit with the low-resistance measurement.

Repair: Repair or replace 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 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 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. 

Table 3
FMI 6 Troubleshooting 
Troubleshooting Test Steps  Values  Results 
1. Check The Control Module

A. Turn the key start switch and disconnect switch to the ON position.

B. Disconnect the wiper module from the machine harness.

C. At the machine harness for the wiper module, place a jumper wire between one of the intermittent wiper delay signals and ground. 

The diagnostic code is no longer active. 
OK - The diagnostic code is no longer active.

The wiper module has failed.

Repair: Replace the wiper control module.

NOT OK - The diagnostic code remains active.

Proceed to Test Step 2. 
2. Check The Signal Circuit For A Short To Ground

A. The key start switch and disconnect switch remain in the OFF position.

B. Remove the jumper wire that was installed in the previous test step.

C. Disconnect all harness connections at switch panel.

D. At the switch panel harness connector, measure the resistance between the signal contacts and all possible sources of ground.
 

All resistance values are greater than 5K Ω. 
OK - All resistance values are greater than 5K Ω.

Proceed to Test Step 3.

NOT OK - One or more readings are less than 5 Ω.

Repair: The short is between the signal contact and the circuit with the low resistance. 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. 

Information System:

538, 548 and 558 Forest Machine Switch Circuits - Test
538, 548 and 558 Forest Machine Solenoid Valve (Switch Controlled) - Test
538, 548 and 558 Forest Machine Solenoid Valve - Test
538, 548 and 558 Forest Machine Sensor Supply - Test
CB44B and CB54B Vibratory Asphalt Compactors Machine Systems Flow Control Valve (Steering)
538, 548 and 558 Forest Machine Alarm - Test
538, 548 and 558 Forest Machine CAN Data Link - Test
538, 548 and 558 Forest Machine Electrical Power Supply - Test
307E2 Mini Hydraulic Excavator Machine Systems Main Control Valve - Disassemble
415IL Backhoe Loader Power Train Axle Housing, Axle Shaft, and Wheel Flange - Assemble - Rear Axle
538, 548 and 558 Forest Machine Relay - Test
538, 548 and 558 Forest Machine Sensor Signal (Analog, Passive) - Test
415IL Backhoe Loader Power Train Axle Housing, Axle Shaft, and Wheel Flange - Install - Rear Axle
PM620, PM622, PM820, PM822 and PM825 Cold Planers Electronic System ECM Location Code - Test
PM620, PM622, PM820, PM822 and PM825 Cold Planers Electronic System Sensor Signal (Analog, Passive) - Test
PM620, PM622, PM820, PM822 and PM825 Cold Planers Electronic System Solenoid Return - Test
PM620, PM622, PM820, PM822 and PM825 Cold Planers Electronic System Condition Switch (Switch to Ground) - Test
415F2 Industrial Loader Power Train Axle Housing (Service Brakes, Differential and Bevel Gear) - Disassemble
415F2 Industrial Loader Power Train Axle Housing (Service Brakes, Differential and Bevel Gear) - Assemble
415F2 Industrial Loader Power Train Tire and Rim (Front) - Remove and Install
340F Excavator Safety Messages
415F2 Industrial Loader Power Train Tire and Rim (Rear) - Remove and Install
340F Excavator Boom/Stick/Bucket Combinations
CB7, CB8 and CB10 Vibratory Asphalt Compactors Machine Systems Air Conditioner Lines