HEAD GP-CYL -B 0R4131 - Caterpillar

Table 1
The Quick Reference Table for the Operation of the Diagnostic Indicator    
Operation     Contact 1 (1)     Contact 3 (1)     Contact 5 (1)    
The code is placed on hold.     Open     Open     Open    
Scroll through the active diagnostic codes.     Ground (2)     Open     Open    
Clear (3) the diagnostic codes     Open     Ground     Open    
( 1 ) The contact is located in the connector for the harness code. Remove the harness code plug.
( 2 ) Remove the ground in order to stop scrolling. The diagnostic code will be placed on hold.
( 3 ) An active diagnostic code can not be cleared. The diagnostic code must be on hold in order to clear the diagnostic code.Use the following procedure when a problem is detected:When a diagnostic code is detected, the diagnostic indicator is illuminated. Determine the diagnostic code. Use table 2 in order to find the correct component failure. The code is flashed on the diagnostic indicator.Troubleshoot the diagnostic codes with the following procedures:
Illustration 1 g00842166
Harness code connector for the D3G through D5G machines
To enter service mode, disconnect the machine identification plug from the harness code connector. When the control module is in the service mode the control module's diagnostics are available in order to assist with troubleshooting.
A single diagnostic code is shown. The diagnostic code is on hold. Information is shown on the diagnostic indicator by flashing the indicator ON and OFF. The flashes represent a three digit number. A series of flashes represent the first digit. A one second pause follows the first digit. Another series of flashes represents the second digit. A one second pause follows the second digit. Another series of flashes represents the third digit. Count the number of flashes. The number of flashes determine each digit. A three second pause separates each three digit number. Use table 2 in order to find the correct CID.
When you scroll through the diagnostic codes, the codes for all of the active diagnostic codes are shown one at a time. Ground connector contact 1 in order to scroll through the active diagnostic codes. Remove the ground from connector contact 1 in order to stop scrolling. The diagnostic code that is shown is now on hold. A code of 222 indicates that diagnostic codes are NOT active or logged.
Perform the procedure that corresponds to the diagnostic codes.
Clearing a diagnostic code removes the diagnostic code from the control module's memory. When a problem is corrected, it is necessary to remove the diagnostic code from the memory of the control module. The diagnostic code must be on hold in order to clear an inactive diagnostic code. The control module does not allow active diagnostic codes to be cleared.
Place the diagnostic code on hold.
The diagnostic code is on hold. Ground connector contact 3 in order to remove the logged diagnostic code from the control module's memory. The diagnostic indicator is extinguished after the inactive diagnostic code