VALVE GP-BYPASS 3243255 - Caterpillar

Machine ECM
The following code is associated with the engine speed dial related to the Machine ECM.
Table 1
Machine ECM (MID 299)
DTC Code Description System Response
586-12 Engine Speed Dial Switch : Bad device or component Cannot control engine speed. Possible causes for an FMI 12 diagnostic code are:
The dial switch has failed.
The engine governor control has failed.
The CAN Data Link between the Switch Panel and the Machine ECM is working intermittently or has failed.
The machine harness to the dial switch or the governor control has failed.
The ECM has failed. This situation is unlikely.
Illustration 1 g03703255
Schematic of the Engine Speed (Governor control)
Note: The diagram above is a simplified schematic of the Machine ECM and the Engine Speed Dial. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical System Schematic, UENR5948.Diagnostic Trouble Code Procedure
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.Note: The speed dial switch is integrated into the housing for the Switch Panel. If the diagnostic code is accompanied by a CID 246 (data link) diagnostic code, the troubleshooting for the data link should be performed first. If, after troubleshooting the data link, if DTC 586-12 is active, the Switch Panel should be replaced. If the code continues to be active, refer to Illustration 1. Follow the procedure outlined in Table 2 for all troubleshooting.
Table 2
Troubleshooting Test Steps Values Results
1. Check For An Active Diagnostic Code
A. Turn the key start switch to the ON position.
B. Use Cat ET to check for all active diagnostic codes.
B. Check for DTC 586-12.
C. Check for DTC 246-9 or DTC 246-19.
Diagnostic code CID 586 FMI 12 is active. OK - DTC 586-12 is active without either DTC 246-9 or DTC 246-19 being active.
Proceed to Test Step 2.
NOT OK - Diagnostic code DTC 586-12 AND DTC 246-9 or DTC 246-19 are active.
Repair: Follow the procedure for troubleshooting the code for the data link circuit.
Result: If DTC code 586-12 is no longer active, return the machine to service.
If, after troubleshooting the data link, DTC 586-12 is active, proceed to Test Step 2.
2. Inspect The Switch Panel Harness Connection
A. Turn the disconnect switch to the OFF position.
B. Inspect the harness connector making sure that the connector is clean and tight.
C. Check the connector for proper mating.
D. Check the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector.
E. Check any exposed wires at the connector for nicks or signs of abrasion.
F. Check for moisture inside the connector.
G. Check the connector for dirty contacts or corroded contacts.
H. Check each pin and each socket of the switch