FASTENER 5147299 - Caterpillar

Illustration 1 g03729581
Schematic diagram for the PTO switches
Not all connectors are shown. Refer to the Electrical Schematic for the application.
Illustration 2 g02690278
View of the pin locations on the P1 connector for the PTO switches
(9) PTO mode - OFF
(10) PTO mode - resume
(31) PTO mode - raise
(32) PTO mode - lower
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Check the fuses.
C. Perform a 30 N (6.7 lb) pull test on each wire in the PTO switch connectors and on each wire in the ECM connector that is associated with the PTO switches.
D. Check the harness for corrosion, abrasion, and pinch points from the PTO switches to the ECM and the battery supply.
Damaged wire or connector
Result: A damaged wire or damaged connector was not found. The fuses are OK.
Proceed to Test Step 2.
Result: A damaged wire or damaged connector was found. A fuse is blown.
Repair: Repair the damaged wire or the damaged connector. Replace any blown fuses.
Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault.
2. Check for Active Diagnostic Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position.
D. Check the "Active Diagnostic Codes" screen. Look for an active or recently logged 976-2 diagnostic code.
Diagnostic Trouble Codes
Result: A 976-2 diagnostic code is active.
Proceed to Test Step 3.
Result: A 976-2 diagnostic code is recently logged.
Repair: The logged code may be caused by operating the PTO switches in one of the conditions that are listed in Table 1 or an intermittent fault may exist.
Refer to Troubleshooting, "Electrical Connectors - Inspect" in order to identify intermittent faults.
Result: There is no active or recently logged 976-2 diagnostic code.
If the switches are not operating correctly, an open circuit may exist.
Proceed to Test Step 3.
3. Check the PTO Mode Switches on the Electronic Service Tool
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic connector.
C. Turn the keyswitch to the ON position.
D. Observe the status of the PTO switch on the electronic service tool while the PTO on/off switch is cycled.
E. Use the electronic service tool in order to observe the status of the PTO mode switch while the PTO lower/raise switch is cycled.
F. Use the electronic service tool in order to observe the status of the PTO switch while the PTO Resume switch is cycled.
Switch status
Result: The status of each switch changes when the switch is operated.
The fault appears to be resolved. Return the engine to service.
Result: One of the switches indicates "OPEN" even when the switch is pressed.
Proceed to Test Step 4.
Result: One of the switches indicates "CLOSED" even when the switch is not pressed.
Proceed to Test Step 6.
4. Check the Power Supply to the Suspect Switch
A. Turn the keyswitch to the OFF position.
B. Disconnect the battery supply wire from the suspect switch.
C. Turn the keyswitch to the ON position.
D. Check the voltage between the battery supply