Troubleshooting

Table 86
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 dam-
aged 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 ac-
tive 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 op-
erating the PTO switches in one of the conditions
that are listed in Table 85 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 en-
gine 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.
(continued)
UENR0612-07 177
Circuit Tests
This document has been printed from SPI2. NOT FOR RESALE