Table 203
Troubleshooting Test Steps
Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Thoroughly inspect the J1/P1 connectors on the Electronic
Control Module (ECM), the switch connections and battery
connections. Refer to Troubleshooting, “Electrical Connectors
- Inspect” for details.
C. Perform a 45 N (10 lb) pull test on each of the wires in the
switch connector and the ECM connector that are associated
with the active diagnostic code. Refer to Illustration 127 .
D. Check the screw for the ECM connector for the correct tor-
que of 6 N·m (53 lb in).
E. Check the harness for corrosion, abrasion, and pinch points
from the PTO mode switches to the ECM.
Loose connection or
damaged wire
Result: There is a fault in a connector or the wiring.
Repair: Repair any faulty connectors or replace the wir-
ing harness. Ensure that all of the seals are properly in
place and ensure that the connectors are correctly
coupled.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: All connectors, pins, and sockets are correctly
coupled and/or inserted. The harness is free of corro-
sion, abrasion, and pinch points.
Proceed to Test Step 2.
2. Check the ““PTO Mode Switches”” on the Electronic Serv-
ice 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 mode switch on the elec-
tronic service tool while cycling the PTO ON/OFF switch.
E. Use the electronic service tool in order to observe the status
of the PTO mode switch while cycling the PTO Set/Lower
switch.
F. Use the electronic service tool in order to observe the status
of the PTO mode switch while cycling the PTO Raise/Resume
switch.
Switch status
changes from
“OPEN” to
“CLOSED”
Result: The switch status changes on the electronic
service tool as the PTO switches are cycled.
Use the electronic service tool to clear all logged diag-
nostic codes. Return the engine to service.
Result: The switch status does not change as the PTO
switches are cycled.
Proceed to Test Step 3.
3. Check the Status of the PTO Mode Disengage Switches
A. Use the electronic service tool in order to observe the
switch status while the PTO mode disengage switches are op-
erated OFF and ON.
Note: The PTO mode - Disengage switches usually function
by the operation of the brake, clutch, or the operator switch.
These switches should be operated separately for this test.
Switch status
changes from “EN-
GAGED” to
“DISENGAGED”
Result: The PTO mode - Disengage switch operates
correctly.
Use the electronic service tool to clear all logged diag-
nostic codes. Return the engine to service.
Result: The PTO mode - Disengage switch does not op-
erate correctly.
Proceed to Test Step 4.
(continued)
UENR4469-36 369
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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