(Table 86, contd)
Troubleshooting Test Steps
Values
Results
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.
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 wire to the sus-
pect switch and a suitable ground.
10 V to 14 V
Result:
The measured voltage is within the ex-
pected range.
Proceed to Test Step 6.
Result:
The measured voltage is not within the
expected range.
Proceed to Test Step 5.
5. Check the Wiring Between the Suspect switch and the ECM
Main Power Relay
A. Turn the keyswitch to the OFF position.
B. Disconnect the battery supply wire from the suspect switch.
C. Disconnect the ECM main relay.
D. Use a multimeter to measure the resistance between the dis-
connected wire and terminal 87 on the harness connector for the
ECM main relay.
Less than 5 Ohms
Result:
The measured resistance is greater than
5 Ohms.
The fault is in the wiring between the suspect
switch and the ECM main relay
Check all wiring between the suspect switch and
the ECM main relay. Refer to the Electrical Sche-
matic for the application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged
diagnostic codes and verify that the repair elimi-
nates the fault.
Result:
The measured resistance is less than 5
Ohms.
Refer to Troubleshooting, “Relay - Test (ECM
Main Relay)” in order to test the circuit for the
ECM main relay.
(continued)
172
UENR0612
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