(Table 203, contd)
Troubleshooting Test Steps
Values Results
4. Check the Suspect PTO Switch
A. Turn the keyswitch to the OFF position.
B. Remove the two wires from the suspect switch. Use a suit-
able jumper in order to join the two wires together.
C. Turn the keyswitch to the ON position.
D. Monitor the status screen on the electronic service tool
while the jumper wire is being disconnected and reconnected.
Switch status
changes when jump-
er is installed
Result: When the jumper wire is connected, the status
of the PTO mode switches is “CLOSED” . When the
jumper wire is disconnected, the status of the PTO mode
switches is “OPEN” - The fault is in the switch.
Repair: Replace the switch.
Use the electronic service tool in order to clear all logged
diagnostic codes and then verify that the repair has elim-
inated the problem.
Result: When the jumper wire is connected, the status
of the PTO mode switches is “OPEN” or when the jump-
er wire is disconnected the status of the PTO mode
switches is “CLOSED” .
Proceed to Test Step 5.
5. Measure the Resistance of the Cables at the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect switch.
C. Disconnect the P1 connector from the ECM.
D. Measure the resistance between P1:36 and the appropriate
pin on the P1 connector for the suspect switch. Refer to Illus-
tration 127 .
E. Repeat the procedure for each of the PTO mode switches.
Less than 2 Ohms
with switch ON.
Greater than 1 k
Ohm with switch off.
Result: The measured resistance is more than 2 Ohms
with the switch ON or the measured resistance is less
than 1 k Ohm with the switch OFF. - There is a fault with
the wires between the suspect switch and the P1
connector.
Repair: Repair the faulty wiring or replace the faulty
wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The measured resistance is less than two Ohms
with the switch ON. The measured resistance is more
than 1 k Ohm with the switch OFF.
Contact the Dealer Solutions Network (DSN).
i07044050
Relay - Test
(Aftertreatment Power Relay)
This procedure covers the following diagnostic
codes:
Table 204
Diagnostic Trouble Codes for the Aftertreatment Power Relay
J1939 Code PDL Code
Code Description
(code descriptions may vary)
Comments
5965-5 3838-5
Aftertreatment #1 DEF Control Module Relay
Control : Current Below Normal
The Electronic Control Module (ECM) detects a low current
condition in the aftertreatment power relay circuit.
5965-6 3838-6
Aftertreatment #1 DEF Control Module Relay
Control : Current Above Normal
The ECM detects a high current condition in the aftertreatment
power relay circuit.
Follow the troubleshooting procedure to identify the root cause of the fault.
370 UENR4469-36
Circuit Tests
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