Troubleshooting

(Table 80, contd)
Troubleshooting Test Steps
Values Results
6. Check the Wiring for High Resistance
A. Turn the keyswitch to the OFF position.
B. Disconnect the mode selection switch. Disconnect the P1
connector.
C. Use a suitable multimeter to measure the resistance between
the following points:
· P1:55 to the signal terminal at the switch connector
· P1:77 to the ground terminal at the switch connector
Less than 5
Ohms
Result: At least one of the resistance measurements is
greater than 5 Ohms.
The fault is in the wiring between the switch connector
and the P1 connector.
Repair: 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: Both resistance measurements are less than 5
Ohms.
Proceed to Test Step 7.
7. Check the Wiring for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 connector from the ECM.
C. Disconnect the mode selection switch.
D. Use a suitable multimeter to measure the resistance between
the following points:
· P1:55 and all other terminals on the P1 connector
· P1:77 and all terminals on the P1 connector
Greater than 1 k
Ohm
Result: At least one of the resistance measurements is
less than 1 k Ohm.
There is a short in the wiring between the mode selection
switch and the P1 connector.
Repair: 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: All resistance measurements are greater than 1
k Ohm.
Contact the Dealer Solution Network (DSN).
i06015840
Motorized Valve - Test
This procedure covers the following codes:
Table 81
Diagnostic Trouble Codes for the Motorized Valves
J1939
Code
Description
Notes
2791-5 Engine Exhaust Gas Recirculation
(EGR) Valve Control : Current Be-
low Normal
The Electronic Control Module (ECM) detects the following conditions:
A low current condition in the output for the NOx Reduction System (NRS) valve for at least
0.3 seconds.
The battery voltage is at least 10 VDC.
The engine will be derated. The ECM will log the diagnostic code.
(continued)
UENR0612-07 163
Circuit Tests
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