(Table 231, contd)
Troubleshooting Test Steps
Values Results
4. Check the Harness for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 ECM connector and the connector for
the throttle switch.
C. Measure the resistance between each of the throttle switch
inputs and the appropriate terminal on the P1 connector.
D. Measure the resistance between the return terminal on the
throttle switch and the “Switch Return” terminal on the P1
connector.
Less than two Ohms Result: At least one of the resistance measurements is
greater than two Ohms. The fault is in the wiring be-
tween the throttle switch and the P1 connector.
Repair: Repair the faulty wiring or replace the faulty
wiring.
Use the electronic service tool in order to clear all logged
diagnostic codes and then verify that the repair has elim-
inated the fault.
Result: All resistance measurements are less than two
Ohms.
Proceed to Test Step 5.
5. Check the Harness for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 ECM connector and the connector for
the throttle switch.
C. Measure the resistance between the suspect input terminal
and all other terminals on the P1 connector.
D. Measure the resistance between the “Switch Return” termi-
nal and all other terminals on the P1 connector.
Greater than 100
Ohms
Result: At least one of the resistance measurements is
less than 100 Ohms. There is a short in the harness be-
tween the throttle switch connector 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: All resistance measurements are greater than
100 Ohms.
Contact the Dealer Solutions Network (DSN).
i07746265
Switch Circuits - Test
(Air Filter Restriction Switch)
Use the following procedure to troubleshoot a
problem with a two-wire air filter restriction switch
circuit. The procedure that follows also covers the
diagnostic codes that are listed in Table 232 .
Table 232
Diagnostic Trouble Codes for the Air Filter Restriction Switch
J1939
Code
PDL Code
Code Description
(Code descriptions may vary)
Comments
(continued)
UENR4469-36 441
Circuit Tests
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