Troubleshooting

(Table 107, contd)
Troubleshooting Test Steps
Values Results
6. Create a Short at the ECM Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector from the ECM.
C. Fabricate a jumper wire and install the jumper wire be-
tween J2:6 and a suitable ground.
D. Turn the keyswitch to the ON position. Do not attempt to
start the engine. Wait at least 30 seconds for activation of the
diagnostic codes.
E. Use the electronic service tool to check for an active 100-2
diagnostic code.
Note: Diagnostic codes for all of the engine sensors will be
active with the P2 connector disconnected. Ignore all other
codes and only look for a 100-2 diagnostic code.
F. Turn the keyswitch to the OFF position.
G. Remove the jumper wire.
Diagnostic
Codes
Result: A 100-2 diagnostic code is not active with the jumper
installed.
The fault is in the wiring between the oil pressure switch and
the P2 ECM connector.
Check all wiring between the oil pressure switch and the ECM.
Refer to the appropriate Electrical Schematic.
Replace the faulty wiring. Use the electronic service tool to
clear all logged diagnostic codes and verify that the repair
eliminates the fault.
Result: A 100-2 diagnostic code is active with the jumper
installed.
Proceed to Test Step 7.
7. Check if a Replacement ECM Eliminates the Fault
A. Contact the Dealer Solution Network (DSN).
B. If the DSN recommends the use of a replacement ECM, in-
stall a replacement ECM. Refer to Troubleshooting, “Replac-
ing the ECM”.
C. Use the electronic service tool to recheck the system for
active diagnostic codes.
Diagnostic
codes
Result: There are no active diagnostic codes with the replace-
ment ECM.
Reconnect the suspect ECM. If the fault returns with the sus-
pect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
Result: The diagnostic code is still present with the replace-
ment ECM.
Contact the DSN.
i06233842
Switch Circuits - Test
(Throttle Switch)
Table 108
Diagnostic Trouble Codes for the Throttle Switch Circuit
J1939
Code
Description
Notes
(continued)
UENR0612-07 235
Circuit Tests
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