(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 between
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 ac-
tive with the P2 connector disconnected. Ignore all other co-
des 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 elimi-
nates 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 ac-
tive 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.
i05946079
Switch Circuits - Test
(Air
Filter
Restriction
Switch)
Use this procedure to diagnose electronic faults in the
air filter restriction switch circuit.
This procedure covers the following diagnostic code:
Table 108
Diagnostic Trouble Codes for the Air Filter Restriction Switch
J1939 Code
Description
Notes
107-2
Engine Air Filter 1 Differential Pressure : Erratic, Inter-
mittent, or Incorrect
This code indicates a fault in the circuit for the air filter restriction switch.
The Electronic Control Module (ECM) detects the following conditions:
The signal from the air filter restriction switch indicates a restriction.
The engine is not running.
The ECM has been powered for at least 6 seconds.
The warning lamp will come on.
Monitoring of air filter restriction while the engine is running will be dis-
abled while this code is active.
UENR0612
225
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