Troubleshooting

Table 110
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 when the engine is running will be dis-
abled whilst this code is active.
If the engine is equipped with an air filter restriction
switch, the type of switch that is installed can be
either “Normally Open” or “Normally Closed” . The
parameter for the type of switch that is installed can
be set using the electronic service tool.
Use the electronic service tool to check which type of
switch is installed in the application before continuing
with this procedure.
Ensure that the parameter is set correctly for the type
of switch that is installed in the application. Refer to
the OEM for more information.
Table 111
Diagnostic Summary for a ““Normally Open”” Air Filter Restric-
tion Switch
Engine Condition
Switch State
Active Diagnostic
Code
Not running (key on) Open Normal condition
Running Open Normal Condition
(no air filter restric-
tion detected)
Not running Closed 107-2
Running Closed 107-15 or 107-16
Table 112
Diagnostic Summary for a ““Normally Closed”” Air Filter Re-
striction Switch
Engine Condition
Switch State
Active Diagnostic
Code
Not running (key on) Open 107-2
Running Open 107-15 or 107-16
Not running Closed Normal condition
Running Closed Normal Condition
(no air filter restric-
tion detected)
Note: An active 107–15 or 107–16 diagnostic code
indicates that the air inlet is restricted. Refer to
Troubleshooting, “Inlet Air Is Restricted”.
UENR0612-07 241
Circuit Tests
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