If equipped , remove the pipe plug from the pressure tap located in the turbocharger exhaust outlet tubing or the
inlet of the aftertreatment system .
Install the service tool pressure gauge, Part Number ST1273, or equivalent, into the pressure tap location.
Install the service tool pressure/vacuum module, Part Number 3164491 , or equivalent, into the pressure tap location.
If the exhaust outlet tubing or the inlet of the aftertreatment system is not equipped with a pressure tap
location, remove the first exhaust temperature sensor located in the aftertreatment system . Refer to Procedure
019-449 in Section 19.
Install an adapter fitting in the temperature sensor port, Part Number 4918576, or equivalent, in the port. This will
adapt the temperature sensor port to 1/8 inch NPT pipe threads.
Install the service tool pressure gauge, Part Number ST1273, orequivalent, into the pressure tap location.
NOTE: Install at least 12 inches of metal tubing between the exhaust pipe pressure tap and the pressure gauge to
prevent exhaust from damaging the gauge and giving an inaccurate reading.
Operate the engine at rated speed and load and record the exhaust restriction.
Use a chassis dynamometer for engine testing. Refer to Procedure 014-012 in Section 14.
Compare exhaust restriction measurement to specification for maximum exhaust restriction for a dirty aftertreatment diesel particulate filter. For specifications reference 018-020 in Section V. If the exhaust restriction
exceeds the specification inspect:
• The exhaust piping for damage, refer to the OEM service manual.
• Check for any fault codes related to the Cummins® particulate filter indicating a possible damaged of plugged aftertreatment system.
If equipped with an exhaust pressure tap, remove the test equipment and install the pipe plug. Coat the threads of
the plug with high-temperature anti-seize compound prior to installation.
If an aftertreatment exhaust temperature sensor port was used, remove the test equipment and install the exhaust
temperature sensor. Refer to Procedure 019-449 in Section 19.
NOTE: Clear any inactive fault codes with INSITETM electronic service tool, once the testing is completed.
