Install a vacuum gauge or water manometer in the intake air piping.
NOTE: The gauge adapter must be installed at a 90-degree angle to the airflow in a straight section of pipe, 127 mm [5 in] before the turbocharger compressor inlet.
If the malfunction resulted in coolant, oil, excessive fuel, or excessive black smoke entering the exhaust system, the aftertreatment system must be inspected. Refer to Procedure 014-013 in Section 14.