Method for verifying the functionality of the components of a diesel particulate filter system

A method to perform diagnostics on an electronically controlled diesel engine equipped with an electronic control unit (ECU) having memory and tables resident therein;

• said engine further equipped with an ignition and at least one sensor adapted to transmit data signals from a diesel particulate filter system having a catalyst with, an inlet and an outlet;
• said method comprising:
• determining pressure from at least one of said diesel particulate inlet and said outlet at when said engine is at least at one of low engine speed and low engine torque;
• determining pressure from at least one of said diesel particulate inlet and said outlet when said engine is at least at one of high engine speed and high engine torque;
• and
• comparing at least one of said diesel particulate inlet and outlet pressure between low engine speed and low engine torque with at least one of said diesel particulate inlet and outlet pressure at high engine speed ad high engine torque with at lease one of diesel particulate inlet and outlet pressure at high engine speed and at least one of calibratable minimum delta of diesel particulate inlet and outlet pressure in memory in said ECU with a calibratable minimum period of time in memory in said ECU to determine whether said sensor is accurate.