Chat with AIExam 9: Strategies of On-Board Diagnostic Continuous Monitors
The PCM closely monitors the fuel delivery system through the use of the fuel monitor.
(39) 
VerifiedTrue
How can a diagnostic scan tool be used to aid in performing a drive cycle, and what is a typical pattern for an OBD II drive cycle?
(34) VerifiedDrive cycles follow a general pattern, but the specific drive cycle for each monitor type and manufacturer requires slightly different driving conditions. A drive cycle includes a cold engine key-on startup followed by a warm-up period at idle. The next phase is a moderate acceleration, cruise, followed by deceleration. A second idle period for one minute with another heavier acceleration is followed by a steady-state cruise and a final deceleration. Using a scan tool, you can access the Readiness Status menu to determine which monitors have run and which have not. Driving the vehicle while displaying the Readiness Status allows the driver to view the information as each monitor is run to completion.
What is long-term fuel trim (LTFT)?
(39) VerifiedThe long-term fuel trim (LTFT) is a software program that applies an adaptive fuel strategy by learning the short-term fuel trim (STFT) correction values and stores this information in comparative tables in the KAM.
What type of tests does the comprehensive component monitor perform, and when does the it run?
(27) The comprehensive component monitor will use one-trip logic when determining when to set a DTC and illuminate the MIL.
(30) Technician A says that the engine misfire monitor is a non-continuous monitor. Technician B says that the engine misfire monitor is a continuous monitor. Who is correct?
(39) Technician A says the continuous component monitor performs operating range testing of emission control sensors. Technician B says the continuous component monitor performs rationality testing of emission control sensors. Who is correct?
(32) The continuous monitors are the catalyst efficiency, misfire, and continuous component monitors.
(36) A Type A misfire is a misfire that will cause emission levels to exceed 1.5 times the FTP and will set a code and turn on the MIL on the second consecutive trip where it is detected.
(34) A misfire occurs when the air/fuel mixture in the combustion chamber ignites and complete combustion occurs.
(43) Technician A says the comprehensive component monitor will use three-trip logic when determining when to set a DTC and illuminate the MIL. Technician B says an OBD II system requires a drive cycle to occur that meets specific enable criteria before the monitors will run to completion. Who is correct?
(41) What type of misfire will cause the misfire monitor to illuminate the MIL steady but not to flash?
(42) A Type B misfire is one that could cause immediate damage to the catalytic converter, and the misfire monitor will cause the MIL to flash.
(30) What type of misfire could cause immediate damage to the catalytic converter and will cause the MIL to flash?
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