Exam 7: Understanding Obd Ii

Cold start emissions reduction is being discussed. Technician A says that a strategy to reduce them is to delay the PCM going into close loop mode. Technician B says that an applicable strategy is to retard ignition timing during engine warmup. Who is correct?

If there is an exhaust leak ahead of the rear HO₂S, or if the rear HO₂S is faulty, which of the following can result?

The OBD II data link connector (DLC) is being discussed. Technician A says terminal fourteen is always battery positive. Technician B says terminals four and five are always grounds. Who is correct?

On a 2001 model year or newer vehicle, the PCM is required to turn on the MIL and store a DTC if an EVAP system leak is identified that is larger than:

In addition to flashing the MIL, how do many OBD II PCMs react to a "Type A" (severe) cylinder misfire?

Which of the following statements is correct?

The newest OBD II monitor, introduced in 2008 and required under OBD II standards to be present on all U.S. vehicles by 2014, is the:

What requirement(s) is/are mandated by OBD II?

All of these organizations continue to work together to update and enhance the on-board diagnostic standards and regulations EXCEPT the:

The PCM will purposefully pulse the fuel injectors abnormally rich and lean when running which OBD II monitor?

The PCM will compare input values to each other when running which OBD II monitor?

On an OBD II vehicle, following the illumination of the MIL, the MIL will stay lit until the system or component passes the same test for _____ consecutive trips.

Technician A says that a monitor readiness status that is indicated as "Complete" means that the monitor has been identified by the PCM as a "PASS, NO PROBLEM FOUND": Technician B says that a monitor readiness status that is indicated as "Incomplete" could be a reason why a DTC has not been set for a failure and the appropriate drive cycle should be run.  Then DTCs should be rechecked. Who is correct?

Prior to erasing DTCs on an OBD II vehicle, a scan tool should be used to perform all of these tasks EXCEPT :

The newest global OBD II mode, mode $0A, was required on 100% of U.S. vehicles by the 2012 model year. Mode $0A is a scan tool request for:

Emissions that escape during refueling are being discussed. Technician A says an on-board refueling vapor recovery system may be used. Technician B says a fuel tank bladder may be used. Who is correct?

On an OBD II vehicle, how many times must the PCM see a fault present before it will illuminate the MIL (for most faults)?

An OBD II PCM will erase confirmed DTCs from memory if it does not see the problem occur again for:

An OBD II PCM is able to detect engine misfire by monitoring:

On GM OBD II vehicles, the PCM tests EGR operation by turning EGR on and off and monitoring which of the following sensors?