Obd-2 System Readiness Monitor Status; Obd-2 Definition Of Terms - Unitec OBD II Mode D'emploi

20996_Bed.:Layout 1
Operating instructions
GB
When vehicle is running, the OBD II system continuously checks the components mentioned above
whereby important engine sensors, engine misfires and fuel requirement are monitored.
Non-continuous monitors -- Unlike with the continuous monitors many of the vehicle's emission
components and engine system components require to be operated under specific conditions before the
monitor is ready. These monitors are known as non-continuous monitors and are listed below:
1. EGR System (Exhaust Gas Recirculation System)
2. O2-Sensors
3. Catalyst
4. Evaporative System
5. Heated O2-Sensor
6. Secondary Air System
7. Heated Catalyst
8. Air conditioning system
2.5 OBD II readiness monitors
OBD II systems must display whether the vehicle's PCM monitor system has completed the tests on the
individual components or not. Components that have been tested are displayed as "Ready" or "Completed",
i.e. that they have been tested by the OBD II system. With the recording of the readiness status inspectors
should be able to determine whether the vehicle's OBD II system has tested all the components and /
or systems.
The Powertrain Control Module (PCM) sets a monitor to "Ready" or "Completed" after a corresponding
driving cycle has been carried out. The driving cycle through which a monitor is approved and the readiness
codes set to "Ready" differs for each individual monitor. If a monitor is set to "Ready" or "Completed" it
remains on this status. A range of factors, including the deletion of diagnostic trouble codes (DTCs) with a
scan tool or a battery not connected can lead to the readiness monitors being set to "Not ready". As the
three continuous monitors are constantly evaluating they are displayed as "Ready" all the time. If the test
of a specific supported non-continuous monitor has not yet been completed the monitor status is displayed
as "Not ready" or "Not completed".
So that the OBD monitor system goes into readiness mode the vehicle should be driven under various
normal operating conditions. These operating conditions can include motorway driving and stop-and-go
town driving. You will find special information on setting up the readiness mode of your vehicle's OBD
monitor system in the user handbook of your vehicle or at your specialist garage.
2.6 OBD II terms
Powertrain Control Module (PCM) -- OBD II term for the on-board computer that controls the engine
and the powertrain.
Malfunction Indicator Light (MIL) -- ("Service Engine Soon", "Check Engine") stands for the light in the
display and instrument panel. This warns the driver and / or the repair technician that a problem has arisen
with one or several vehicle systems that can lead to the national standards for emission values being ex-
ceeded. If the MIL is illuminated constantly it displays that a problem has been determined and the vehicle
should be checked in a garage as soon as possible. Under certain circumstances the light on the dashboard
flashes or lights up. This shows that a serious problem has arisen and this illumination is intended to prevent
the driver from using the vehicle. The MIL cannot be switched off via the vehicle's on-board diagnostic
system until the necessary repairs have been completed or the situation rectified.
14.04.2010 15:33 Uhr Seite 18
18
O
f
3
3
1
2
3
4
3
2
3
4
5
6