Unitec 20996, Instruction Manual

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DTC -- Diagnostic trouble codes (DTC), that show which area of emission control is not working.
OBD II driving cycle -- a special vehicle operating mode with which a state is to be achieved that is
required to move all readiness monitors relevant to the vehicle to the “Ready” state. A specific driving cycle
must be carried out after the DTCs have been erased from the PCM memory or after the battery has been
disconnected. Going through a complete driving cycle “switches” the readiness monitors “on”, so that
future malfunctions can be determined. Driving cycles vary according to vehicle and monitor which must be
reset. You can find vehicle-specific driving cycles in the user handbook of your vehicle.
3. PRODUCT INFORMATION
3.1 Description of device
1. LCD-DISPLAY -- shows the test results.
It is a two-line, back-lit display with
8 characters in each line.
2. OK/ENTER BUTTON -- with this button a selection
(or action) from a menu list is confirmed,
or it takes you back to the main menu.
3. SCROLL BUTTON -- with this button you can
scroll through the menu items or erase
an operation.
4. OBD II CONNECTOR -- connects the code
scanner to the vehicle’s data link connector (DLC).
3.2 Product specifications
1. Display: LCD, 2 lines, 8 characters, back-lit
2. Operating temperature 0 to 50°C
3. Storage temperature: -20 to +70 °C
4. Power supply via removable OBD II heavy-duty cable
5. Dimensions:
Length
126 mm
Width 78 mm
Height 28 mm
6. Weight: 200 g
GB
Operating instructions
GB
Operating instructions
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.
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20996_Bed.kompl.:Layout 1 02.08.2010 14:05 Uhr Seite 18