System Level, Diagnostics

The Tech 2 communicates at system level with the selected control module in order to obtain the desired information. The system menu may contain the following headings. The majority of systems will contain only some of the following headings:
1. "F0: Diagnostic Trouble Codes"
2. "F1: Read Values/ Activate"
3. "F2: Adjustment"
4. "F3: Snapshot"
5. "F4: System Information"

Here follows a short description of the menu headings, accompanied by a more detailed description which also contains some examples.

Diagnostic Trouble Codes
A list of diagnostic trouble codes that have been generated in one of the car's control modules, with descriptions and code status, can be obtained through the Tech 2. The diagnostic trouble codes are listed by priority, depending on their status.

Read Values/Activate
Different functions in the system can be activated by selecting them and readings of their values can be obtained.

Parameters can be shown as a graph ("Line Graph") which can be selected by means of a display key.

The Tech 2 supports the display of control module data which is updated in step with changes in the vehicle's electronic systems. Important parameters can be selected at any time and grouped at the top of the list for easier observation.

Certain control module functions can also be tested here. One of the most common tests is the idling speed test in which engine rpm can be increased or decreased. Some control modules can also check the injectors. They do this by disconnecting individual injectors so that weak cylinders can be detected. There are also tests with which the function of actuators in electronic systems can be checked.

Adjustment
This function is used to program the control module's memory with fresh data.
Example: Country code for anti-theft alarm.

Snapshots
The "Snapshot" function enables values from control modules to be recorded for subsequent playback and analysis.

"Snapshot" is particularly useful when carrying out fault diagnosis where intermittent faults are concerned.

Recorded values can be shown either in a regular read value list or as a line graph.

There are three different ways of recording "Snapshots", depending on how it is desired to use the available recording time.

Recording continues until the memory is full or until recording is interrupted by pressing "EXIT". Two snapshots at a time can be recorded in the Tech 2's memory. If additional "Snapshots" are recorded, the earliest recording will be deleted from the Tech 2's memory.

Available recording time varies between different systems and diminishes at the same rate as the number of recorded read values increases.

All parameters are saved and five parameters at a time can be selected at any moment for observation as a group.

Three parameters at a time can be selected additionally for display in the form of a graph using the "Plot" function.

System Information
This function shows system data, such as the part number and version of the software and hardware. This information is system dependent.