On Board Diagnostic, (OBD), Initiating

Output Diagnostic Test Mode (DTM)


NOTE:
- Component location of activated component.
- The Output Diagnostic Test Mode (DTM) can be carried out more than once if necessary.
- If components marked with an * malfunction, DTCs for these components can be stored in DTC memory.
- Checking the "Idle Air Control" (IAC) regulation function. Refer to "Idle Air Control (IAC) Regulation, Initiating Output Diagnostic Test Mode (DTM)" under "Powertrain Management" Testing and Inspection
- During output DTM, the vehicle must not be moved and the engine speed must be lower than 3000 RPM.
- During output DTM, the air conditioning control functions are switched off Depending on A/C Control Head -E87- version, all segments, control lights in buttons as well as the button illumination of -E87- are displayed or dark.
- The output DTM sequence for A/C Control Heads -E87- are different for vehicles up to model year 2001 and from model year 2002.
- The climate control conversion on the Audi allroad does not occur with the 2001 to 2002 model year change, but instead changes in model year 2002.


Initiating output DTM
- Star engine (vehicles up to model year 2001).
- Switch ignition on or start engine (vehicles from model year 2002).


NOTE:
- The engine should not be running, if the actuation of "A/C Compressor Regulator Valve -N280-" or "A/C clutch -N25-" is being checked on vehicles from model year 2002. With engine running the A/C Control Head -E87- does not actuate these actuators, but starts the output DTM with Fresh Air Blower -V2-.
- The engine must be running, if the activation of Coolant FC (Fan Control) Control Module -J293- on vehicles from model year 2002 is to be checked. Depending on engine type, the A/C Control Head -E87- sends the request to switch on the coolant fan directly to the Engine Control Module (ECM), the Coolant FC (Fan Control) Control Module - J293 or to one of the respective coolant fan relays. Depending on the version e.g. the Engine Control Module switches the coolant fan on, but only with the engine running.


- Press AUTO button to switch compressor on.
- Open instrument panel vents.
- Set air distribution to instrument panel vents.
- Connect VAG1551 Scan Tool (ST), Press buttons -0- and -8- to insert "AC/Heating Electronics" address word 08 and advance program until "Select function XX" appears on display, Scan Tool Connecting and Initial Checks
- Switch printer on via the PRINT button (indicator lamp in button lights up).
- Check DTC memory.

Indicated on display (function selection):


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -3- to select "output Diagnostic Test Mode" function 03.

Indicated on display:


Rapid data transfer Q
03 - Output Diagnostic Test Mode (DTM)


- Press -Q- button to confirm input.

Indicated on display:


Output Diagnostic Test Mode (DTM)
A/C clutch -N25-


- The -> button is used to advance through the program sequence.


NOTE:
- Pressing the C-button can terminate output DTM.
- When output DTM is completed, check DTC memory.
- If at the beginning of output DTM the message "Function is unknown or cannot be carded out at the moment" appears on the display (e.g. if the engine is not running), press the advance button and select function 03 (output Diagnostic Test Mode) again. The control element "A/C clutch -N25-" will longer be activated during this test).
- If the message "Function unknown or cannot be carded out at the moment" appears on the display, Read measuring value block (display group 001).


Indicated on display:


Function is unknown or ->
cannot he performed at the moment!


- If this display appears, DTM is concluded.
- Press -> button.