Output Diagnostic Test Mode (DTM) (Function 03)

Output Diagnostic Test Mode (DTM), (Scan Tool Function 03)


NOTE:
- The output Diagnostic Test Mode (DTM) can only be carried out with the ignition switched on and the engine not running.
- The output DTM is interrupted if the engine is started or a rotary pulse is recognized.
- During the output DTM, the individual outputs are actuated until the scan tool program sequence is continued by pressing the -> button.
- Output signals are checked by listening for the sound of the component being actuated, or by feeling for mechanical evidence of actuation (clicking, vibration, etc.).
- Without letting the engine run briefly, switch the ignition off for approx. 20 seconds before repeating the output DTM.


Actuating sequence
1. Cyl. 1 fuel injector -N30-
2. Cyl. 2 fuel injector -N31-
3. Cyl. 3 fuel injector -N32-
4. Cyl. 4 fuel injector -N33-
5. Cyl. 5 fuel injector -N83-
6. Cyl. 6 fuel injector -N84-
7. Cyl. 7 fuel injector -N85-
8. Cyl. 8 fuel injector -N86-
9. Idle Air Control (IAC) valve -N71-
10. EVAP canister purge regulator valve -N80-
11. Intake manifold change-over valve -N156-


- Connect VAG1551 or VAG1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (ignition switched on). [1][2]Scan Tool Connecting and Initial Checks

Indicated on display


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -3- to select "Output Diagnostic Test Mode" (scan tool function 03).

Indicated on display


Rapid data transfer Q
03 - Output Diagnostic Test Mode


- Press -Q- button to confirm input.

Indicated on display


Output Diagnostic Test Mode ->
Injector Cyl. 1-N30







- Begin test by partially opening throttle (closed throttle position switch open).
Fuel injector will be heard and felt to click 5 times.
- All remaining fuel injectors are checked in sequence by pressing -> button on VAG1551 scan tool.

If one or more fuel injectors are not actuated:
- Check fuel injectors. Testing and Inspection

When all fuel injectors have been activated by the test sequence, pressing the -> button will advance the program sequence to the next component.

Indicated on display


Output Diagnostic Test Mode ->
Idle air control valve-N71


The Idle Air Control (IAC) valve will click until the test sequence is advanced by pressing the -> button.

If not:
- Check IAC valve. Refer to "Idle Air Control (IAC), Checking" Testing and Inspection
- Press -> button to advance program sequence.

Indicated on display


Output Diagnostic Test Mode ->
EVAP canister purge regulator valve-N80

The EVAP canister purge regulator valve will click until the test sequence is advanced by pressing -> the button.

If not:
- Check EVAP canister purge regulator valve. Testing and Inspection
- Press -> button to advance program sequence.

Indicated on display


Output Diagnostic Test Mode ->
Intake manifold change-over valve-N158


The Intake Manifold Tuning (IMT) valve will click until the test sequence is advanced by pressing the -> button.

If not:
- Check valve. Refer to "Intake Manifold Tuning (IMT) Valve/Electrical Testing" Testing and Inspection

Indicated on display


Rapid data transfer HELP
Select function XX


NOTE: To end the output Diagnostic Test Mode (DTM), press buttons -0- and -6- to select "End Output" (scan tool function 06), and press the -Q- button to confirm input.