Output Diagnostic Test Mode (DTM)
Output Diagnostic Test Mode (DTM) (Function 03)
NOTE:
- The output Diagnostic Test Mode (DTM) can be activated only with ignition switched on and the engine not running.
- The output DTM is interrupted if the engine is started, or if a rotary pulse from the ignition system is recognized.
- When operating in output DTM, individual output signals are actuated until program sequence is advanced by pressing the -> button.
- Output signals are checked by listening for the sound of the component being actuated, or feeling for mechanical evidence of actuation, such as clicking, vibration, etc.
- Without letting the engine run, briefly switch the ignition off for approx. 20 seconds before repeating the output checks.
- During the output DTM sequence, the electric fuel pump will run.
- The output DTM will be interrupted after 10 minutes.
In the output Diagnostic Test Mode (DTM), the following components are actuated in sequence:
1. Cylinder 1 fuel injector -N30-
2. Cylinder 2 fuel injector -N31-
3. Cylinder 3 fuel injector -N32-
4. Cylinder 4 fuel injector -N33-
5. EVAP canister purge regulator valve -N80-
6. Wastegate bypass regulator valve -N75-
Required special tools and testing equipment
- Connect VAG 1551 Scan Tool (ST) with adapter VAG 1551/3
Requirements
- Fuse for Engine Control Module (ECM) OK
- Closed Throttle Position (CTP) switch -F60- Ok
- Fuel pump relay OK
Test sequence
- Connect VAG 1551/VAG 1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (ignition switched on). Connecting VAG 1551/1552 Scan Tool
Indicated on display
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
Fuel injectors:
- Press -Q- button to confirm input.
Indicated on display
Output Diagnostic Test Mode ->
Cylinder 1 fuel injector-N30
NOTE: The fuel pump relay must be activated, the fuel pump must run, and you must clearly hear the flow of fuel in the fuel pressure regulator. If the fuel pump does not run, check fuel pump relay and connections. Testing and Inspection
- Operate throttle valve at throttle body.
As soon as the Closed Throttle Position (CTP) switch opens, cylinder 1 fuel injector must be actuated (click) 5 times.
To check remaining fuel injectors:
- Press -> button and open the throttle valve again.
As soon as the Closed Throttle Position (CTP) switch opens, the applicable fuel injector must be actuated (click) 5 times.
- Repeat for each fuel injector.
To skip individual tests:
- Press -> button to advance program sequence.
If one or more of the fuel injectors is not actuated:
- Check fuel injectors. Refer to "Fuel injector Actuation, Checking" Testing and Inspection
EVAP canister purge regulator valve -N80-
- Press -> button to advance program sequence.
Indicated on display
Output Diagnostic Test Mode ->
EVAP canister purge regulator valve-N80
The valve will click until pressing the -> button to advance the program sequence.
If the valve is not actuated (does not click):
- Check EVAP canister purge regulator valve. Testing and Inspection
Wastegate bypass regulator valve -N75-:
- Press -> button to advance program sequence.
Indicated on display
Output Diagnostic Test Mode ->
Wastegate bypass regulator valve-N75
The valve will click until pressing the -> button to advance the program sequence.
If the valve is not actuated (does not click):
- Check wastegate bypass regulator valve - N75-. Testing and Inspection
- Press -> button to advance program sequence.
Indicated on display
Rapid data transfer HELP
Select function XX
NOTE: Before selecting "Output Diagnostic Test Mode" function 03, switch off the ignition for approx. 20 seconds.