Output Diagnostic Test Mode (DTM) (Scan Tool Function 03)
Output Diagnostic Test Mode (DTM) (scan tool function 03)
The output Diagnostic Test Mode (DTM) actuates the following components in the stated 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 Evaporative Emission Canister Purge Regulator Valve -N80-.
6 Evaporative Emission Canister Purge Solenoid Valve -N115-.
Special Tools, Testers And Auxiliary Items
- VAG 1551/1552 scan tool with VAG 1551/3 adapter cable
- VAG 1598/18 test box
- Connector test kit VW 1594
- VAG 1527B voltage tester
Test Conditions
- Throttle Position (TP) sensor -G69- OK
- Fuse 18 OK
Test Sequence
- Connect VAG 1551/1552 scan tool and with ignition switched ON, select "Engine Electronics" address word 01.
Indicated on display
Rapid data transfer HELP
Select function XX
- Operate VAG 1551/1552 scan tool taking into account the information on the display.
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
To activate cylinder 1 fuel injector -N30-:
- Press -Q- button to confirm input.
Indicated on display
Output Diagnostic Test Mode (DTM) -->
Cylinder 1 Fuel Injector N30
- Open throttle fully and close again.
- The cylinder 1 fuel injector must click.
NOTE: All fuel injectors click extremely quietly!
To activate fuel injectors for cylinders 2-4, in each case:
- Open throttle fully again and close.
Skipping Individual Tests:
- Press -> button.
If one or more fuel injectors do not click:
- Continue output Diagnostic Test Mode (DTM) to the end.
- Switch ignition off.
- Check fuel pump relay.
- Check fuel injector actuation (resistance and current supply).
To activate Evaporative Emission canister purge regulator valve -N80-:
- Press -> button.
Indicated on display
Output Diagnostic Test Mode (DTM) -->
EVAP Cannister Purge Regulator Valve-N80-
- The EVAP canister purge regulator valve must click until the next component is activated by pressing the -> button.
- Disconnect hose from EVAP canister purge regulator valve.
- Connect auxiliary hose.
- During output DTM blow into auxiliary hose (in direction of throttle housing).
- Valve must open and close
If the purge regulator valve does not open and close:
- Disconnect 2-pin connector from valve and connect VAG 1527B voltage tester with test leads from VW 1594.
The LED must flash.
If LED flashes:
- Replace EVAP canister purge regulator valve.
If LED does not flash:
- Switch ignition off.
- Connect VAG 1598/18 test box to Engine Control Module (ECM) wiring harness (arrow).
- Check wiring between test box and 2-pin connector for open circuit according to wiring diagram.
Terminal 1 and test box socket 31
Resistance: max. 1.5 ohms
- Check wiring between 2-pin connector terminal 2 and central electrical panel for open circuit according to wiring diagram.
Resistance: max. 1.5 ohms
- Check wiring between ECM connector and 2-pin connector terminal 1 for short circuit to terminal 2 and to vehicle Ground (GND), according to wiring diagram.
Terminal 2 and test box socket 31
Specification: Infinite ohms
- Additionally check wiring for short circuit to battery positive (B+).
Specification: Infinite ohms
If no malfunction in wiring is detected:
- Reconnect EVAP canister purge regulator valve connector.
- Replace ECM -J220-.
- Press -> button.
Indicated On Display
Output Diagnostic Test Mode (DTM) ->
EVAP Canister Purge Solenoid Valve-N115
Disregard Display.
- Press -> key.
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Switch ignition off.