Output Diagnostic Test Mode (Function 03)
OUTPUT DIAGNOSTIC TEST MODE (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 (EVAP) canister purge regulator valve -N80-
6 - Secondary Air Injection (AIR) solenoid valve -N112-
7 - Secondary Air Injection (AIR) pump relay -J299-
8 - Evaporative Emission (EVAP) 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. VAG 1551 Connecting and Selecting 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.
- Checking fuel injector actuation (resistance and current supply), refr to "Fuel Injectors, Checking". Testing and Inspection
To activate Evaporative Emission (EVAP) canister purge regulator valve -N80-:
- Press -> button.
Indicated on display
Output Diagnostic Test Mode(DTM) ->
EVAP canister purge regulator valve -N80-
- The EVAP canister purge regulator valve must click until the next component is activated by pressing the -> button.
- Disconnect hose off purge regulator valve (from EVAP canister).
- 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: Infinity Ohms
- Additionally check wiring for short circuit to positive (B+).
Specification: Infinity Ohms
If no malfunction in wiring is detected:
- Reconnect EVAP canister purge regulator valve connector.
- Replace ECM -J220-.
- Press -> button.
To activate secondary air injection solenoid valve -N112-:
Indicated on display:
Output Diagnostic Test Mode(DTM) ->
Secondary AIR solenoid valve - N112
- Press -> key.
- Secondary air injection solenoid valve must remain activated until the next component is activated by pressing the -> key.
If secondary air injection solenoid valve does not switch:
- Disconnect 2-pin connector from secondary air injection solenoid valve -N112- -2-.
- Connect VAG 1527B voltage tester to 2-pin connector using test leads from VW 1594.
- LED must light up
If LED lights up (voltage supply OK):
- Replace secondary air injection solenoid valve -N112-.
If LED does not light up:
- Switch ignition off.
- Connect VAG 1598/18 test box to ECM wiring harness.
- Check wiring between test box and 2-pin connector terminal 2 for open circuit according to wiring diagram.
Terminal 2 and test box socket 50
Resistance: Max. 1.5 Ohms
- Check wire between 2-pin connector terminal 1 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 1 and test box socket 50
Specification:Infinity Ohms
- Additionally, check wiring for short circuit to battery positive (B+).
Specification:Infinity Ohms
If no malfunction in wiring is detected:
- Reconnect secondary air injection solenoid valve.
- Replace ECM -J220-.
To activate secondary air injection pump relay -J299-:
- Press -> key
Indicated on display:
Output Diagnostic Test Mode(DTM) ->
Secondary air injection pump relay-J299
- The secondary air injection pump relay -J299- must activate the secondary air injection pump motor -V101-.
If the secondary air injection pump motor does not run:
- Disconnect 2-pin connector from secondary air injection pump motor-V101-.
- Connect VAG 1527B voltage tester to 2-pin connector using test leads from VW 1594.
- LED must light up.
IF LED lights up (voltage supply OK):
- Replace secondary air injection pump motor -V101-.
If LED does not light up:
- Check fuse -3- on secondary air injection pump relay.
- Connect VAG 1598/18 test box to ECM wiring harness.
- Check wiring between test box socket 49 and secondary air injection pump relay -J299- for open circuit according to wiring diagram.
Resistance: max. 1.5 Ohms
- Check secondary air injection pump relay -J299-
See Electrical Wiring Diagrams.
- Check wiring to secondary air injection pump motor -V101- according to wiring diagram.
- Press -> key.
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.
NOTE: The secondary air injection pump continues to run until 06 is entered for the "End Output" function.
- Switch ignition off.