Test sequence

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Connect VAG 1551/1552 scan tool and with ignition switched on, select "Engine Electronics" address word 01. See VAG 1551 SCAN TOOL (ST), CONNECTING AND SELECTING "ENGINE ELECTRONICS" ADDRESS WORD 01 .

Indicated on display

Fig 1: VAG 1551/1552 Scan Tool Display For Output Diagnostic Test Mode (DTM) (Scan Tool Function 03) - 1 Of 4

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

Fig 2: VAG 1551/1552 Scan Tool Display For Output Diagnostic Test Mode (DTM) (Scan Tool Function 03) - 2 Of 4

To activate cylinder 1 fuel injector -N30-:

Press -Q- button to confirm input.

Indicated on display

Fig 3: VAG 1551/1552 Scan Tool Display For Output Diagnostic Test Mode (DTM) (Scan Tool Function 03) - 3 Of 4

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.
Turn off ignition.
Check fuel pump relay.
Checking fuel injector actuation (resistance and current supply) See checking fuel injectors.

To activate Evaporative Emission (EVAP) canister purge regulator valve -N80-:

Press --> button.

Indicated on display

Fig 4: VAG 1551/1552 Scan Tool Display For Output Diagnostic Test Mode (DTM) (Scan Tool Function 03) - 4 Of 4

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.
Fig 5: Disconnecting Pin Connector From Purge Regulator Valve

If LED flashes:

Replace EVAP canister purge regulator valve.

If LED does not flash:

Turn off ignition.
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 (Ω)

Fig 6: Connecting VAG 1598/18 Test Box To Engine Control Module (ECM) Wiring Harness
Check wiring between 2-pin connector terminal 2 and central electrical panel for open circuit according to wiring diagram.
Resistance: max. 1.5 ohms (Ω)
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 (Ω)
Additionally check wiring for short circuit to battery positive (B+).
Specification: INFINITE ohms (Ω)

If no malfunction in wiring is detected:

Reconnect EVAP canister purge regulator valve connector.
Replace ECM -J220-.
Press --> button.

Indicated on display

Fig 7: VAG 1551/1552 Scan Tool Display, Output Diagnostic Test Mode (DTM) - 1 Of 2

Disregard display.

Press --> key.

Indicated on display

Fig 8: VAG 1551/1552 Scan Tool Display, Output Diagnostic Test Mode (DTM) - 2 Of 2

Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
Turn off ignition.