Test sequence

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen GTI, 1998 Volkswagen Jetta, 1998 Volkswagen GTI, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Connect the 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 - Rapid Data Transfer

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 - Rapid Data Transfer Q

To activate cylinder 1 fuel injector -N30-:

Press -Q- button to confirm input.

Indicated on display

Fig 3: VAG 1551/1552 Scan Tool Display - Output Diagnostic Test Mode (Cylinder 1 Fuel Injector)

Open throttle valve 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 -6, in each case:

Open throttle valve fully again and close.

To skip individual tests:

press --> button.

If one or more fuel injectors do not click:

Continue Output DTM to the end.
Switch ignition off.
Check fuel injector actuation (resistance and current supply). See FUEL INJECTORS, CHECKING .

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

press --> button.

Indicated on display

Fig 4: VAG 1551/1552 Scan Tool Display - Diagnostic Test Mode (EVAP Canister Purge Regulator Valve)

The EVAP canister purge regulator valve must click until the next component is activated by pressing the --> button.

Pull 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 at valve and connect VAG 1527B voltage tester with test leads from VW 1594 to disconnected connector.
- 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 ECM wiring harness (arrow).

Fig 5: Connecting VAG 1598/18 Test Box To ECM Wiring Harness

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 (ohm)
Check wiring between 2-pin connector terminal 2 and central electrical system for open circuit according to wiring diagram.
Resistance: Max. 1.5 ohms (ohm)
Check wiring between ECM connector and 2-pin connector terminal 1 for short circuit to wire terminal 2 and to vehicle Ground (GND), according to wiring diagram.
Terminal 2 and test box socket 31

Specification: "infinity" ohms (ohm)
Additionally, check wiring for short circuit to battery positive (B+).
Specification: "infinity" ohms (ohm)

If no malfunction in wiring is detected:

Reconnect harness connector to EVAP canister purge regulator valve.
Replace Engine Control Module (ECM) -J220-.

To activate Secondary Air Injection (AIR) solenoid valve - N112-:

press --> button.

Indicated on display

Fig 6: VAG 1551/1552 Scan Tool Display - Output Diagnostic Test Mode (AIR Solenoid Valve)

The Secondary air injection solenoid valve must run until the next component is activated by pressing the --> button.

If the relay does not click:

Disconnect 2-pin connector at Secondary Air Injection (AIR) solenoid valve -N112-.
Connect VAG 1527B voltage tester using test leads from VW 1594 to disconnected connector.
- LED must light up

If LED lights up (voltage supply OK):

Replace Secondary Air Injection (AIR) solenoid valve - N112-.

If LED does not light up:

Check wiring to Secondary Air Injection (AIR) solenoid valve -N112- according to wiring diagram.
Check Secondary Air Injection (AIR) pump relay -J299-:

See appropriate Electrical Component Locator article.

To activate Secondary Air Injection (AIR) pump relay - J299-:

press --> button.

Indicated on display

Fig 7: VAG 1551/1552 Scan Tool Display - Diagnostic Test Mode (AIR Pump Relay)

The Secondary Air Injection (AIR) pump relay -J299- activates the secondary air pump motor, and this must run at intervals until the next component is activated by pressing the --> button.

If the secondary air pump motor does not run:

Disconnect 2-pin connector at Secondary Air Injection (AIR) pump motor -V101-.
Connect VAG 1527B voltage tester using test leads from VW 1594 to disconnected connector.
- LED must light up

If LED lights up (voltage supply OK):

Replace Secondary Air Injection (AIR) pump motor -V101-.

If LED does not light up:

Check Secondary Air Injection (AIR) pump relay -J299-:

See appropriate Electrical Component Locator article

Check wiring to Secondary Air Injection (AIR) pump motor -V101- according to wiring diagram.
press --> button.

Indicated on display

Fig 8: VAG 1551/1552 Scan Tool Display - Output Diagnostic Test Mode

Disregard display.

press --> button.

Indicated on display

Fig 9: VAG 1551/1552 Scan Tool Display - Rapid Data Transfer

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