Work sequence

Connect VAG 1551 Scan Tool (VAG 1552). Switch ignition on and select engine control module with "Address word" 01. (Connecting scan tool and selecting engine control module VAG 1551 Scan Tool (ST), connecting and selecting engine control module ).

Indicated on display:

Fig 1: Scan Tool Display - Rapid Data Transfer

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Operate scan tool taking into account information on display.
Press keys 0 and 3 for the function "Output Diagnostic Test Mode (DTM)".

Indicated on display:

Fig 2: Scan Tool Display - 03 Output Diagnostic Test Mode

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Activate fuel injectors -N30- through -N33-:

Confirm input with Q key.

Indicated on display:

Fig 3: Scan Tool Display - Output Diagnostic Test Mode/Injector Cylinder 1

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NOTE: The fuel pump must run and the flow noise must be distinctly audible at the fuel pressure regulator. If the fuel pump does not run, check activation.

See FUEL PUMP, CHECKING .

Open throttle valve. As soon as idling switch opens, number 1 Cyl. injector will click 5 times.
Press --> key each time to advance to next injector (advancing is also possible without testing each individual injector).

All injectors can be checked one after another in this way.

If one of the injectors is not activated (does not click):

Checking injectors. See FUEL INJECTORS, CHECKING .

Activating EVAP Canister Purge Regulator

Valve -N80-:

Press --> key.

Indicated on display:

Fig 4: Scan Tool Display - Output Diagnostic Test Mode/EVAP Canister Purge Regulator Valve

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The EVAP canister purge regulator valve must click until the next final control is activated by pressing --> key.

If the valve does not click:

Pull connector -1- off valve -2- and connect diode test lamp VAG 1527 with auxiliary cables from VAG 1594 to disconnected connector.

Fig 5: Connecting Diode Test Lamp VAG 1527 With Auxiliary Cables From VAG 1594 To Disconnected Connector
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LED must flash

LED flashes:

Proceed with Output Diagnostic Test Mode (DTM) until completed.
Switch ignition off.
Replace solenoid valve.
See EVAPORATIVE EMISSIONS SYSTEM, OVERVIEW, VEHICLES 2000 AND UP .

LED does not flash:

Proceed with Output Diagnostic Test Mode (DTM) until completed.
Switch ignition off.
Connect test box VAG 1598/22 to control module wiring harness.

Fig 6: Connecting Test Box VAG 1598/22 To Control Module Wiring Harness

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Check wire between test box socket 15+2 pin connector contact 2 for open circuit using wiring diagram.
Wire resistance: max. 1.5 Ω
Additionally check wire for short to battery positive and Ground.
Specification: INFINITE Ω
Check wire between 2 pin connector contact 1 and Fuel Pump Relay -J17- for open circuit using wiring diagram.
Wire resistance: max. 1.5 Ω

If no wiring fault is detected:

Replace engine control module. See ENGINE CONTROL MODULE (ECM), REPLACING .

Activating Secondary Air Injection (AIR) Solenoid Valve -N112-:

Press --> key.

Indicated on display:

Fig 7: Scan Tool Display - Activating Secondary Air Injection (AIR) Solenoid Valve N112

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The secondary air injection valve must run until the next control element is activated by pressing the --> key.

If the valve does not click:

Pull connector -1- off solenoid valve -2- and connect diode test lamp VAG 1527 with auxiliary cables from VAG 1594 to disconnected connector.

Fig 8: Pulling Connector Off Secondary Air Injection Solenoid Valve

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The LED must flash

LED flashes:

Proceed with Output Diagnostic Test Mode (DTM) until completed.
Switch ignition off.
Replace secondary air injection valve -2-:
See SECONDARY AIR INJECTION SYSTEM COMPONENTS, REMOVING AND INSTALLING .

LED does not flash:

Proceed with Output Diagnostic Test Mode (DTM) until completed.
Switch ignition off.
Connect test box VAG 1598/22 to control module wiring harness.

Fig 9: Connecting Test Box VAG 1598/22 To Control Module Wiring Harness

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Check wire for open circuit between test box socket 33 and 2 pin connector contact 2 using wiring diagram.
Wire resistance: max. 1.5 Ω
Additionally check wire for short to battery positive and Ground.
Specification: INFINITE Ω
Check wire between 2 pin connector contact 1 and Fuel Pump Relay -J17- for open circuit using wiring diagram.

Wire resistance: max. 1.5 Ω

If no wiring fault is detected:

Replace engine control module. See ENGINE CONTROL MODULE (ECM), REPLACING .

Activating Secondary Air Injection (AIR) Pump Relay -J299-:

Press --> key.

Indicated on display:

Fig 10: Scan Tool Display - Output Diagnostic Test Mode/Secondary Air Injection (AIR) Pump Relay J299

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The Secondary Air Injection (AIR) Pump Relay -J299- activates the secondary air injection pump motor, and this must run at intervals until the next control element is activated by pressing the --> key.

If the Secondary Air Injection (AIR) Pump Motor -V101- does not run at intervals:

Pull 2 pin connector -1- off secondary air pump motor -2- and connect diode test lamp VAG 1527 with aux. cables from VAG 1594 to disconnected connector.

Fig 11: Pulling 2-Pin Connector Off Secondary Air Pump Motor

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The LED must flash

LED flashes:

Proceed with Output Diagnostic Test Mode (DTM) until completed.
Switch ignition off.
Replace Secondary Air Injection (AIR) Pump Motor - V101-:
See SECONDARY AIR INJECTION (AIR) SYSTEM, SERVICING .

If the LED does not flash but the secondary air pump relay clicks:

Proceed with Output Diagnostic Test Mode (DTM) until completed.
Switch ignition off.
Check the wire between Secondary Air Injection (AIR) Pump Motor -V101- and contact 1 and body Ground for open circuit.
If no fault in wire is detected:
Pull secondary air injection pump relay off relay plate in control module protective housing.

NOTE:

If tools are necessary to pull relays or control modules out of the relay plate, first disconnect battery Ground strap.
Before disconnecting battery Ground strap obtain code for radios with anti-theft coding.

Using wiring diagram check wire between Secondary Air Injection (AIR) Pump Motor - V101- contact 2 and contact 2 on relay plate for open circuit.

If no fault in wire is detected:

Using wiring diagram check voltage supply (terminal 30) for Secondary Air Injection (AIR) Pump Relay -J299-.

If voltage supply is OK:

Replace Secondary Air Injection (AIR) Pump Relay -J299-.

If the LED does not flash and the secondary air pump relay does not click:

Proceed with Output Diagnostic Test Mode (DTM) until completed.
Switch ignition off.
Pull secondary air injection pump relay off relay plate in control module protective housing.

NOTE:

If tools are necessary to pull relays or control modules out of the relay plate, first disconnect battery Ground strap.
Before disconnecting battery Ground strap obtain code for radios with anti-theft coding.

Initiate output Diagnostic Test Mode (DTM) and activate Secondary Air Injection (AIR) Pump Relay -J299-.
Using adapter cables from VAG 1594 connect diode test lamp VAG 1527 to contacts 3 and 4 on relay plate.
The LED must flash

LED flashes:

Replace Secondary Air Injection (AIR) Pump Relay -J299-.

LED does not flash:

Using adapter cables from VAG 1594 connect diode test lamp VAG 1527 to contact 3 of relay plate and body Ground.
The LED must light -up

LED does not light -up:

Check wiring for open circuit between relay plate contact 3 and fuel pump relay using wiring diagram.

LED lights up:

Proceed with Output Diagnostic Test Mode (DTM) until completed.
Switch ignition off.
Connect test box VAG 1598/22 to control module wiring harness.

Fig 12: Connecting Test Box VAG 1598/22 To Control Module Wiring Harness

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Check wire between test box socket 30 and contact 4 on relay plate for open circuit using wiring diagram.

Wire resistance: Max. 1.5 Ω

If no wiring fault is detected:

Replace engine control module. See ENGINE CONTROL MODULE (ECM), REPLACING .
Press --> key.

Indicated on display:

Fig 13: Scan Tool Display - Rapid Data Transfer

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Press keys 0 and 6 for function "End Output" and confirm entry with Q key.
Switch ignition off.

NOTE: After completion of the Output Diagnostic Test Mode (DTM) switch ignition off. If the ignition is not switched off before attempting to start, the engine will not start, as the injectors and the ignition coil will not be activated.