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Output Diagnostic Test Mode (DTM) (Function 03)



Output Diagnostic Test Mode (DTM) (scan Tool Function 03)

Output Diagnostic Test Mode, initiating
Output Diagnostic Test Mode (DTM) activates 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-

Special tools and equipment
- Scan tool VAG 1551 or VAG 1552 with cable VAG 1551/3
- Test box VAG 1598/22
- Hand multimeter VAG 1526 or multimeter VAG 1715
- Diode test lamp VAG 1527
- Adapter set VAG 1594
- Wiring diagram

Test conditions
- The fuses 10, 28, 29, 32 and 43 must be OK.

NOTE:
- The Output Diagnostic Test Mode (DTM) can only be carried out if the engine is stationary and ignition switched on.
- The Output Diagnostic Test Mode (DTM) will be aborted if the engine is started or a rotational impulse is recognized.
- During the Output Diagnostic Test Mode (DTM) the individual final controls will be activated until advancing to the next final control by pressing the -> button.
- The final controls are checked acoustically or by touching.
- If it is necessary to repeat the Output Diagnostic Test Mode (DTM), without first running the engine briefly, switch the ignition off for approx. 2 seconds.
- The electric fuel pump will run during the complete Output Diagnostic Test Mode (DTM).
- The Output Diagnostic Test Mode (DTM) will be aborted after 10 minutes.

Work sequence
- Connect VAG 1551 Scan Tool ((VAG 1552). Switch ignition on and select engine control module with "Address word" 01.

Indicated on display:

Rapid data transfer HELP
Select function XX

- 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:

Rapid data transfer Q
03 Output Diagnostic Test Mode

Activate fuel injectors -N30- through -N33-:
- Confirm input with Q key.

Indicated on display:

Output Diagnostic Test Mode ->
Injector cylinder 1 -N30

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.

- 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. Testing and Inspection

Activating EVAP Canister Purge Regulator Valve -N80-:
- Press -> key.

Indicated on display:

Output Diagnostic Test Mode ->
EVAP canister purge regulator valve -N80

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.

LED must flash

LED flashes:
- Proceed with Output Diagnostic Test Mode (DTM) until completed.
- Switch ignition off.
- Replace solenoid valve.

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

If no wiring fault is detected:
- Replace engine control module.

Activating Secondary Air Injection (AIR) Solenoid Valve -N112-:
- Press -> key.

Indicated on display:

Output Diagnostic Test Mode ->
Secondary air inlet valve -N112

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.

The LED must flash

LED flashes:
- Proceed with Output Diagnostic Test Mode (DTM) until completed.
- Switch ignition off.
- Replace secondary air injection valve -2-:

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

If no wiring fault is detected:
- Replace engine control module.

Activating Secondary Air Injection (AIR) Pump Relay -J299-:
- Press -> key.

Indicated on display:

Output Diagnostic Test Mode ->
Secondary air pump relay -J299

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.

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-:

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 malfunction 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 (GND) 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 (GND) strap.
- Before disconnecting battery Ground (GND) 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.
- Check wire between test box socket 30 and contact 4 on relay plate for open circuit using wiring diagram.
Wire resistance: Max. 1.5 Ohm

If no wiring malfunction is detected:
- Replace engine control module.
- Press -> key.

Indicated on display:

Rapid data transfer HELP
Select function XX

- 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.
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