Output Diagnostic Test Mode (DTM) (function 03)

The Output Diagnostic Test Mode (DTM) is part of the electrical check. The following components and systems are checked via Output DTM:

• Speedometer
• Tachometer
• Engine Coolant Temperature (ECT) gauge
• Fuel gauge

• Brake system warning lamp
• Seat belt warning lamp
• Buzzer
• All liquid quartz displays (LCD): odometer, multi-function indicator (MFI) or digital clock & selector lever position display (automatic transmission)

• Engine Coolant Temperature (ECT) & low coolant indicator warning lamp
• Brake pad wear warning lamp (where applicable)
• Fuel reserve warning lamp
• Oil pressure warning lamp

• If a malfunction is determined when performing Output DTM, exchange instrument cluster.
• If no malfunction is determined when performing Output DTM, check wiring and connections to instrument cluster using wiring diagram.

Output Diagnostic Test Mode (DTM), initiating 

• Connect scan tool VAG 1551, select operating mode 1 "Rapid data transfer", switch on ignition and enter address word 17 "instrument cluster".
• Press -Q- button to confirm input.
• Press → button until "Select function" is shown in display.

Indicated on display:

Rapid data transfer HELP Select function XX

• 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

• Press -Q- button to confirm input.

Indicated on display

Rapid data transfer → Analog display

After pressing the -Q- button, the following instrument functional checks are carried out simultaneously on VDO instrument clusters and sequentially on Motometer instrument clusters (press → button to advance through test sequence):

• Engine Coolant Temperature (ECT) Gauge needle moves over complete display range
• Tachometer needle moves over complete display range
• Speedometer needle moves over complete display range
• Fuel gauge needle moves over complete display range

After sweep of display ranges, the following fixed values are displayed:

Coolant temperature gauge:	90 ° C
Tachometer:	3000 rpm
Speedometer:	100 km/h (62mph)
Fuel gauge:	1/2

• Press → button.

Indicated on display:

Output Diagnostic Test Mode → Combi instrument warning lamp test

The warning lamps for

• Brake system (low brake fluid level, ABS inoperative)
• Coolant temperature/low coolant level indicator
• Brake pad wear (where applicable)1)
• Fuel reserve

• Oil pressure
• Low washer fluid level (where applicable)1)

are activated and remain constantly lit.

• Press → button.

Indicated on display:

Output Diagnostic Test Mode → Seat belt warning lamp - K19

The Seat Belt Warning Light -K19-1) lights up.

1) Instrument cluster must be coded accordingly in order for these warning/indicator lights to function. Applications: vehicles 05.99 >05.00. Refer to Instrument cluster 05.99 > 05.00, coding (function 07)  , vehicles 05.00 >. Refer to Instrument cluster 05.00 >, coding (function 07)  .

• Press → button.

Indicated on display:

Output Diagnostic Test Mode → Signal

The buzzer/chime is activated: a warning tone sounds in intervals.

• Press → button.

Indicated on display:

Output Diagnostic Test Mode → Segment test

All segments of LCD display in speedometer and tachometer are activated and become visible.

• Press → button.

Indicated on display:

Output Diagnostic Test Mode → Coolant, excessive temp test

Instrument cluster VDO:

Safety cut-off (A/C compressor cut-off- is activated approx. 5 seconds later (vehicles with A/C only)

No indication is given in instrument cluster!

Instrument cluster MMO:

Engine Coolant Temperature (ECT) warning lamp lights and warning sound is given.

Safety cut-off (A/C compressor cut-off- is activated approx. 5 seconds later (vehicles with A/C only)

• Press → button.

Indicated on display:

Output Diagnostic Test Mode → END

• Press → button.

Indicated on display, instrument cluster MMO:

Output Diagnostic Test Mode → END

Indicated on display, instrument cluster VDO:

Function is unknown or → cannot be carried out at the moment

End Output Diagnostic Test Mode for VDO instrument clusters by pressing → button.

All actual values are displayed again.

Indicated on display:

Rapid data transfer HELP Select function XX

• Press buttons -0- and -6- to select function 06, "End Output".

Indicated on display:

Rapid data transfer Q 06 - End Output

• Press -Q- button to confirm input.

Indicated on display:

Rapid data transfer Help Enter address word XX

The tester is now in basic function again.