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
- Output Diagnostic Test Mode (DTM) cannot be initiated, or will be interrupted if engine is running or vehicle is moving.
- Us the -C- button to exit the test sequence at any time.
- 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.