Output Diagnostic Test Mode (DTM) (Function 03)
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
NOTE:
- Output Diagnostic Test Mode (DTM) cannot be initiated, or will be interrupted if engine is running or vehicle is moving.
- Use 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):
- coolant temperature 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)
- Fuel reserve
- Oil pressure
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- lights up.
- 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 "End Output" function 06.
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.