Output Diagnostic Test Mode (DTM) (Function 03)
Output Diagnostic Test Mode (DTM), (function 03)
The Output Diagnostic Test Mode is part of the electrical check. The following components can be checked by the Output Diagnostic Test Mode (DTM):
- Speedometer
- Tachometer
- Coolant temperature gauge
- Fuel gauge
- Malfunction lamps
- Seat belt warning lamp (when activated using code)
- Buzzer/Gong
- Displays (odometer, multi-function indicator or digital clock, selector lever position display for automatic gearboxes)
- If 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 -C- button to exit test sequence at any time.
- Connect VAG 1551 Scan Tool (ST), input address word 17 "Instrument cluster".
After control module identification and immobilizer identification number is displayed:
- Press -> button.
Indicated on display (select function):
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -3- to select function 03 "Output Diagnostic Test Mode (DTM)".
Indicated on display
Rapid data transfer Q
03 - Output Diagnostic Test Mode
- Press -Q- button to confirm input. No indication on all displays and all warning lights to be checked are unlit.
Indicated on display
Rapid data transfer ->
Analog display
After pressing -Q- button, the following instrument functional checks are carried out.
- Tachometer needle moves over complete display range
- Speedometer needle moves over complete display range
- Coolant temperature needle moves over complete display range
- Fuel gauge needle moves over complete display range
NOTE:
- On VDO instrument clusters, the instruments are activated simultaneously
- On MMO instrument clusters, the instruments are activated sequentially
After all instrument display range checks, the following constant values are displayed:
Coolant temperature gauge: 90 °C
Tachometer: 3000 rpm
Speedometer: 100 km/h (65 mph)
Fuel gauge: 1/2
- Press -> button.
Indicated on display:
Output Diagnostic Test Mode ->
Warning lamp test Combi instrument
The warning lamps are activated and light continuously (includes all warning lamps for vehicle equipment having output DTM capability coded into the instrument cluster
- Press -> button.
Indicated on display:
Output Diagnostic Test Mode ->
Seat belt warning lamp - K19
Seat belt warning lamp -K19- lights (when activated by code).
- Press -> button.
Indicated on display:
Output Diagnostic Test Mode ->
Gong
The buzzer/gong is activated and a warning tone is emitted at intervals.
- Press -> button.
Indicated on display:
Output Diagnostic Test Mode ->
Segment test
All liquid crystal segments in the speedometer display and tachometer are activated and appear on the display.
- Press -> button.
Indicated on display:
Output Diagnostic Test Mode ->
Coolant, excessive temp test
VDO Instrument cluster:
No display in instrument cluster!
High coolant temperature cut-out for the A/C clutch is activated approx. 5 seconds later.
MMO Instrument cluster:
Coolant temperature warning lamp lights and warning tone sounds.
High coolant temperature cut-out for the A/C clutch is activated approx. 5 seconds later.
- Press -> button.
Indicated on display for instrument clusters with manufacturer code MMO:
Output Diagnostic Test Mode ->
END
Indicated on display for instrument clusters with manufacturer code 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 (select function):
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -6- to select function 06 "End output".
Indicated on display:
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06 - End output
- Press -Q- button to confirm entry.
Indicated on display:
Rapid data transfer HELP
Enter address word XX
Tester is again in basic function.