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Read Measurin
g Value Block
Q
Input display group number XXX
When indicated on display:
- Press buttons -0-, -6- and -6- to select "display group number 066" and
press -Q- button to confirm input.
Read Measuring Value Block 66
1
2
3
4
Indicated on display:
- Check brake light/brake pedal switch in display field 2.
Display fields
1 2 3 4
Display group 066: Signals to Engine Control Module (ECM)
Display xxx km/h
XXXX xxx km/h XXXX
Indicated ACTUAL speed
Switch positions SPECIFIED speed Switch positions
Functional range
XX00
XX11
Specified value
XX00
(with brake pedal
not operated)
XX11
(with brake pedal
operated)
Notes
Value:
X = no significance.
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Clutch vacuum vent valve switch -F36-,
checking
Note:
This signal helps prevent excessive RPM
oscillations and tip-in shocks when clutch is
disengaged and is required for the cruise control
system.
Test sequence
- Connect VAS5051 tester or VAG1551 scan tool
and select the control module for engine
electronics using "address word" 01 Page 01
-
9 .
Ignition must remain switched on for this.Rapid data transfer
HELP
Select function XX
When indicated on display:
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read Measurin
g Value Block
Q
Input displa
y group number XXX
When indicated on display:
- Press buttons -0-, -6- and -6- to select "display group number 066" and
press -Q- button to confirm input.
Read Measuring Value Block 66
Indicated on display:
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1
2
3
4
- Check Clutch Pedal Position (CPP) switch in display field 2.
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Display fields
1 2 3 4
Display group 066: Signals to Engine Control Module (ECM)
Display xxx km/h
XXXX xxx km/h XXXX
Indicated ACTUAL speed
Switch positions SPECIFIED speed Switch positions
Functional range
X0XX
X1XX
Specified value
X0XX
(at clutch pedal
not operated)
X1XX
(at clutch pedal
operated)
Notes
Value:
X = no significance
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Rapid data transfer
HELP
Select function XX
When indicated on display:
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read Measuring Value Block
Q
Input displa
y group number XXX
When indicated on display:
Note:
Measuring value blocks 125 and 126 indicate the components that are
part of the powertrain data bus. - Press buttons -1-, -2- and -5- to select "display group number 125" and
press -Q- button to confirm input.
- Check indications in display fields 1 through 4.
CAN capable control modules connected to the Engine Control Module
(ECM) are indicated:
No indication: Control module not CAN capable
Indication 1: CAN capable control module is connected to databus
Indication 0: CAN capable control module is not connected to
databus
-
Press button.
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Rapid data transfer
HELP
Select function XX
When indicated on display:
- Press buttons -0- and -6- to select "End output" and press -Q- button to
confirm input.
Rapid data transfer
HELP
Insert address word XX
When indicated on display:
When a control module responds with its identification, the display
indicates the number of stored errors or indicates "no malfunctions
recognized".
DTCs stored in the system are indicated in sequence and printed out.
Then the VAG1551 scan tool sends the next address word. - Press button 0- twice to select "Automatic test sequence", address
word 00. Press -Q- button to confirm input.
DTC memory of all OBD capable systems in the vehicle will be
checked.
V.A.G - ON BOARD DIAGNOSTIC
HELP
1 - Rapid data transfer*2 - Blink code output*
The automatic test sequence is over when the following indication
appears on the display:
If a malfunction related to the"powertrain databus" or the "CAN-bus" is
indicated:
- Check whether the Engine Control Module (ECM) and other CAN
capable control modules installed are appropriate for this vehicle (part
no. and coding).
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If you cannot determine a cause for the DTC
"Powertrain databus malfunction, check
whether the DTC is caused by one of the
control modules.
All control modules that use the CAN-bus are still
disconnected. Ignition is switched off.
- Connect one of the control modules.
- Connect VAG 1551 scan tool. Switch ignition on,
and erase the DTC memory of the control
module you just connected. End scan tool output
using the "End Output" function 06.
- Switch ignition off and then on.
- Leave ignition on for 10 seconds. Then, read the
DTC memory of the control module you just
connected.
- If the DTC "Powertrain databus malfunction" is
displayed, replace the control module you just
connected.
- If the DTC "Powertrain databus malfunction" is
not displayed, connect the next control module
and repeat the procedure.
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