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Display on VAS5051:
- 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 to change into display group 126.
- Check under display group 126 in the same manner.
-
Press "08 - erase DTC memory" to end function -button.
Display on VAS5051:
- Select diagnostic function "06 - end output" in selection -1-.
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Display on VAS5051:
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.
If a malfunction related to the"powertrain databus" or the "CAN-bus" is
indicated:
If the correct control modules are installed: - In selection -1-, press diagnostic function "00 - Check DTC memory -
complete system".
DTC memory of all OBD capable systems in the vehicle will be
checked.
- Check whether the Engine Control Module (ECM) and other CAN
capable control modules installed are appropriate for this vehicle (part
no. and coding).
- Check to be sure the multi-pin connectors of the control modules are
securely connected.
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If you cannot determine a cause for the DTC
"Powertrain CAN-bus 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 on again.
- Leave ignition on for 10 seconds. Then, read the
DTC memory of the control module you just
connected.
- If the DTC "Powertrain CAN-bus malfunction" is
displayed, replace the control module you just
connected.
- If the DTC "Powertrain CAN-bus malfunction" is
not displayed, connect the next control module
and repeat the procedure.
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