diagram AUDI A6 1998 C5 / 2.G 01V Transmission Torque Tube Remove And Install Workshop Manual
Page 3 of 10
01-265
Two-wire bus system, checking
If the DTC table indicates to check the bus:
- Use the applicable wiring diagram, determine
how many control modules communicate with
each other via the bus.
- Press the -0- button twice to select the function
"Automatic test sequence".
- Before checking the bus wires, make sure that
none of the control modules connected are
malfunctioning.
A malfunction will disrupt communication to
other control modules.
Is there a malfunction?
- Fix the malfunction before proceeding.
- Note malfunction and erase DTC memory of all
control modules Checking and erasing DTC
memory of the relevant control module.
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Two control modules communicate via a
"two-line bus system"
- Switch ignition off.
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Disconnect both control modules.
- Check bus wires for open circuit.
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Check whether there is a short circuit between bus wires.
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Three or more control modules are
communicating across a "two-line bus
system"
- Analyze DTCs stored in the memories of the
control modules.
Example 1:
From the DTCs stored in the memories, determined that control module 1
is not communicating with control modules 2 and 3.
Electrical Wiring Diagrams, Troubleshooting & Component Locations Control module
DTCs stored in DTC memories:
1
Missing signal from control module 2Missing signal from control module 3
2 Missing signal from control module 1
3 Missing signal from control module 1
- Switch ignition off.
- Disconnect the control modules connected across the bus wires and
check bus wires for open circuit. - Replace control module 1 if bus wires are OK.
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Example 2:
From the DTCs stored in the memories, determined that control module 2
is not communicating with control modules 1 and 3.
Electrical Wiring Diagrams, Troubleshooting & Component Locations Control module
DTCs stored in DTC memories:
1
Missing signal from control module 2
2 Missing signal from control module 1Missing signal from control module 3
3 Missing signal from control module 2
- Switch ignition off.
- Disconnect the control modules connected across the bus wires and
check bus wires for open circuit. - Replace control module 2 if bus wires are OK.
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Page 9 of 10
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Example 3:
Using DTCs stored in the memories, determined
that none of the control modules are sending or
receiving signals.
Control
module DTCs stored in DTC
memories:
1
Hardware faulty
2 Hardware faulty
3 Hardware faulty
- Switch ignition off.
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Disconnect the control modules connected across the bus wires and
check for a short circuit between the bus wires.
- Check bus wires for short circuit to B+ or Ground (GND).
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bus, function
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