check engine AUDI A6 1996 C5 / 2.G 01V Transmission OBD Functions Workshop Manual

01-2
If a malfunction is no longer present after a
certain time or a long drive, it will be converted to
a sporadic (SP) DTC.
A malfunction will also be converted to sporadic
when the DTC memory is not erased after
repairs.
Malfunctions which are stored in the memory as
sporadic malfunctions, will be displayed as
"sporadic DTCs" when checked by the scan tool
V.A.G 1551. In such cases "SP" appears on the
right of the display. If the printer is switched on,
the print-out will show "sporadic DTC" after the
identification of the malfunction.
If the sporadic DTC does not occur again after 40
cold engine starts and subsequent transmission
warm-up, the malfunction in DTC memory will be
automatically erased.
The possibilities offered by On Board Diagnostic
can only be used with the Vehicle Diagnostic,
Testing and Information System VAS 5051 or the
V.A.G 1551 scan tool (mode 1, rapid data
transfer).
Available functions of Vehicle Diagnostic, Testing
and Information System VAS 5051 or the
V.A.G1551 scan tool page 01
-42
.
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01-4

- The Multi-function Indicator Light (MIL) lights up
after 2 driving cycles (Dcy); check DTC memory
( page 01
-43
and compare with DTC table
page 01
-45
).
If the TCM -J217- malfunctions (e.g. if the power
supply is faulty or the connector becomes
disconnected), the transmission will immediately
switch to "mechanical back-up mode with
inactive control module" and continue to
operate.

Mechanical backup with non-active control
module

- The transmission shifts out of all forward gears
into hydraulic 4th gear. The torque converter
clutch is unlocked (not applied). All solenoid
valves are de-energized.

- Maximum shift pressure is applied to the power-
transmitting elements.

- Reverse gear can be engaged. The shift lock
solenoid is active (in "P" and "N").

- All of the segments transmission range selector lever display are dark.
-
The MIL lights up when the Engine Control Module (ECM) has
recognized a CAN-bus malfunction (missing data exchange between
engine and transmission control modules) (after 2 Dcy); check DTC
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01-5

Malfunction Indicator Lamp (MIL)
function, checking

If emissions malfunctions are recognized by the
TCM, the Malfunction Indicator Lamp (MIL) will
be switched on.

Location of the MIL: integrated in speedometer in instrument cluster
Notes:
When the MIL is switched on, it will either blink or light continuously. The
DTC memory for the TCM must be checked page 01
-43
.
MIL flashing: there is a malfunction that could damage the Three Way
Catalytic Converter (TWC). In this case, drive only with reduced
power. MIL continuously on: there is a malfunction that degrades emissions.
Check DTC memory of the Engine Control Module (ECM) or the TCM. If there are driveability problems (e.g. a customer complaint) and the
MIL is not on, perform the MIL functional because malfunctions can be
stored that do not switch the MIL on.
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01-6

MIL functional check

- Switch ignition on: MIL must come on.

If the MIL does not come on when the ignition is
switched on (with the engine not running):
Check DTC memory page 01
-43
. If
necessary, check wiring per wiring diagram or
replace light bulb.

- Start engine and let idle: MIL must switch off
after several seconds.

If the MIL does not switch off after the engine is
started: Check DTC memory page 01
-43
.
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pair&id=AUDI.B5.AT02.01.1