CAR OBD CODES

OBD Code Definition

Engine-A/T-ECU Time-out (Related to Automatic Transmission)

• Malfunction Indicator Light (MIL) ON
• Function Limitation

• Component Protection active

• Learn/Disable Component Protection

• At the present time the Component Protection can only be learned/disabled using the Factory Tool in Combination with an online Connection. Every Audi Dealer/Service should be able to perform this Procedure.

The combination meter receives transmission control system-related signal from the engine-A/T-ECU via CAN bus lines. If the display unit can not receive the necessary signals, diagnosis code U1101 will be set.

Current trouble

• Connector(s) or wiring harness in the CAN bus lines between the engine-A/T-ECU and the combination meter, the power supply system to the engine-A/T-ECU, the engine-A/T-ECU itself, or the combination meter may be defective.

Past trouble

• Carry out diagnosis with particular emphasis on connector(s) or wiring harness in the CAN bus lines between the engine-A/T-ECU and the combination meter, and the power supply system to the engine-A/T-ECU. For diagnosis procedures, refer to “How to cope with past trouble” (Refer to GROUP 00 – How to Use Troubleshooting/Inspection Service Points ).
  

  note

  For a past trouble, you may not find it by the M.U.T.-III CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points . and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the diagnosis code, which is set regarding the CAN communication-linked ECUs (Refer to GROUP 54D – CAN Bus Line Diagnostic Flow ).

Use the M.U.T.-III to diagnose the CAN bus lines.

Go to Step 2.

Repair the CAN bus lines. (Refer to GROUP 54D – Troubleshooting ). Repair the CAN bus line and go to Step 6.

Check whether the A/T system diagnosis codes are set or not.

Diagnose the A/T system (GROUP 23A – Troubleshooting ).

Go to Step 3.

Check if a diagnosis code, which relates to CAN communication-linked systems below, is set.

ETACS-ECU

• Code No.12: engine-A/T-ECU time-out (related to automatic transmission)

Go to Step 4.

Go to Step 5.

Recheck if the diagnosis code is set.

(1)Erase the diagnosis code.
(2)Turn the ignition switch to “ON” position.
(3)On completion, check that the diagnosis code is not reset.

Replace engine-A/T-ECU and then go to Step 6.

A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the engine-A/T-ECU and the combination meter (Refer to GROUP 00 – How to use troubleshooting/Inspection Service Points ).

Recheck if the diagnosis code is set.

(1)Erase the diagnosis code.
(2)Turn the ignition switch to “ON” position.
(3)On completion, check that the diagnosis code is not reset.

Replace combination meter and then go to Step 6.

A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the engine-A/T-ECU and the combination meter (Refer to GROUP 00 – How to use troubleshooting/Inspection Service Points).

Recheck if the diagnosis code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch to “ON” position.
(3)On completion, check that the diagnosis code is not reset.

Go to Step 1.
The procedure is complete.