A/T Controls - A/T In Emergency Mode/DTC P1744

38 08 14

2002313/3

December 16, 2008.

Supersedes Technical Service Bulletin Group 38 number 07-05 dated August 9, 2007 for reasons listed below.





Affected Vehicles

37 Transmission in Emergency Running Mode

Condition





- Vehicle in Emergency Running Mode.

- With headlights switched on:

- Headlight functions are normal.

- The normal shift display and Tiptronic shift display on the shifter console are brightly illuminated at same the time. (Normally, only the selected mode is brighter with headlights switched on.)

- In addition, DTC P1744 may be stored in DTC memory.

Technical Background

Wiring harness with diode introduced to prevent possible electrical feedback to transmission control unit.

Production Solution

Improved production.

Service

Verify condition by performing the following:

1. Switch headlights off.

2. Cycle ignition key off, then on and restart vehicle.

3. Select Tiptronic shifting mode.

4. Switch headlights on.

- Only the + / - for Tiptronic on the shift console are brightly lit.

- Tiptronic shifting mode will operate without transmission going into Emergency Running Mode.

5. Shift from Tiptronic mode into drive "D" (normal mode).

- Vehicle goes into Emergency Running Mode.

- Both Tiptronic and normal display lights are brightly lit.

6. Switch headlights and ignition off.

7. Replace shifter harness and transmission control module as follows:

a. Remove center console. (See Center console, removing and installing in Repair Manual A8 Body Interior, Repair Group - 68.)

b. Install new shifter harness (Figure 1, K), Part No: 4D0 971 697G. (See Selector lever mechanism and controls, disassembling and assembling in Repair Manual, A8 5 Spd. Automatic Transmission 01L All Wheel Drive, Repair Group - 37, Selector lever mechanism and controls, servicing.)

Figure 1:

1. Install center console. (See Center console, removing and installing in Repair Manual A8 Body Interior, Repair Group - 68.)

NOTE: To ensure proper function of the accelerator kickdown, turn pedal stop as outlined in console removal and installation procedure.

a. Replace Transmission Control Module (TCM). (See Removing and installing Transmission Control Module (TCM) -J217- in Repair Manual, A8 5 Spd. Automatic Transmission 01L All Wheel Drive, Repair Group - 01, Electrical and electronic components, locations.)





Warranty

All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.