Automatic Transmission Selector Lever Position Signal, Checking
NOTES:
- The multifunction Transmission Range (TR) switch -F125- at the transmission switches to Ground at Engine Control Module (ECM) terminal B11 when the selector lever is in the P (Park) or N (Neutral) positions.
- The ECM sends a signal (via terminal C16) to the shiftlock relay. If one or both connections are interrupted, the engine cannot be started.
- When a transmission drive range is selected, ECM terminal B11 is switched to B+.
- The signal is not processed via ECM terminal B11, but is transmitted through the CAN-Bus.
- Connect VAG 1551 (VAG 1552) Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (engine running at idle). [1][2]Scan Tool Connecting and Initial Checks
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
- Press buttons -0-, -2- and -1- to input display group number 21, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block 21 ->
1 2 3 4
- Check specified values for automatic transmission selector lever position (display field 1):
Specified value in display field 1: "Neutral"
- Press brake pedal and select transmission drive range.
Specified value in display field 1: "1st TR"
If display is not as specified:
- Connect VAG 1598/19 test box to ECM harness connector. Connecting VAG 1598/19 Test Box
- Connect VAG 1527 LED voltage tester between ECM/test box sockets D9 (B+, terminal 30) and B11.
LED must go out when a transmission drive range is selected.
If LED does not go out, and the display is not OK:
- Disconnect harness connector from multifunction Transmission Range (TR) switch.
- Check wiring for open or short circuits.
See Electrical Wiring Diagrams, Troubleshooting and Component Locations.
If wiring is OK:
- Check multifunction TR switch.