Transmission Position Sensor/Switch: Testing and Inspection

Selector Lever Position Signal, Checking


Only for vehicles with automatic transmission

The Engine Control Module (ECM) receives the following information from the transmission control module:
- Driving position selected (selector lever in 2/3/4/R/D) or
- no driving position selected (selector lever in P or N)

Special tools and equipment

- VAG 1551 Scan Tool (or VAG 1552 mobile scan tool) with VAG 1551/3 cable
- VAG 1598/31 test box
- VAG 1526 multimeter or VAG 1715 multimeter
- VAG 1594 connector test kit
- Wiring diagram

Test condition

- Selector lever of automatic transmission must be in "P" or "N".

Test sequence

- Connect VAG 1551 scan tool (VAG 1552). Switch ignition on and select Engine Control Module (ECM) using address word 01. Refer to Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1551 Scan Tool Testing and Inspection

Indicated on display


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.

Indicated on display


Read Measuring Value Block HELP
Input display group number XXX


- Press 0, 5 and 6 for the function "display group number 56", and then press Q to exit from input mode.

Indicated on display (1 - 4 = display fields)


Read Measuring Value Block 56 ->
1 2 3 4


- Observe display field 4. Reading should be

Specification: x x x 0 x "Neutral" on display.

- Press brake pedal and select driving position. Reading should be

Specification: x x x 1 x "Drive Pos. ON" on the display.

- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
- Switch ignition off.

If reading does not change:
- Test databus Testing and Inspection