Transmission Position Sensor/Switch: Testing and Inspection

Transmission Range Signal, Checking

Vehicles With An Automatic Transmission
Motronic Engine Control Module (ECM) -J220-receives following information from transmission control module:
Driving range selected (selector lever in 2/3/4/R/D)
or
No transmission range selected (selector lever in P or N)

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required







- VAG 1551 Scan tool (or VAG 1552) with VAG 1551/3 adapter cable

NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.

Test prerequisites







- The fuses must be OK.
- The battery voltage must be at least 11.5 V.
- All electrical accessories, e.g. lights and rear window heating must be switched off.
- If the vehicle is equipped with air conditioning, it must be turned off.
- Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.

Test sequence
- Connect VAG 1551 Scan tool (or VAG 1552) and select engine electronics control module with the "Address word" 01. When doing this the engine must be running at idle speed: ((VAG 1551 and Motronic Engine Control Module (ECM) -J220-, connecting and selecting. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks", Under Powertrain Management/Computers and Control Systems/Testing and Inspection. Testing and Inspection

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- for function "Read measured value (data) block" and confirm entry with -Q- button.

Indicated on display:


Read measured value block
Input display group number XXX


- Press buttons -0-, -5- and -6- for "Display group number 56" and confirm entry with -Q- button.

Indicated on display: (1 to 4 = display zones)


Read measured value block 56 ->
1 2 3 4


- Observe display in display zone 4 (4th digit from left).
Specification: xxx0x "Neutral"
- Depress foot brake and select driving range. Observe figure displayed in display zone 4:
Specification: xxx1x "Driving range selected"
- Press the -> button.
- Press buttons -0- and -6- for function "End output" and confirm entry with the -Q- button.
- Switch off ignition.

If the specifications are not obtained:
- Checking CAN-bus matching resistor. Refer to "Computers and Control Systems/Information Bus". Testing and Inspection
- Check DTC memory, repair malfunctions if necessary and then erase DTC memory. Refer to "Displaying and Reading Trouble Codes/With Manufacturer Scan Tool/DTC Memory Checking and Erasing",Under Powertrain Management/Computers and Control Systems/Testing and Inspection. Testing and Inspection
- Read readiness code. If the DTC memory has been erased or the Motronic Engine Control Module (ECM) -J220- was disconnected from battery positive (B+), the readiness code must be generated again.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code", Under Powertrain Management/Computers and Control Systems/Testing and Inspection. Testing and Inspection