Transmission Driving Range Signal, Checking

NOTE:
- Through the multi-function Transmission Range (TR) program switch -F125- at the transmission, the Engine Control Module (ECM) recognizes whether a drive range is selected (selector lever in 2/3/4/R/D) or not (selector lever in P or N)
- The multi-function Transmission Range (TR) program switch -F125- at the transmission switches to Ground through terminal 22 of the ECM when the shift lever is in N or P.
- When a drive range is selected, the switch opens and terminal 22 now has power;


Required special tools and test equipment
- VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
- VAG 1598/22 test box

Test procedure
- Connect VAG 1551 or VAG 1552 scan tool and press buttons -0- and -1 - to insert "Engine Electronics" address word 01 (with engine running at idle).

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


Rapid Measuring Value Block HELP
Input display group number XXX


- Press buttons -0-, -5- and -6- to input display group number 56, and press -Q- button to confirm input.

Indicated on display (1-4 = display fields)


Read Measuring Value Block 56 ->
1 2 3 4


- Compare display with specified value in display field 4:

Display Group 56:

If displayed value is OK (as specified):
- Press -> button to advance program sequence.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.

Continuation:
If displayed value is NOT OK (not as specified):
- Connect VAG 1598/22 test box to ECM harness connector.
- Connect VAG 1527B LED voltage tester between ECM/test box sockets 3 (battery voltage, terminal 30) and 22.
- LED must come on with selector lever in P or N
- If the LED lights up continuously or does not light up at all:







- Check wiring for open circuit, short circuit to Ground or short circuit to B+ between ECM/test box socket 22 and multi-function Transmission Range (TR) program switch -F125-.

If the wiring is OK:
- Check multi-function Transmission Range (TR) program switch -F125-.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.

Explanation Of 4-digit Display: