Transmission Range Signal, Checking
Transmission Range (TR) signal, checking
The Engine Control Module (ECM) receives the following information from the automatic Transmission Control Module (TCM):
- Driving range selected (selector lever in 2/3/4/R/D)
- No driving range selected (selector lever in P or N)
Special tools and equipment
- VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
- VAG1598/22 test box
- Multimeter US1119 (Fluke 83 or equivalent)
- VW1594 connector test kit
- Wiring diagrams
Checking conditions
- Automatic transmission selector lever in "P" or "N" position
Test procedure
- Connect VAG1551 or VAG1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with ignition on), Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1551/VAG1552 Scan Tool" under "Engine", 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, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block HELP
Input display group number XXX
- Press buttons -0-, -5- and -6- to input display group number 056 (056), and press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 56 ->
1 2 3 4
- Check specifications in display field 4.
If the specifications are attained:
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Switch ignition off.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Checking, Readiness Code",under "Engine" Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code" under "Engine" Testing and Inspection
Explanation of 4-digit display in display field 4, display group 56
Continuation
If the specification is not attained:
If the display does not change:
- Connect VAG1598/22 test box to ECM harness connector.
- Check wiring for open circuit between ECM/test box (sockets 29 and 41) and TCM using appropriate wiring diagram.
- Specified value: max. 1.5 Ohms
If the wiring is OK:
- Replace TCM -J217-.
If the display does not change again after replacing the TCM:
- Replace Motronic ECM -J220-.