Control Module: Testing and Inspection

Diagnostic Procedures




TCM Voltage Supply, Checking



Special tools, testers and auxiliary items required

• V.A.G. 1526 A multimeter





• V.A.G 1594 A connector test kit





• Transmission electronics fuse OK

• Ground connections on engine and transmission OK.

• Battery voltage at least 12.5 V

• Alternator OK

• Ignition switched off.

Test Sequence

CAUTION!
• Only touch Mechatronic electrical connector after you have discharged electrostatically on a grounded object, e.g. skin contact with vehicle Ground (GND).

• The connector terminals in the 16-pin wiring harness connector from transmission housing to Mechatronic must not be touched with the hands for any reason. The control module and Mechatronic could be destroyed by static discharge.

• No measuring instruments should be connected to the 16-pin connector of the wiring harness from transmission housing to Mechatronic.

- Touch vehicle Ground (GND) with your hand (without gloves) to discharge static.

- Disconnect electrical harness connector on transmission, to do this turn plug counterclockwise - arrow -.





- Connector multimeter for voltage measurement to vehicle wiring harness 16-pin connector as follows:









• Specification: approx. battery voltage

- Connect multimeter for voltage measurement as follows:









- Switch ignition on.

• Specification: approx. battery voltage respectively

- Switch ignition off.

If specifications are not obtained:

- Check wire connections for open circuit according to wiring diagram:

• Specification: Wire resistance max 1.5 ohms

- If necessary, repair wire connection.

Final procedures

After repair work, the following work steps must be performed in the mentioned sequence:

1 Check DTC memory => " "Mode 3: Check DTC memory", page.
2 If necessary, erase DTC memory => " Mode 4: Reset/erase diagnostic data", => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.
3 If DTC memory was erased, generate readiness code => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End diagnosis and switch ignition off.