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TCM control module, AF40 (502b)

TCM control module, AF40 (502b)

Location

TCM is mounted on top of the gearbox.

Main use

Controlling shifting points, system pressure and engagement of lock up.

Type

Microprocessor with integrated Hall sensor.



1. Rotating magnet

2. Stator magnet

3. IC circuit, Hall sensor

4. Coil


Activation

The TCM is mounted directly on top of the gearbox. The selector lever is integrated in the control module. The TCM is mounted so that the selector lever shaft goes through the control module. The selector lever position is calibrated with Tech2, there is no mechanical adjustment.

An exterior 16-pin connector connects to the car's electrical system. Underneath the control module is another connector (22-pin) that connects directly to the gearbox. TCM makes contact with all the gearbox solenoids and sensors here.

Note

Magnetic fields from e.g. magnets and from high-current cables, such as starter cables and cables to auxiliary equipment, can interfere with the gear position sensor. A rule of thumb is max 1A per mm in distance from the control module. A starter cable carrying a current of 200A must therefore be kept at least 20 cm away from the control module.


The TCM has a microprocessor with clock, RAM memory and a programmable ROM. An internal bus connects the processor and memory with the I/O unit. The I/O unit reads values from the A/D converter for analogue inputs, digital inputs and bus, as well as activates the transistors' output stages.

Adaptive values are saved in a non-volatile memory (ROM). When changing gearbox, these values must be zeroed using Tech 2. After changing TCM they will be zeroed automatically after adding the control module using the "Add" menu in Tech 2.

Power supply, ground and bus communication

Contacting the car's electrical system:

Pin no. Interface Description
9 Power ground Power supply
11 +30 Power supply
1 +15 Signal
7 P-bus + Signal to/from other control modules
6 P-bus - Signal to/from other control modules
8 P-bus + Signal to/from other control modules
14 P-bus - Signal to/from other control modules
3 Selector lever Sentronic's gear change request
16 Starter motor relay Power supply in position P/N


TCM contact directly to gearbox:

Pin no. Interface Description
1 SLT Ground
2 S2 Power supply +
3 SLT Power supply +
4 SLU Ground
5 S1 Power supply +
7 Temperature sensor Ground
8 Temperature sensor Temperature signal
9 SLU Power supply +
10 SLC1 Ground
11 SLC1 Power supply +
12 Input shaft speed Rotation speed signal
13 Input shaft speed Ground
14 SLC3 Power supply +
16 SLB1 Ground
17 SLC2 Power supply +
18 SLC2 Ground
19 Output shaft speed Rotation speed signal
20 Output shaft speed Ground
21 SLB1 Power supply +
22 SLC3 Ground



Important

When handling the control module, it is important first to create a ground connection between yourself and for example the vehicle engine. Avoid touching the pins of the control module.