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Transmission control module, TCM, AF 40 (502b), E39

Transmission control module, TCM, AF 40 (502b), E39

Location

TCM is mounted on top of gearbox.

Main task

To control shifting points, system pressure and engagement of lock-up.

Type

Micro processor with integrated Hall sensor.

Connection

TCM is mounted directly on top of the gearbox. The gear selector is integrated in the control module. TCM is mounted so that the gear selector shaft goes through the control module. The position of the gear selector is calibrated with Tech 2 but there is no mechanical adjustment.

On the bottom of the control module is a 22-pole connector that connects directly to the gearbox. The TCM terminates to all the gearbox solenoids and sensors here.

Note

The gear selector position sensor can sustain interference from magnetic fields such as magnetic pickup tools and high current cables, e.g. starter cables or wires to auxiliary equipment.


The TCM has a micro processor. Adaptive values are stored in a non-volatile memory. When changing the gearbox, these values should be reset with Tech 2. After changing the TCM, the values will reset automatically when the new control module is added in the "Add" menu in Tech 2.

Power supply, ground and bus communication

Terminating with the electrical system in the car:

Pin No. Interface Description
9 Grounding point G1 Power supply
11, 12 +15 Power supply
1 BATT+ Power supply
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
5 Signal Connected to control module, E39, pin 58(B).


TCM termination 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 Engine 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 Engine 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.