Speed, lead from ABS (TC/ABS)
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Speed, lead from ABS (TC/ABS)
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The ABS or TC/ABS control module sends a speed signal to pin 64 on the Trionic T7 control module. The signal is a square wave and fluctuates between 0V and B+ 29 times per wheel rotation. This speed signal is used to:
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prevent adaptation of idle speed control when the car is moving.
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determine on manual gearboxes the gear position currently being used. This enables torque limitation in gears R and 1, and activation of fuel shut-off in gears 2, 3, 4 and 5. In addition, the control of the SHIFT UP lamp is dependent on the current gear position.
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activate speed limitation by limiting the maximum air mass/combustion at 240 km/h.
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If there is no speed signal, diagnostic trouble code P0502 will be generated.
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If the speed value is implausible, diagnostic trouble code P0501 will be generated.
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System reaction to a fault
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The speed (bus from MIU) is used as a substitute value.
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Cruise control is blocked.
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