Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - TRANSMISSION AND DRIVETRAINRELAYS AND MODULES - A/TCONTROL MODULEDESCRIPTION AND OPERATIONCONTROL MODULE
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Control Module
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Control Module
PURPOSE
The Transmission Control Module (TCM) controls and monitors the operation of the automatic transmission. The TCM records any faults it detects and will go into "Fail Safe Mode" to insure operation and safety of the transmission if a critical fault occurs.
OPERATION
The TCM collects information from various sensors and other control modules such as the M.P.I. Engine Control Module (ECM) for engine management information and the ABS Control Module for information about road speed. After evaluating this information, the TCM generates output signals to the actuators.
The TCM also generates output signals to the M.P.I. ECM (to retard ignition timing during upshifts and downshifts) and the A/C Control Head (to switch off the A/C compressor clutch under full throttle acceleration.)
The TCM monitors all inputs and outputs to detect any faults or values that are outside of normal operating range. It is equipped with a permanent fault memory and self-diagnosis capabilities.
If the Transmission Control Module detects a critical fault, or the TCM fails, the transmission will go into it's emergency running mode.
The Transmission Control Module (TCM) controls and monitors the operation of the automatic transmission. The TCM records any faults it detects and will go into "Fail Safe Mode" to insure operation and safety of the transmission if a critical fault occurs.
OPERATION
The TCM collects information from various sensors and other control modules such as the M.P.I. Engine Control Module (ECM) for engine management information and the ABS Control Module for information about road speed. After evaluating this information, the TCM generates output signals to the actuators.
The TCM also generates output signals to the M.P.I. ECM (to retard ignition timing during upshifts and downshifts) and the A/C Control Head (to switch off the A/C compressor clutch under full throttle acceleration.)
The TCM monitors all inputs and outputs to detect any faults or values that are outside of normal operating range. It is equipped with a permanent fault memory and self-diagnosis capabilities.
If the Transmission Control Module detects a critical fault, or the TCM fails, the transmission will go into it's emergency running mode.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.