A8 Quattro Sedan V8-4.2L (BVJ) (2008)
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Control Module: Testing and Inspection
Transmission Control Module, Checking Voltage Supply
Transmission Control Module, Checking Voltage Supply
‹› The Transmission Control Module (TCM) (J217) is a component of the Mechatronic unit in the transmission and cannot be serviced individually.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Requirements
‹› The Transmission Control Module (TCM) (J217) fuses OK.
‹› The battery voltage must be at least 12.5 volts.
‹› The Ground (GND) connections at the transmission OK.
‹› The parking brake engaged.
‹› The selector lever of automatic transmission in position "P".
‹› All electrical consumers switched off.
‹› The ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check.
Start diagnosis
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Disconnect the Transmission Control Module (TCM) (J217) electrical harness connector - direction of the arrow -.
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Check the electrical harness connector for damage, contact corrosion, or ingress of water.
If the electrical harness connector is not OK:
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Repair the malfunction.
If the electrical harness connector is OK:
Checking voltage
