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Home >> Jaguar >> 2005 >> XJR >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Servicing >> Descriptions & Operation >> Transmission Control Module (TCM) & Main Control Valve Body >> Transmission Electronic System >> Supply Monitoring
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Supply Monitoring

If the battery voltage is either too great or too low, the TCM will detect a fault condition. For the TCM to be able to identify this fault, the engine must be running and the transmission fluid temperature sensor must be functioning correctly.