On-Board Monitoring
WARNING: This page is about a different car, the 2003 Jaguar XJR, 2002 Jaguar XJR, and 2001 Jaguar XJR. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition switch is set to position II (ignition ON) the TML comes on briefly and then goes off again.
When the TCM detects a fault, it stores the fault code and activates the transmission fault-warning lamp (TWL). For faults detected in less critical inputs/outputs, the TCM substitutes the faulty input/output with a default value and continues the normal mode of operation. This allows the vehicle to be driven normally, although gear change quality will be affected.