On-Board Monitoring

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.