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adjustments to the set-up of the system. The data and tests available are described on
the following pages.
On-board Fault Detection System
The on-board diagnostic system has two stages to fault detection. When a fault is
detected, the DSM (Diagnostic Status Manager) raises a flag to indicate that a fault is
present and increments a counter. The counter checks the number of instances that the
fault is noted. For example, if there is a fault in the crankshaft position sensor, the
counter will increment its count each time the crankshaft turns through 360°, provided
the fault is still present.
When the count begins, the fault is detected but not confirmed. If the fault continues to
be detected and the count reaches a predetermined threshold, the fault becomes
confirmed. If the fault is an emissions related fault or a serious malfunction affecting
engine performance, a DTC (Diagnostic Trouble Code) and freeze-frame data will be
logged in the ECM's memory and the MIL (Malfunction Indicator Lamp) on the
motorcycle instrument panel is illuminated. Once a fault is confirmed, the number of
warm-up cycles made by the engine is counted. If the fault clears, the warm-up cycle
counter will extinguish the MIL (Malfunction Indicator Lamp) at a predetermined count,
and erase the DTC and freeze-frame data from the ECM memory at another (higher)
count.
A single warm-up cycle is deemed to have taken place when the following criteria have
been met:
• The coolant temperature must be raised to 72°C or more.
• The coolant temperature must have risen by 23°C or more from its start
temperature, when 72°C is reached.
• A controlled power down sequence must take place.
When a fault has been rectified, the MIL will remain illuminated until sufficient non-
fault warm-up cycles have taken place to turn it off. The MIL will be immediately
extinguished if, after first rectifying the fault, the DTC (diagnostic trouble code) that
caused the MIL illumination is erased from the ECM memory using the Triumph
diagnostic software.
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