Engine Management System Diagnostics - Triumph Scrambler 1200 XC Service Manual

1. Refit the engine ECM and its bracket to the frame under the seat (see Engine
Electronic Control Module (ECM) - Installation).
System Diagnostics
The engine management system has an on-board diagnostics feature which allows
service technicians to retrieve stored data from the ECM using Triumph diagnostic
software. Full details of the Triumph diagnostic software operation and how to
interpret the results are given in the Triumph Diagnostic Tool User Guide.
The software is connected, via an interface cable, to the motorcycle using a dedicated
diagnostic plug situated behind the left hand side panel. By using a dedicated plug,
no electrical connectors associated with the system are disturbed, reducing potential
connector damage.
The software allows the user to retrieve data associated with the system sensors
and actuators, test various component functions, read build data and make minor
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
Service Manual - Scrambler 1200 XC
ciji_1
1. Connector B (large)
2. Connector A (small)
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