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ROYAL ENFIELD VEHICLE SERVICE MANUAL - EURO IV
208
EMS FAULT DIAGNOSIS & TROUBLE SHOOTING
NOTE:
During diagnosis the motorcycle should be parked in its center stand, the side stand in fully retracted position
and with the gears in neutral .
The battery should be in fully charged and proper working condition.
There should be no external electrical sources or interferences near the motorcycle.
TYPES OF DIAGNOSIS
There are three levels of identifying a malfunction in the ECU or the sensors.
LEVEL 1 VISUAL
As soon as the ignition switch, engine stop switch are in ON position and the side stand is in fully retracted position,
the MIL will glow and will switch OFF after a few seconds after the engine is started. This indicates the EMS system is
in its auto diagnostic mode and the EMS is working perfectly.
In the event the MIL glows continuously and does not switch off, it indicates a malfunction in the EMS.
LEVEL 2 TEST PIN
In the event the MIL is continuously ON and does not switch OFF, the test pin method will help narrow down to the
sensor / electrical connection that caused the malfunction.
LEVEL 3 GENERIC SCAN TOOL (NACS II DIAGNOSTIC TOOL)
A generic scan tool supplied by Royal Enfield will help identify the exact cause of the malfunction in the EMS, when
connected between the motorcycle and a computer.
The tool will take inputs from the ECU and provide to the computer to display the defect code that will help identify
the specific sensor/connections.
In addition the generic scan tool can also help download the history of the vital parameters of the EMS, engine
performance and earlier defects for detailed analysis and records.
The generic scan tool will also be able to erase previous defects after the same has been rectified.
METHOD OF CHECKING
LEVEL 1 VISUAL
Switch OFF the ignition and engine stop switch.
Check for any loose coupler connections at the sensor end. Correct loose connections if any.
Switch ON ignition and engine stop switch. Ensure side stand is fully retracted.
Check for MIL Indication in the cluster/Console.
- Start the engine.
- Allow engine to run in idling RPM for about 30 seconds and switch off engine.
- Repeat the above process for 2 more times.
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