Eps Control Unit's Self-Diagnostic Function - Yamaha YFM7FGPW Service Manual

EPS (ELECTRIC POWER STEERING) SYSTEM

EPS CONTROL UNIT'S SELF-DIAGNOSTIC FUNCTION

The EPS control unit is equipped with a self-diagnostic function. If this function detects a malfunc-
tion in the EPS system, it lights the EPS warning light to alert the rider that a malfunction has
occurred in the system. Once a malfunction has been detected, it becomes stored in the EPS con-
trol unit memory in the form of a fault code.
1 EPS warning light
NOTE:
• If the engine is stopped using the engine stop switch and the main switch is in the "ON" position,
the EPS warning light comes on to indicate that the power assistance for the steering is not func-
tioning.
• If the steering usage is too heavy (i.e., excessive steering use when the vehicle is traveling at a
slow speed), the power assist is reduced to protect the EPS motor from overheating.
• The EPS warning light comes on when the
main switch is turned to "ON", and then
goes off once the engine is started. If the
warning light remains on or comes on after
1
the engine is started, the EPS system may
be defective.
• The electrical circuit of the warning light can
be checked by turning the main switch to
"ON". If the warning light does not come on,
the electrical circuit may be defective.
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