California Air Tools 3010 Service Manual download pdf (Page 371)

STEERING 15-23

EPS (Electric Power Steering) System

If due to a malfunction, the EPS warning indicator light

(LED) remains lit, try to understand the background of the

trouble before starting the repair work. First ask the rider

about the conditions [A] of the trouble, and then start to ex-

amine the cause [B] of the trouble. Do not rely solely on the

self-diagnosis function, use common sense; for example,

check the connections of the connector.

If the problem is with the following parts, the EPS ECU

can not recognize these problem. Therefore, EPS warning

indicator light (LED) does not light up, and service code is

not indicated.

EPS Warning Indicator Light (LED)

EPS ECU Power Source Wiring and Ground Wiring

Speed Sensor

When the repair has been done, the EPS warning indica-

tor light (LED) lights up immediately after main switch ON,

and goes off after 1 second. This shows that EPS system is

normal. But, service codes detected once by the EPS ECU

will be memorized in the EPS ECU. Therefore, after main-

tenance work ends, be sure to erase the service codes with

service code erase mode. Do not erase the service codes

during troubleshooting. Wait until all the checks and repair

work are finished to prevent duplication of previous service

codes and unnecessary maintenance work. Before eras-

ing the service codes, record them as problem history. The

problem history can be referred when solving unstable trou-

ble.

Even when the EPS system is operating normally, the

EPS warning indicator light (LED) may light up under strong

electrical interference. If the indicator light lights up, turn the

main switch OFF and then erase the service code.

Much of the EPS system troubleshooting work consists of

confirming continuity of the wiring. The EPS system parts

are assembled and adjusted by the manufacturer, so there

is no need to disassemble or repair them. Replace them as

an assembly.

The basic troubleshooting procedures and precautions

are listed below.

•

Using a fully charged battery. A fully charged battery is a

must for conducting reliable self-diagnosis function.

•

Measure coil winding resistance when the EPS system

part is cold (at room temperature).

•

Check wiring and connections from the EPS ECU con-

nector to the suspected faulty EPS s ystem part, using the

hand tester.

Special Tool - Hand Tester: 57001-1394

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California Air Tools 3010 Service Manual Page 371

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