Sym MAXSYM 400i Service Manual page 67

4. Fuel Injection System
ISC (stepper motor)： ： ： ：
ISCBP ISCBN
ISCAP ISCAN
ISC PINS
phase
A measurement of the
resistance value
measurement of the
B phase
resistance value
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To this chapter contents
Functional Description:
Use ECU provided power, has the four-pin socket.
●
4-pin coupler for the two motor coils of the power supply and
●
grounding wire, grounding ECU power through the control and
management of the stepper motor actuators.
If it's mainly low-power DC motors, drives idle speed control valve
●
(ISC) of the movement to adjust the idle air flow channel size, control
of idle speed of the engine in the cold or hot.
Testing Procedures 1:
Resistance Confirmation:
Idle Air Control Valve will be demolished down coupler (directly in the
●
body, can also measure).
Use of the "meter" Ohm stalls ( ), measurement of the two step
●
motor coil resistance values.
A phase: ISCAP and ISCAN
B phase: ISCBP and ISCBN
Inspection of the actuation (testing can only be on engine, not a single
test):
Closure of the main switch.
●
Use hand to touch Idle Air Control Valve body.
●
Open the main switch.
●
Feeling the Idle Air Control Valve Actuation.
●
Cautions
Dynamic checking for Idle Air Control valve, can only be tested on
●
the engine, not a single test.
Detection judge:
1. Resistance value:
A phase: 80 ± 10 (Environmental conditions: 15 ~ 25
(Environmental conditions: 15 ~ 25 ℃)
B phase: 80 ± 10
2. Actuator inspection:
In the above steps Idle Air Control Valve (ISC) Idling motor actuator
control of inspection, ISC will be slightly vibration or "... da... da..."
continuous sound.
Treatment of abnormal phenomena:
Idle air control valve damage, or poor coupler contact.
●
Check whether the abnormal wire harness lines.
●
Idle Air Control Valve anomaly, the proposed replacement of the Idle
●
Air Control Valve, further inspection of its actuator.
℃
)