4. Fuel Injection System
4-24
ISC (stepper motor)：
ISC PINS
A phase measurement of the
resistance value
B phase
measurement of the
resistance value
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 (Ω), 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 ± 10Ω (Environmental conditions: 15 ~ 25 ℃)
B phase: 80 ± 10Ω (Environmental conditions: 15 ~ 25 ℃)
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.
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