Suzuki DF70A Service Manual

Fuel System: 1G-10
Idle Air Control System Outline
The ECM controls the position of the IAC valve to regulate a portion of the intake air flow to the intake manifold.
This system is used for the following purposes:
• To keep idling / trolling at the specified speed.
• To improve drivability when decelerating. (dash-pot effect)
• To improve engine starting and warm-up performance. (fast-idle function)
The sensors and switch shown below monitor the current engine condition and send signals to the ECM.
Based on these signals, the ECM determines the IAC valve setting necessary to achieve the target engine speed and
outputs the signal for actuating the stepper motor inside the IAC valve.
The rotor of the stepper motor then turns in an amount equal to the steps of the signal supplied from the ECM, moving
the valve via a screw shaft.
ECM
60 IAC1
70 IAC2
58 IAC3
48 IAC4
Air flow
IAC valve
+12 V
Gr
W/B
R/Y
R/G
W/Bl
1
2
3
4
I9J011170010-02
1. Valve pintle 2. Screw shaft 3. Rotor 4. Coil
CKP sensor:
Informs ECM of engine speed.
MAP sensor:
Informs ECM of intake manifold pressure.
TPS:
Informs ECM of throttle opening angle.
Cylinder temp. sensor:
Informs ECM of cylinder temperature.
IAT sensor:
Informs ECM of intake air temperature.
ECM
Shift position sensor:
Informs ECM of shift position and change.
Signal
IAC valve
I9J011170011-03
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Suzuki DF70A Specifications

General

Engine Type	4-Stroke DOHC 16-Valve
Starting System	Electric
Steering	Remote
Number of Cylinders	4
Maximum Output	70 HP
Alternator	12V 27A
Trim Method	Power Trim and Tilt
Gear Ratio	2.59:1
Exhaust	Through Prop Hub Exhaust
Max Output	70 hp
Ignition System	Fully transistorized ignition
Fuel Tank Capacity	External
Weight	160 kg
Full Throttle Operating Range	5, 300 - 6, 300 rpm
Fuel Type	Unleaded Gasoline
Shaft Length	L: 508 mm, X: 635 mm
Displacement	1, 502 cc
Fuel Delivery System	Multi-point sequential electronic fuel injection
Oil Capacity	4.0 L
Alternator Output	27A