Suzuki DF140WT User Manual

ENGINE CONTROL SYSTEM 3-13
CONTROL MODE
WHEN CRANKING :
The ignition timing is fixed at BTDC 5° until the engine starts.
WHEN IDLING / TROLLING :
The ignition timing is controlled within the range of BTDC 3° to 13° to provide stable engine operation at the
specified idling / trolling speed.
When the shift lever is in neutral, if engine speed exceeds 900 r/min., ignition timing remains fixed at BTDC
8°.
WHEN RUNNING (NORMAL OPERATION) :
The ignition timing ranges between BTDC 1° – 44° (DF90) or BTDC 3° – 44° (DF115), depending on current
engine operating conditions.
WHEN DECELERATING :
When the throttle valve is closed suddenly, turning the CTP switch “ON”, the return of ignition timing to the
closed throttle specification (idle speed) is delayed for a programmed duration to prevent engine stalling or
unstable running.
IGNITION TIMING CHART
The following chart is an example for ignition at BTDC 30°.
SPECIFICATION
Ignition system Full-transistorized ignition
Advance Electronic microcomputer control
Ignition timing DF 90 : BTDC 1° – 44°, DF 115 : BTDC 3° – 44°
Firing order 1 – 3 – 4 – 2
In. Cm. Ep. Ex. In. Cm. Ep. Ex. In.
TDC TDC TDC TDC
TDC TDCTDCTDC
Spark timing
30˚
10˚
120˚ 120˚ 120˚
4-signals/720˚
34-signals/360˚
CKP sensor
signal
CMP sensor
signal
#1 ignition
signal
#3 ignition
signal
#4 ignition
signal
In. : Intake, Cm. : Compression, Ep. : Explosion, Ex. : Exhaust, TDC : Top Dead Center
ON
OFF
Ex. In. Cm. Ep. Ex. In. Cm. Ep. Ex.
TDC TDC TDC TDC
Ep. Ex. In. Cm. Ep. Ex. In. Cm. Ep.
TDC TDC TDC TDC
Cm. Ep. Ex. In. Cm. Ep. Ex. In. Cm.
#2 ignition
signal
30˚

Suzuki DF140WT Specifications

General

Brand	Suzuki
Model	DF140WT
Category	Outboard Motor
Language	English