Engine Control System; Caution / Diagnostic System - Suzuki DF 40 Service Manual

18 DF40QH / DF50QH

ENGINE CONTROL SYSTEM

The engine control systems such as ignition and fuel injec-
tion are basically the same as DF40/50T model specification
except for the following:

Caution / Diagnostic System

Caution and Diagnostic system operator alert signals are audio
only on QH models. Alerts will be signaled by a sound se-
quence from the caution buzzer contained in the tiller handle.
When any caution system is activated, the diagnostic code
buzzer sound sequence for that caution will be the same as
that of a T- specification model.
Refer to the illustration for the QH model buzzer sound se-
quence (ON/OFF pattern) of caution and diagnostic signals.
NOTE:
The buzzer cancellation feature found on T-specification Mod-
els is not available on QH models. Due to this features re-
moval, the ignition switch and the function of the orange lead
extending from ECM to the ignition switch is different between
T and QH specifications.
Buzzer ON/OFF pattern
A. Caution signal
ON
OFF
1.5 sec. 7 sec. 1.5 sec. 7 sec.
B. Diagnostic signals
[EX] : Code 2–3
• When engine is at stop and Ign. Key is turned ON
1.3 sec. 1.3 sec.
ON
OFF
0.2 sec. 3 sec. 0.2 sec.
• During engine operation
4.8 sec. 4.8 sec.
ON
OFF
0.2 sec. 0.2 sec.
QH models
O
Gr
Gr
from ECM
O
Gr
T models
B
G
W
Gr
from ECM
Br
O O
Ignition switch
5 sec.
B
G
W
Gr
Br
Ignition switch