Suzuki DF 40 - Page 97

ENGINE CONTROL SYSTEM 3-42
CHART3 : SELF-DIAGNOSTIC CODE “3-1”
START
< Ignition switch “OFF” >
Check IAC valve resistance.
Is result OK? (See page 3-35.)
< Ignition switch “ON” >
Check “B4” terminal voltage.
Is result OK? (See page 3-33.)
Possible cause :
• Incorrect by-pass air screw adjustment
• IAC valve failure (mechanical)
• IAC passage failure (clogged hose/silencer,
etc.)
• ECM failure
• Wire continuity/connection failure
YES
YES
IAC valve failure
NO
ECM failure
NO
CHART4 : SELF-DIAGNOSTIC CODE “2-4”
START
< Ignition switch “ON”, cranking >
Check CMP sensor signal.
Is result OK? (See page 3-38.)
Possible cause :
• ECM failure
• Wire continuity/connection failure
YES
CMP sensor failure
NO
NOTE:
It will be possible to start engine if CMP sensor has failed.
CHART5 : SELF-DIAGNOSTIC CODE “2-2”
START
< Ignition switch “ON” >
Check “D8” terminal voltage.
Is result OK? (See page 3-34.)
Possible cause :
• ECM failure
• Wire continuity/connection failure
YES
CTP switch failure
NO
NOTE1:
In this case, CTP switch will be in “always ON” condition.
(“D8” terminal voltage will be 0V always regardless throttle
position.)
[NOTE1]