Suzuki DF 90 Service Manual page 94

3-46 ENGINE CONTROL SYSTEM
CHART3 : SELF-DIAGNOSTIC CODE "3-1"
START
< Ignition switch "OFF" >
Check IAC valve resistance.
Is result OK? (See page 3-38)
YES
< Ignition switch "ON" >
Check "18" terminal voltage.
Is result OK? (See page 3-37)
YES
Possible cause :
• Incorrect by-pass air screw adjustment
• IAC valve failure (mechanical)
• IAC passage failure (clogged hose, etc.)
• ECM failure
• Wire continuity / connection failure
CHART4 : SELF-DIAGNOSTIC CODE "2-4"
START
< Ignition switch "ON">
Check CMP sensor signal.
Is result OK? (See page 3-42)
YES
Possible cause :
• ECM failure
• Wire continuity / connection failure
CHART5 : SELF-DIAGNOSTIC CODE "2-2"
START
< Ignition switch "ON" >
Check "24" terminal voltage.
Is result OK? (See page 3-37)
YES
Possible cause :
• ECM failure
• Wire continuity / connection failure
NO
IAC valve failure
NO
ECM failure
NO
CMP sensor failure
NOTE:
If there is an open circuit of any of the connector wires, sen-
sor damage or any other malfunction, ignition timing will re-
main fixed at BTDC 5°.
NO
CTP switch failure
NOTE1:
In this case, CTP switch will be in "always ON" condition.
("24" terminal voltage will be 0V always regardless throttle
position.)
[NOTE1]