Suzuki DF150 Service Manual page 133

3-74 ENGINE CONTROL SYSTEM
CHART 7: SELF-DIAGNOSTIC CODE "2-2" Air intake system
START
<Ignition switch "ON">
Check throttle position sensor output
voltage change.
Is result OK? (See page 3-59.)
YES
<Ignition switch "OFF">
• Check MAP sensor, IAC valve for air
leakage.
• Check intake manifold for air leakage.
Is result OK?
NO
Possible cause:
• ECM failure
CHART 8: SELF-DIAGNOSTIC CODE "3-2" MAP sensor 2
START
<Ignition switch "ON">
Check MAP sensor output voltage change.
Is result OK? (See page 3-58.)
YES
Possible cause:
• Clogged pressure detect passage
CHART 9: SELF-DIAGNOSTIC CODE "1-5" Ex. mani. temp. sensor
START
<Ignition switch "OFF">
Check Ex. manifold temp. sensor
resistance.
Is result OK? (See page 3-51.)
YES
Possible cause:
• ECM failure
• Wire continuity/connection failure
NO
Throttle position sensor failure
YES
Air intake system failure
NO
• MAP sensor failure
• ECM failure
• Wire continuity/connection failure
NO
Ex. manifold temp. sensor failure