3-46 ENGINE CONTROL SYSTEM
CHART3: SELF-DIAGNOSTIC CODE “3-1”
START
< Ignition switch “OFF” >
Check IAC valve resistance.
Is result OK? (See page 3-39.)
< Ignition switch “ON” >
Check “18” terminal voltage.
Is result OK? (See page 3-38.)
Possible cause:
• Incorrect by-pass air screw adjustment
• IAC valve failure (mechanical)
• IAC passage failure (clogged hose, 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 resistance.
Is result OK? (See page 3-39.)
Possible cause:
• ECM failure
• Wire continuity/connection failure
YES
CMP sensor failure
NO
NOTE:
It will be possible to start the engine if the CMP sensor has
failed.
CHART5: SELF-DIAGNOSTIC CODE “2-2”
START
< Ignition switch “ON” >
Check “24” terminal voltage.
Is result OK? (See page 3-38.)
Possible cause:
• ECM failure
• Wire continuity/connection failure
YES
CTP switch failure
NO
NOTE1:
In this case, the CTP switch will be in “always ON” condi-
tion. (“24” terminal voltage will be 0 V always regardless
throttle position.)
[NOTE1]
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