DTC detecting condition | Trouble area |
---|---|
IAC control duty pulse is not detected in its monitor signal.
(2 driving cycle detection logic) |
•
Idle air control valve and/or its circuit
• ECM |
Step | Action | YES | NO |
---|---|---|---|
1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
2 |
Idle speed check
1)
Check idle speed/idle air control duty referring to
Idle Speed / Idle Air Control (IAC) Duty Inspection:M13A with VVT
.
Is check result as specified?
|
Go to Step 3.
|
Go to Step 4.
|
3 |
Idle air control valve operation check
1)
Check idle air control valve for operation referring to
Idle Air Control (IAC) Valve On-Vehicle Inspection:M13A
.
Is check result as specified?
|
Intermittent trouble. Check for intermittent referring to
Intermittent and Poor Connection Inspection
. If OK, substitute a known-good ECM and recheck.
|
Go to Step 4.
|
4 |
Idle air control valve circuit check
1)
Disconnect connector from idle air control valve with ignition switch turned OFF.
2)
Turn ON ignition switch, measure voltage between “BLU/BLK” wire terminal of idle air control valve connector and engine ground.
Is voltage 10 – 14 V?
|
Go to Step 5.
|
“BLU/BLK” wire in open or high resistance circuit.
|
5 |
Idle air control valve circuit check
1)
Disconnect connectors from ECM with ignition switch turned OFF.
2)
Measure resistance between “GRN/YEL” wire terminal of idle air control valve connector and “E117-8” terminal of ECM connector.
Is resistance 2 Ω or less?
|
Go to Step 6.
|
“GRN/YEL” wire in open or high resistance circuit.
|
6 |
Idle air control valve circuit check
1)
Measure resistance between each “E117-8” terminal of ECM connector and vehicle body ground.
Is resistance infinite?
|
Go to Step 7.
|
“GRN/YEL” wire in shorted to ground circuit.
|
7 |
Idle air control valve circuit check
1)
Connect connectors to ECM.
2)
Turn ON ignition switch, measure voltage between “E117-8” terminal of ECM connector and vehicle body ground.
Is each voltage 0 V?
|
Go to Step 8.
|
“GRN/YEL” wire in shorted to power circuit.
|
8 |
Idle air control valve circuit check
1)
Measure resistance between “BLK” wire terminal of IAC valve connector and vehicle body ground with ignition switch turned OFF.
Is resistance continuity?
|
Go to Step 9.
|
“BLK” wire in open circuit.
|
9 |
Idle air control valve circuit check
1)
Disconnect connectors from ECM.
2)
Connect connector to IAC valve.
3)
Using service wire, ground “E117-15” terminal of ECM connector because of main relay turned ON.
4)
Measure voltage between “E117-8” terminal of ECM connector and vehicle body ground with ignition switch turned ON.
Is voltage 10 – 14 V?
|
Substitute a known-good ECM and recheck.
|
Replace IAC valve.
|