MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Idle Speed: Testing and Inspection
Idle Air Control Inspection
Idle Air Control (IAC) Inspection
Engine coolant temperature compensation inspection
1. Connect the WDS or equivalent to DLC-2.
2. Select following PIDs.
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ECT
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RPM
3. Verify that the engine is in cold condition, then start the engine.
4. Verify that the engine speed decreases as the engine warms up.
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If the engine speed does not decrease or decreases slowly, carry out the following:
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ECT sensor inspection
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IAC valve inspection
Load compensation inspection
1. Warm up the engine to normal operating temperature and idle it.
2. Connect the WDS or equivalent to DLC-2.
3. Select the following PID.
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RPM
4. Turn the electrical loads on and verify that the engine speed is within the specification.
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If not as specified, carry out the following:
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Headlight switch inspection
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A/C switch inspection
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P/S pressure switch inspection
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IAC valve inspection
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Fan switch inspection
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Cooling fan motor inspection
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Rear window defroster inspection
