MX-5 Miata L4-2.0L (2008)
Electronic Throttle Actuator: Component Tests and General Diagnostics
Electronic Throttle Control System Inspection
Engine coolant temperature compensation inspection
1. Connect the WDS or equivalent to the DLC-2.
2. Access the following PIDs:
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ECT
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IAT
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RPM
3. Verify that the engine is cold, 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, inspect the following:
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ECT sensor and related wiring harness.
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Electronic throttle body and related wiring harness.
Load compensation inspection
1. Start the engine and idle it.
2. Connect the WDS or equivalent to the DLC-2.
3. Verify that P0506, P0507, or P0511 is not displayed.
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If P0506, P0507 or P0511 are displayed, perform DTC inspection. (See DTC TABLE [LF].) See: Testing and Inspection/Diagnostic Trouble
Code Descriptions
4. Access the RPM PID.
NOTE: Excludes temporary idle speed drop just after the loads are turned on.
5. Verify that the engine speed is within the specification under each toad condition. (See Engine TUNE-UP [LF].)
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If load condition is not as specified, inspect the following:
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A/C switch and related wiring harness (See CLIMATE CONTROL UNIT INSPECTION.)
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Fan switch and related wiring harness (See CLIMATE CONTROL UNIT INSPECTION.)
