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Home >> Mazda >> 2007 >> MX-5 Miata L4-2.0L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Electronic Throttle Control System Inspection
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Electronic Throttle Control System Inspection

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:
- ECT
- IAT
- RPM

3. Verify that the engine is cold, then start the engine.
4. Verify that the engine speed decreases as the engine warms up.
- If the engine speed does not decrease or decreases slowly, inspect the following:
- ECT sensor and related wiring harness.
- 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.
- If P0506, P0507 or P0511 are displayed, perform DTC inspection. (See DTC TABLE [LF].) 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].)
- If load condition is not as specified, inspect the following:
- A/C switch and related wiring harness (See CLIMATE CONTROL UNIT INSPECTION.)
- Fan switch and related wiring harness (See CLIMATE CONTROL UNIT INSPECTION.)
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