ELECTRONIC THROTTLE CONTROL SYSTEM INSPECTION
Engine Coolant Temperature Compensation Inspection
1. Connect the M-MDS 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
(See
ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [LF]
.)
Electronic throttle body and related wiring harness
(See
THROTTLE BODY INSPECTION [LF]
.)
Load Compensation Inspection
1. Start the engine and idle it.
2. Connect the M-MDS 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]
.)
4. Access the RPM PID.
5. Verify that the engine speed is within the specification under each load 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
NOTE:
Excludes temporary idle speed drop just after the loads are turned
on.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:11 PM
Page 131
© 2005 Mitchell Repair Information Company, LLC.