Engine Coolant Temperature Compensation Inspection

WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Connect the WDS or equivalent to the DLC-2.
Select the PID/DATA MONITOR AND RECORD function on the WDS or equivalent display.
Select the following PIDs.
- ECT
- IAT
- RPM
Verify that the engine is in cold condition, then start the engine.
Verify that the engine speed decreases as the engine warm-up.
- If the engine speed does not decrease or decreases slowly, inspect the following:
  - ECT sensor and related harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .)
  - Throttle body and related harness (See THROTTLE ACTUATOR INSPECTION .) (See THROTTLE POSITION (TP) SENSOR INSPECTION .)