Engine coolant temperature compensation Inspection

Connect the SSTs (WDS or equivalent) to DLC-2.
Select the PID/DATA MONITOR AND RECORD function on the WDS or equivalent display.
Select the following PIDs.
- ECT
- RPM
Verify that the engine is in cold condition, then start the engine.
Verify that the engine speed decreases as the engine warms up.
- If the engine speed does not decrease or decrease slowly, inspect the following.
  - ECT sensor and related harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .)
  - IAC valve and related harness (See IDLE AIR CONTROL (IAC) VALVE INSPECTION .)