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 decreases 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 )
- If the engine speed does not decrease or decreases slowly, inspect the following.