Engine coolant temperature compensation inspection

WARNING: This page is about a different car, the 2013 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

Connect the M-MDS to the DLC-2.
Select the following PIDs: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0] ).
- ECT
- IAT
- RPM
Verify that the engine is cold, 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 No.1 and related wiring harness (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ).
  - Throttle body and related wiring harness (See THROTTLE BODY INSPECTION ).

RELATED PIDs DESCRIPTION

Monitor item (Definition)	Unit/Condition	Condition/Specification (Reference)
ECT	°C, °F	Displays the ECT
ECT	V	ECT is 20°C {68°F}: approx. 3.10 V ECT is 40°C {104°F}: approx. 2.16 V ECT is 60°C {140°F}: approx. 1.40 V ECT is 80°C {176°F}: approx. 0.87 V ECT is 100°C {212°F}: approx. 0.54 V
IAT	°C, °F	Displays the IAT (No. 1)
IAT	V	IAT is 20°C {68°F}: approx. 2.64 V IAT is 40°C {104°F}: approx. 1.80 V IAT is 60°C {140°F}: approx. 1.14 V
RPM	RPM	Displays the engine speed