Engine Coolant Temperature (ECT) Sensor

Coolant temperature sensor is a negative temperature coefficient sensor. Coolant temperature information is used by the MPI ECM as a correction factor for the following:

• Cold start enrichment.
• Correction to injection and ignition timing for cold engine.
• Idle speed control.
• Deceleration fuel shut-off.

Coolant temperature sensor also is used to activate certain systems at a predetermined temperature such as:

• Oxygen sensor control.
• Knock control.
• Exhaust gas recirculation.