Coolant Temperature Sensor (Cts)
The coolant temperature sensor is installed in the engine water jacket on the left side of the engine. See Fig 1 . It provides an input voltage to the ECU. As coolant temperatures vary, the Coolant Temperature Sensor resistance changes, resulting in a different input voltage to the ECU. The ECU calculates this information and adjusts the following:
- Adjust fuel injector pulse width. Colder coolant temperatures will result in longer injector pulse width and richer air-fuel mixtures.
- Compensate for fuel condensation in the intake manifold.
- Control engine warm-up idle speed.
- Increase ignition advance when the coolant is cold.
- Energize the EGR valve solenoid, thus preventing the flow of vacuum to the EGR valve.