Engine coolant temperature sensor and module

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Engine Coolant Temperature (ECT) sensor



The ECT sensor is designed as an NTC resistor and is used to measure the exact ECT.
The PCM uses the signal from the ECT sensor to correct the following values:
  • Determination of injection duration
  • Engine idle speed
  • Control of cooling fan
  • Control of A/C compressor
A voltage of 5V is applied to the ECT sensor by the PCM. The PCM is able to determine the coolant temperature from the temperature-dependent voltage drop at the sensor.
If the signal from the ECT sensor fails, the cooling fan is on all the time and the A/C is turned off. When the ignition is switched on, the value from the IAT sensor is read. When the engine is running, the temperature is calculated using a temperature map stored in the PCM according to how long the engine has been running. This substitute value is then used as the basis for calculating the injected fuel quantity and the ignition timing.

Evaporative emission canister purge valve


The EVAP purge valve is only actuated by the PCM if the coolant temperature is at least 60°C. In that case the EVAP purge valve is opened and the vacuum in the intake manifold sucks ambient air through the activated charcoal in the evaporative emission canister. In this way the adsorbed hydrocarbons are led to the combustion chamber of the engine.
The EVAP purge valve is deactivated and purging of the system is halted as soon as the engine management system goes into idling and/or fuel adjustment mode.

Cooling fan module



The cooling fan module is directly supplied with battery power via a 60A fuse in the BJB. It is actuated via a PWM signal from the PCM depending on the operating state of the engine and the air-conditioning system.
The speed of the cooling fan motor is controlled according to this signal.



 
Power Steering Pressure (PSP) switch



The PSP switch registers pressure in the line between the power steering pump and the steering gear. When a predefined pressure is reached, the switch is opened, thereby allowing the PCM to stabilize the idle speed in good time.
If the PSP switch fails, this can lead to idling fluctuations which could cause the engine to stall in case of large steering deflections (when parking).

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