Sensor (1) coolant temperature in a four-cylinder engine is located at the rear of the cylinder head. You will find the designation of the sensor contacts on the connector. 2 - plug of the second temperature sensor (air conditioner).
In a six-cylinder engine, the sensor (2) coolant temperature gauge is screwed into the coolant pipe behind the right cylinder head. connector (1) the sensor has been removed.
Coolant level indicator sensor (2) installed at the bottom of the expansion tank (1) coolant.
The coolant temperature indicator functions in the same way as the fuel tank indicator. The device receives current from the plus when the ignition is on, the connection to ground is provided by the temperature sensor on the engine. This sensor is a variable resistance that allows more current to flow as it heats up, so more current is applied to the tool and the pointer deflects further. Two different temperature sensors are combined in one housing. First, the injection coolant temperature sensor (pins 1 and 3) and secondly, the sensor referred to here (pins 2 and 4).
Tip: If the coolant temperature is too high, a flashing red warning light also comes on. This light is controlled by the combined instrument panel's microprocessor. The light also flashes when the coolant level drops. In cars with autocontrol system, a red symbol appears instead of a lamp «Kuhlmittel» – «Coolant».
Violations at work
Incorrect indications of the indicator of temperature of a cooling liquid (most often with simultaneously inaccurate readings of the amount of fuel) make it possible to conclude that there is a malfunction of the microprocessor in the combined instrument panel.
The lack of indication may be due to a malfunction of the temperature sensor or the device.
If the indication is correct and the alarm signal is flashing at the same time, the cause of the malfunction may also be in the coolant level indicator sensor in the expansion tank.
Checking the coolant temperature indicator
1. Disconnect the multi-pin connector on the temperature sensor in the engine compartment.
2. Single contact to temperature sensor (blue/brown wire) on pin 2 of the multi-pin connector, extend with a piece of wire and attach to bare metal (weight). The designation of the contacts is on the connector.
3. Turn on the ignition briefly.
4. If the arrow of the indicator, which has not been moving before, slowly moves along the scale and the control lamp flashes, then the temperature sensor was faulty - replace it.
5. If the indicator needle remains motionless, then the defect is in the supply wire, in the microprocessor or in the indicator device itself. Its dismantling is written at the beginning of the chapter.
Visitor comments