Checking the Temperature Sensor
Remove the plug from the desired sensor. The location of the sensors is shown below.
Connect an ohmmeter to the sensor terminals.
Measure the resistance and compare it with the technical data. Depending on the temperature, intermediate values can be obtained:
- -10°: 8.2-10.5 ohm;
- +20°С: 3.3-2.7 Ohm;
- +80°: 0.3-0.36 ohm.
If the resistance is different from the required, then you need to remove the sensor.
Hang the sensor by the hexagon on a wire in a container with water so that it does not touch the walls of the container. Cool the water by tossing ice cubes into it, and then heat the water in a container on the stove. Remove the sensor at the desired temperature and measure the resistance between the contacts. If it differs from the required, replace the sensor.
If the temperature sensor is OK, connect a voltmeter between the temperature sensor plug and ground.
Turn on the ignition. The required voltage value is about 5 V. If there is no voltage, check the integrity of the wire.
If there is voltage, check the ground wire for continuity.
If the sensor wires are in order, then you need to look for a malfunction elsewhere, for example, in the control unit.
Removing the temperature sensor
To prevent coolant from leaking out when removing the sensor, it is better to partially drain it in advance.
Remove the cover (casing) engine from the intake manifold and disconnect the crankcase ventilation connection from the valve cover.
The coolant temperature sensor is located under the intake manifold at the front of the cylinder block.
Remove the plug and unscrew the sensor. The sensor contains devices for the DME and for the temperature gauge.
Installation
Screw in the sensor with a new O-ring and tighten it to 20 Nm.
Put on the plug and secure it by snapping the wire.
Attach the crankcase ventilation hose to the cylinder head, install the engine cover.
Fill with coolant and bleed air from the cooling system.
Take a test drive and check the tightness of the sensor connection, if necessary tighten it a little.
Interrogate the memory of the DME unit. After troubleshooting, clear the trouble codes.
Removing the intake air temperature sensor
Loosen the bolts and remove the throttle body.
Attention: cable «gas» and coolant hoses for throttle body heating remain connected.
Press the tab on the temperature sensor to pull it out of the intake manifold. Remove the plug.
Installation
Insert temperature sensor.
Put on the plug - the wire lock should click into place.
Install the throttle body.
Put on the air supply hose and secure it with a clamp.
Interrogate the memory of the DME unit. After troubleshooting, erase their codes from memory.