General information
The intake air temperature sensor is located on the intake manifold. The sensor is a resistor that changes the signal voltage depending on the temperature of the air entering the intake manifold. In accordance with the signal from the intake air temperature sensor, the electronic engine control unit will adjust the required fuel supply (basic fuel injector open time). When the air temperature is low, the fuel supply will increase.
- Intake air temperature sensor resistance (at 20°С): 2.33-2.97 kOhm
Troubleshooting Guide
Under the following conditions, the engine malfunction indicator lights up "CHECK ENGINE", and the corresponding fault code is displayed on the tester:
- 1. If the intake air temperature detected by the sensor is below -40°C or above 120°C.
- 2. If the input signal from the intake air temperature sensor is below 0.1V or above 4.8V when the engine is fully warmed up.
Sensor test
1. Using a multimeter, measure the resistance between the terminals "1" And "2" intake air temperature sensor connector (two-pin connector).
Table. Rated values.
Air temperature | Rated value |
At 0°C | 3.3-3.7 ohm |
At 20°C | 2.4-2.8 ohm |
At 40°C | 1.6-2.0 ohm |
At 80°C | 0.5-0.9 ohm |
2. Using a multimeter, measure the voltage between the terminals "1" And "2" intake air temperature sensor connector (two-pin connector), when the ignition key is in position "ON" (ON).
- A) Check that the voltage is approximately 4.30 V at an intake manifold air temperature of 0°C.
- b) Check that the voltage is approximately 3.44V at an intake manifold air temperature of 20°C.
2. If the measured resistance or voltage is out of specification, replace the intake air temperature sensor.
Testing with a tester
1. Conditions for the audit.
Ignition key: in position "ON" (ON) or the engine is running.
2. Performing a check:
Read tester readings (Air temperature in the intake manifold).
Table. Rated values.
Engine condition | Rated value |
At -20°С | -20°С |
At 0°C | 0°C |
At 20°C | 20°C |
At 40°C | 40°С |
At 80°C | 80°С |