Contents: General information ⇓ Troubleshooting Guide ⇓ Checking the sensor ⇓ Checking with a tester ⇓
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 open time of the fuel injector). At low air temperatures, the fuel supply will increase.
- Resistance of the intake air temperature sensor (at 20°C): 2.33-2.97 kOhm
Troubleshooting Guide
Under the following conditions, the "CHECK ENGINE" indicator light comes on and the tester displays the corresponding fault code:
- 1. If the intake air temperature recorded by the sensor is below -40°C or above 120°C.
- 2. If the input signal from the intake air temperature sensor is below 0.1 V or above 4.8 V when the engine is fully warmed up.
Checking the sensor
1. Using a multimeter, measure the resistance between terminals "1" and "2" of the intake air temperature sensor connector (two-pin connector).
Table. Nominal values.
| Air temperature | Nominal 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 terminals "1" and "2" of the intake air temperature sensor connector (two-pin connector) when the ignition switch is in the "ON" position.
- 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 3.44 V at an intake manifold air temperature of 20°C.
2. If the measured resistance or voltage differs from the nominal values, replace the intake air temperature sensor.
Checking with a tester
1. Conditions for conducting the inspection.
Ignition switch: in the "ON" position or the engine is running.
2. Performing the check:
Read the tester readings (Intake Manifold Air Temperature).
Table. Nominal values.
| Engine condition | Nominal value |
| At -20°C | -20°C |
| At 0°C | 0°C |
| At 20°C | 20°C |
| At 40°C | 40°C |
| At 80°C | 80°C |
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