What is the purpose of the Intake Air Temperature (IAT) sensor and how can it be tested?

The Intake Manifold Temperature Sensor (IAT) sensor, an NTC type sensor, measures incoming air temperature. The Engine Control Module (ECM) uses it to adjust fuel injection and ignition timing. The sensor's location varies with engine type. A BMW service tester or Data Scan Tool (DST) can test the sensor. For engines with a vane type Mass Air Flow (MAF) sensor, the Intake Manifold Temperature Sensor is in the MAF housing. Check for a 5 volt signal between terminal No.1 and ground. If absent, check for an open circuit. Check resistance between terminals Nos. 2 and 3, which should change with temperature. For 1996-98 models, the Intake Manifold Temperature Sensor is separate, located in the intake manifold or upper air filter housing. Check for a 5 volt signal between the reference signal connector and ground. If absent, check for an open circuit. Check resistance between the IAT terminals, which should decrease as air temperature increases. Follow specific procedures to remove and install the sensor.

Genuine BMW Z3 Intake Manifold Temperature Sensor

Air Intake Temperature Sensor

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BMW Z3 Intake Air Temperature Sensor
Part Number: 13621739510
$53.12 MSRP: $58.93
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Product Specifications
- Replaced by: 13629899008
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1996-2002 BMW Z3 | 1.9L Engine(E36), 2.8L Engine(E36), Coupe(E36), Roadster 1.9L(E36), Roadster 2.5L(E36), Roadster 2.8L(E36), Roadster 3.0L(E36), Roadster(E36)

BMW Z3 Intake Manifold Temperature Sensor

The Intake Manifold Temperature Sensor used in BMW Z3 is used to determine the temperatures of the air that is being taken in to the vehicle's engine, thus helping to keep the combustion at optimum levels. This information is then sent to the Powertrain Control Module or PCM that in turn will change the fuel injector timing in a bid to achieve the right air - fuel mixture irrespective of the conditions. Like Intake Manifold Temperature Sensors, there are various kinds of sensors used in the Z3 models, each sensetive to particular air flow levels and using specific fuel injectors. These sensors vary in some of the characteristics and when such changes as performance air intakes or larger throttle bodies are made mistakes can occur that implies the wrong air/fuel mixture ratio. Functional checks, including the permanent monitoring of sensors, and checks on the air intake systems are recommended issues such as stall or poor acceleration may occur, and this can significantly affect the Car's performance.

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BMW Z3 Intake Manifold Temperature Sensor Parts Questions & Experts Answers

Intake Air Temperature Sensor
13-62-1-739-510
Q: What is the purpose of the Intake Air Temperature (IAT) sensor and how can it be tested?
A: The Intake Manifold Temperature Sensor (IAT) sensor, an NTC type sensor, measures incoming air temperature. The Engine Control Module (ECM) uses it to adjust fuel injection and ignition timing. The sensor's location varies with engine type. A BMW service tester or Data Scan Tool (DST) can test the sensor. For engines with a vane type Mass Air Flow (MAF) sensor, the Intake Manifold Temperature Sensor is in the MAF housing. Check for a 5 volt signal between terminal No.1 and ground. If absent, check for an open circuit. Check resistance between terminals Nos. 2 and 3, which should change with temperature. For 1996-98 models, the Intake Manifold Temperature Sensor is separate, located in the intake manifold or upper air filter housing. Check for a 5 volt signal between the reference signal connector and ground. If absent, check for an open circuit. Check resistance between the IAT terminals, which should decrease as air temperature increases. Follow specific procedures to remove and install the sensor.