Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLVO2004V70 L5-2.5L TURBO VIN 59 B5254T2REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSENSORS AND SWITCHES - COMPUTERS AND CONTROL SYSTEMSAIR TEMPERATURE SENSOR ( AMBIENT / INTAKE )DESCRIPTION AND OPERATIONTEMPERATURE SENSOR, INTAKE (TURBOCHARGED ENGINES)
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2
Temperature Sensor, Intake (Turbocharged Engines)
2004 Volvo V70 L5-2.5L Turbo VIN 59 B5254T2SECTION Temperature Sensor, Intake (Turbocharged Engines)
Temperature Sensor, Intake (Turbocharged Engines Only, 2002-2004)
On naturally aspirated engines, the intake air temperature sensor is integrated in the mass air flow (MAF) sensor. On model year 2002 turbocharged engines, the temperature sensor is a stand-alone component. On turbocharged engines from model year 2003, the temperature sensor is integrated in the intake air pressure sensor.
The temperature sensor detects the temperature of the intake air after the charge air cooler (CAC). This data is used by the engine control module (ECM) to calculate the boost pressure control (turbocharger (TC) and to calculate the injection period. The control module also controls certain diagnostic functions using the signal from the temperature sensor.
The sensor, which is an NTC resistor, is grounded in the control module and supplied with power (signal) from the control module.
The resistance in the sensor changes according to the temperature of the intake air. This provides the control module with a signal of between 0 - 5 V. The lower the temperature the higher the voltage (high resistance). A high temperature results in low voltage (low resistance).
The temperature sensor is between the air cleaner (ACL) housing and the intake manifold (does not apply to turbocharged engines 2003-). The temperature sensor on turbocharged engines 2003- is integrated in the intake air pressure sensor.
The Engine Control Module (ECM) can diagnose the temperature sensor. The sensor signal can be read using VADIS/VIDA.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.