REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Nissan Maxima QX (1993 release)

general info. full specifications. diagnostics. hints. tips. tricks

Home

Nissan
	Maxima QX
		Introduction
		Operating Instructions
		Adjustment and routine maintenance
		Engine
		System of cooling, heating
		The power supply system and release
		Electric motor
		Engine Control Systems
			general information
			System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions
			Removal and installation RSM
			Check of the state, replacement and adjustment of the throttle position sensor (TPS)
			Check and replacement of the gauge measuring the mass air flow (MAF)
			Check and replacement of the gauge of absolute pressure in the pipeline (MAP)
			Check and replace the intake air temperature sensor (IAT)
			Check and replacement of the gauge engine coolant temperature (ECT)
			Check and replace the crankshaft position sensor (CKP)
			Check and replace the camshaft position sensor (CMP)
			Check and replacement of the gauge-switch of pressure in the system hydrostrengthening wheel (PSP)
			Check and replacement of the oxygen gauge (l-probe)
			Check and replace the knock sensor
			Check and replace the fuel temperature sensor Vehicle speed (VSS)
			Check and replace the vehicle speed sensor (VSS)
			Check and replacement of components of system of stabilization of turns of idling
			The control system functioning valve power
			The system controlled crankcase ventilation (PCV)
			Exhaust gas recirculation (EGR) - the general information, check of a condition and replacement of components
			System of catching of fuel evaporations (EVAP) - the general information, check of a condition and replacement of components
			Catalytic converter - the general information, check of a condition and replacement
		Transmission
		Coupling and power shafts
		Brakes
		Suspension and steering
		Body
		Onboard electric

printable version

Check and replace the intake air temperature sensor (IAT)

IAT sensor is a thermistor (a resistor whose resistance depends on the temperature). The sensor is mounted inside the air inlet duct and serving to detect the temperature of intake air into the engine. The change in resistance results in a change in the amplitude of the signal voltage of the sensor, and the higher the temperature, the lower the resistance, and vice versa. RSM uses the information emitted by the sensor with the fine adjustment of the dosage of the air-fuel mixture. Sensor failure / breach of its electrical circuit leads to record in memory of self-corresponding fault code (see. Section System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions).

CHECK

PERFORMANCE ORDER

Perform the following procedure may result in a memorized OBD fault, which will be displayed control lamp "Check up the engine". Upon completion of inspection and corresponding regenerative repair do not forget to clean the system memory (see. Section System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions).

1. Before you proceed directly to the assessment of the state of the sensor, make sure of serviceability of giving him the power of the PCM and in the absence of evidence of violations of the ground. Disconnect the IAT sensor wiring and connect a voltmeter to the two terminals of the connector from the harness. Turn on the ignition (the engine do not start), - the meter should give an indication of 5.0 V, otherwise check up an electroconducting condition on a chain site between the sensor and the PCM. If the connection is in order, drive to a workshop to diagnose the state of the PCM and perform the proper reconditioning.
2. With the ignition off, disconnect from the IAT sensor wiring and use an ohmmeter to measure the resistance between the two terminals of the sensor connector while the engine is cold. Restore initial connection of electrical wiring, start the engine and warm it up to normal operating temperature. Again disunite connector and repeat the measurement of resistance. Compare the two measurements with the schedule of the temperature dependence of the sensor. Faulty sensor must be replaced.
The thinner the IAT sensor status check can be made out of the car and build a complete graph of the temperature dependence by lowering the heated water on the fire.

REPLACEMENT

PERFORMANCE ORDER

1. Disconnect the IAT sensor wiring.
2. Remove the sensor from the inlet duct (try not to damage the plastic components).
3. Install in the reverse order.

« previos page
Check and replacement of the gauge of absolute pressure in the pipeline (MAP)

next page »
Check and replacement of the gauge engine coolant temperature (ECT)