Nissan Maxima Service and Repair Manual: P0112, P0113 IAT sensor

Description

The intake air temperature sensor is built-into the mass air flow sensor (1). The sensor detects intake air temperature and transmits a signal to the ECM.

The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the rise in temperature.

<Reference data>

Nissan Maxima. Reference data

Nissan Maxima. Reference data

*: These data are reference values and are measured between ECM terminals 50 (Intake air temperature sensor) and 56 (Sensor ground).

DTC Logic

DTC DETECTION LOGIC

Nissan Maxima. DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.

2.PERFORM DTC CONFIRMATION PROCEDURE

  1. Turn ignition switch ON and wait at least 5 seconds.
  2. Check 1st trip DTC.

Diagnosis Procedure

Regarding Wiring Diagram information

1.CHECK GROUND CONNECTION

  1. Turn ignition switch OFF.
  2. Check ground connection E9.

2.CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

Nissan Maxima. CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

  1. Disconnect mass air flow sensor (with intake air temperature sensor) harness connector.
  2. Turn ignition switch ON.
  3. Check the voltage between mass air flow sensor harness connector and ground.

Nissan Maxima. CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

3.CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check harness continuity between mass air flow sensor harness connector and ECM harness connector
  4. Also check harness for short to ground and short to power.

Nissan Maxima. CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

4.CHECK INTAKE AIR TEMPERATURE SENSOR

5.CHECK INTERMITTENT INCIDENT

Component Inspection

1.CHECK INTAKE AIR TEMPERATURE SENSOR

Nissan Maxima. CHECK INTAKE AIR TEMPERATURE SENSOR

  1. Turn ignition switch OFF.
  2. Disconnect mass air flow sensor harness connector.
  3. Check resistance between mass air flow sensor terminals as per the following.
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