P0095 IAT Sensor 2 Circuit Malfunction

OBD-II DTC Datasheet

Intake Air Temperature Sensor 2 Circuit Malfunction

What does this mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles. Although general, specific repair steps may differ depending on the brand / model.

The IAT (Intake Air Temperature) sensor is a thermistor, which basically means that it measures the temperature of the air by detecting the resistance in the air. It is usually located somewhere in the intake air duct, but in some cases it can be located in the intake manifold as well. Typically this is a 5-wire sensor equipped with a XNUMXV reference wire (which also acts as a signal wire) from the PCM (Powertrain Control Module) and a ground wire.

As air passes over the sensor, the resistance changes. This change in resistance accordingly affects the 5 volts applied to the sensor. Colder air causes higher resistance and higher signal voltage, while warmer air causes lower resistance and lower signal voltage. The PCM monitors this 5 volt change and calculates the air temperature. If the PCM detects voltage outside the normal operating range for sensor #2, P0095 will set.

symptoms

There may be no other noticeable symptoms other than the MIL (Malfunction Indicator) illuminated. However, there may be complaints about poor handling.

reasons

Possible causes of DTC P0095:

IAT sensor biased out of airflow
Bad IAT sensor # 2
Short circuit on weight or open in the signal circuit to IAT
Open in the ground circuit on the IAT
Bad connection in the IAT (tipped terminals, broken connector locks, etc.)
Bad PCM

Possible solutions

First, visually check that the IAT is in place and not misaligned. For a quick IAT check, use a scan tool and check the IAT reading with KOEO (Engine OFF Key). If the engine is cold, the IAT reading should match the coolant temperature sensor (CTS). If it shows a deviation of more than a few degrees (for example, if it indicates an extreme temperature such as negative 40 degrees or 300 degrees, then there is obviously a problem), disconnect the IAT and perform a resistance test on the two terminals.

Each sensor will have a different resistance, so you will have to glean this information from the repair manual. If the resistance of the IAT sensor is out of specification, replace the sensor. There should be some resistance, so if it measures infinite resistance, replace the sensor.

Having said that, here's some more diagnostic information in case that doesn't help:

1. If your KOEO IAT reading is at a very high level, eg 300 deg. (which is clearly inaccurate), disable the IAT sensor. If the reading now shows the lowest limit (-50 or so), replace the IAT sensor. However, if the reading does not change when the IAT is turned off, switch off the ignition and disconnect the PCM connector. Use a voltmeter to check the continuity between a good ground and the signal wire to the IAT. If open, repair the signal wire for a short to ground. If there is no continuity, then there may be a problem in the PCM.

2. If your KOEO IAT value is at the low limit, disconnect the IAT connector again. Make sure the signal is 5 volts, and the second is to ground.

but. If you have 5 volts and a good ground, connect the two terminals with a jumper. The scanner reading should now be at a very high level. If so, replace the IAT sensor. But if it stays low even after you connect the two wires together, there may be a break in the wire harness or a problem with the PCM.

b. If you don't have 5 volts, check the reference voltage at the PCM connector. If present but not on the IAT sensor, repair open in the signal wire.

Other IAT Sensor and Circuit Fault Codes: P0096, P0097, P0098, P0099, P0110, P0111, P0112, P0113, P0114, P0127

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