P0074 Code - Ambient Air Temperature Sensor Circuit Intermittent

What Does Code p0074 Mean?

Abnormal readings detected from ambient air temperature and intake air temperature.

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What are the symptoms of P0074 ?

Typically, a service engine soon lamp will be the only visible symptom of this condition. In some instances, the electronic climate control system will also be disabled.

What are the common causes of P0074 ?

Causes of this code usually include a faulty ambient temperature sensor, disconnected electrical connectors, shorted, open, or corroded electrical circuitry or electrical connectors. Objects or road debris covering the ambient air temperature sensor can also affect input voltage readings.

How do you troubleshoot P0074 ?

Because this DTC refers to a circuit problem, we will need to inspect the AAT sensor, connector, and wiring harness. Usually, a sluggish AAT will not set a DTC, and an open- or short-circuit may set “low-input” or “high-input” DTCs. You can check the AAT sensor with a DVOM (digital volt-ohm meter), thermometer, and a little patience.

Sensor Check – If you note inconsistent resistance readings or corrosion in the connector, replace the sensor. If the sensor is fine, suspect a wiring problem.

• For two-wire sensors, use your DVOM to measure the resistance across the terminals of the AAT sensor. Check the resistance against the current temperature and the resistance chart in the repair manual. Use a hair dryer to increase the temperature of the AAT sensor, while you watch the resistance change. Make sure the resistance change is smooth, with no dropouts.
• For three-wire sensors, you need to check the sensor while connected and with the key in the “on” position. Check for 5 V reference and a good ground, and a variable voltage on the signal wire, which you can check against the temperature/voltage chart. Check your repair manual or electrical wiring diagram for pins and voltages.

Wire Harness and Connector Check

• Check the wire harness for damage. Then, make sure the AAT connector is in good condition, no bent or backed-out pins, corrosion, or signs of water entry. Make sure the AAT connector is firmly seated. Repair as necessary.
• With the key on and AAT connector firmly seated, check for 5 V reference voltage and variable signal voltage. Three-wire AAT sensors also need a good ground, on the third wire. Check your repair manual or electrical wiring diagram for pinout, wire routing, and expected signal. Repair as necessary.

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